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Impact of deadwood decomposition on soil organic carbon sequestration in Estonian and Polish forests

Abstract

Key message

The deadwood of different tree species with different decomposition rates affects soil organic carbon sequestration in Estonian and Polish forests. In warmer conditions (Poland), the deadwood decomposition process had a higher rate than in cooler Estonian forests. Soil organic matter fractions analysis can be used to assess the stability and turnover of organic carbon between deadwood and soil in different experimental localities.

Context

Deadwood is an important element of properly functioning forest ecosystem and plays a very important role in the maintenance of biodiversity, soil fertility, and carbon sequestration.

Aims

The main aim was to estimate how decomposition of deadwood of different tree species with different decomposition rates affects soil organic carbon sequestration in Estonian and Polish forests.

Methods

The investigation was carried out in six forests in Poland (51° N) and Estonia (58° N). The study localities differ in their mean annual air temperature (of 2 °C) and the length of the growing season (of 1 month). The deadwood logs of Norway spruce (Picea abies (L.) Karst.), common aspen (Populus tremula L.), and silver birch (Betula pendula Roth) were included in the research. Logs in three stages of decomposition (III–V) were selected for the analysis.

Results

There were differences in the stock of soil organic carbon in two experimental localities. There was a higher soil carbon content under logs and in their direct vicinity in Polish forests compared to those in the cooler climate of Estonia. Considerable differences in the amount of soil organic matter were found. The light fraction constituted the greatest quantitative component of organic matter of soils associated with deadwood.

Conclusion

A higher carbon content in surface soil horizons as an effect of deadwood decomposition was determined for the Polish (temperate) forests. More decomposed deadwood affected soil organic matter stabilization more strongly than less decayed deadwood. This relationship was clearer in Polish forests. Higher temperatures and longer growing periods primarily influenced the increase of soil organic matter free light fraction concentrations directly under and in close proximity to logs of the studied species. The slower release of deadwood decomposition products was noted in Estonian (hemiboreal) forests. The soil organic matter mineral fraction increased under aspen and spruce logs at advanced decomposition in Poland.

Introduction

Deadwood is a ubiquitous element of both protected and managed forest ecosystems (Harmon et al. 1986; Wambsganss et al. 2017). Standing dead trees, logs, snags, and stumps constitute deadwood resources (Harmon and Sexton 1996). Deadwood is an important carbon (C) reservoir in the forest ecosystem. During the decomposition of deadwood, C is partly emitted to the atmosphere and partly stored as C resources in the soil. The main processes involved in the decomposition of deadwood are respiration, transformation, fragmentation, and leaching (Magnússon et al. 2016). Lasota et al. (2017) noted that concentration of cations leached from deadwood increases with the advancement of the decomposition rate. The amount of ions released from deadwood depends on the tree species. Increases in dissolved organic carbon (DOC) derived from decaying wood have been observed (Kahl et al. 2012; Zalamea et al. 2007). Błońska et al. (2017) demonstrated that soil C accumulation and enzyme activity in the soil were influenced by deadwood form, tree species, and decay class. Carbon is stored in the soil mostly as soil organic matter (SOM), and deadwood affects the quality and quantity of SOM (Zalamea et al. 2007). Soil organic matter is heterogeneous, and consists of different fractions that are characterized by different degrees of stability (Von Lützov et al. 2006). The fractionation of SOM allows the separation of groups differing in composition and biological function (Christensen 1992). Density fractionation procedure has identified three SOM fractions. The labile fraction, due to its low density (< 1.7 g cm−3), is also called free light fraction (Tefs and Gleixner 2012). The mineral soil light fraction, however, may become stabilized by occlusion inside aggregates (resulting in the so-called occluded light fraction) (Von Lützov et al. 2006). The stabilized fraction of SOM, also known as the heavy fraction, is the mineral-associated fraction (Grüneberg et al. 2013; Saidy et al. 2012).

It is believed that, among abiotic factors, climatic conditions have the greatest impact on the soil organic matter content. Among the climatic factors, temperature and moisture are the characteristics that most influence the decomposition of soil organic matter (Bani et al. 2018; Błońska and Lasota 2017). Boreal and temperate forests cover 25% of the terrestrial land surface of the Earth. Temperate climates are those occurring between the frigid and tropical zones, having an intermediate long-term average temperature. Temperate regions generally also exhibit strong seasonality in temperature and rainfall. Climatically, the boreal region is the northernmost section of the temperate zone before the arctic begins and is coincident with the limits of continuous forest cover in the northern hemisphere (Thomas and MacLellan 2004). Hemiboreal forests form a transitional zone between boreal and temperate forest biomes and are characterized by mixed forest stands (Shorohova et al. 2009; Krasnova et al. 2019). According to Allison et al. (2009, 2013), temperature could influence decomposition of organic material by changing the activity of the decomposer community and also by changing plant species composition and litter chemistry. In a warm, humid environment, the decomposition rate is higher because such conditions favor the growth of microorganisms (Yin 1999). Dry and wet site conditions cause slower deadwood decomposition rates (Shorohova and Kapitsa 2014). Błońska and Lasota (2017) observed the highest accumulation of carbon in swampy soils where the anaerobic conditions affected the organic matter decomposition, leading to slower decompositional processes. Temperate and boreal forest soils have been proposed to sequester more carbon dioxide to reduce the pressures of climate change (Wan et al. 2011; Wiesmeier et al. 2016). It has been concluded that warming temperature under the climate change predictions will accelerate C turnover in forest ecosystems because of both carbon inputs via primary production and carbon losses via enhanced decomposition will increase (Stergiadi et al. 2016). Wiesmeier et al. (2016) revealed substantial soil organic carbon decreases by 11–16% under an expected mean temperature increase of 3.3 °C.

The main aim was to estimate how decomposition of deadwood of different tree species (Norway spruce, common aspen and silver birch) with different decomposition rates affects soil organic carbon sequestration in temperate and hemiboreal forests. For the analysis, forests with similar vegetation cover in Poland and Estonia were sampled. We tested the following hypotheses: (1) the deadwood decomposition process of the same tree species differs between hemiboreal and temperate forests; (2) decomposition stage of logs has inherent effect on the amount of soil organic matter; (3) heavily decomposed deadwood of all investigated species impacts soil organic matter stabilization more strongly than less decayed deadwood; (4) the light fraction of soil organic matter is more sensitive to deadwood effects than the heavy fraction.

Materials and methods

Study sites

The investigation was carried out in Poland and Estonia (Fig. 1). In Poland, research plots were located in Czarna Rózga Reserve (50° 59′ N, 20° 01′ E). The reserve area was 185.6 ha. The stands within the boundaries of the reserve were of natural origin. The study area was characterized by the following climatic conditions: the average annual rainfall was 649 mm; the average annual temperature was to 7.4 °C, and the growing season lasted 200–210 days (Błońska et al. 2018). In Estonia, the research plots were located in the Järvselja Training and Experimental Forest District (58° 16′ N, 27° 18′ E). That region was characterized by the following climatic conditions: the average annual rainfall was 647 mm; the average annual temperature was 5.4 °C; and the growing season lasted 179 days (The Estonian Environment Agency: http://www.ilmateenistus.ee/). The forest stands had similar ages (the mean tree age was 95 years). The sample plots were located in an area with a predominance of fluvioglacial sand and loam with Gleysols and Cambisols (WRB 2014). The basic properties of soils investigated (at the depth 0–10 cm) in Poland and Estonia are presented in Table 4.

Fig. 1
figure 1

Localization of research plots and sampling scheme

Field design

Research plots were selected in six forests in Poland and Estonia (three research plots in each country) (Fig. 1). On each study plot, deadwood logs of different species in different stages of decomposition (three species × three decay classes × three distance from logs (0, 10, and 50 cm)) were chosen. Downed deadwood logs of Norway spruce (Picea abies (L.) Karst.), common aspen (Populus tremula L.), and silver birch (Betula pendula Roth) were studied. Logs in three stages of decomposition (III, IV, and V) were selected for the analysis. The decay classes (DC) of logs were evaluated with the classification of dead trees as in Maser et al. (1979) (Table 5). On each research plot, sample points were spaced apart by an average of 30–50 m. The same sampling scheme was used in both countries. The area of each plot was approximately 10 ha. Logs with similar dimensions were selected for the study, the diameter in the center of the log was between 25–30 cm. Soil samples under and around the logs were collected from the A horizon (0–10 cm) after removing the organic horizon (O). The soil samples were collected under the logs (0 cm) and at two different distances from decaying logs (10 and 50 cm) in October 2017. Eighty-one soil samples from Poland and eighty-one soil samples from Estonia were taken for laboratory analysis.

Laboratory analysis

The particle-size distribution of the soils was determined using laser diffraction (Analysette 22, Fritsch, Idar-Oberstein, Germany); pH was analyzed in distilled water and 1 M KCl using the potentiometric method; the content of total nitrogen (N) and organic carbon (C) were measured using a LECO CNS True Mac Analyzer (Leco, St. Joseph, MI, USA).

Physical separations of soil organic matter fractions were also performed (81 soil samples from Poland and 81 soil samples from Estonia). We employed a method described by Sohi et al. (2001). A 15-g sample of soil was placed in a 200-ml centrifuge tube and 90 ml of NaI (1.7 g cm−3) was added. Each tube was gently shaken for 1 min and centrifuged for 30 min. The free light fraction (fLF) was removed using a pipette and collected on a glass fiber filter. The soil remaining at the bottom of the centrifuge tubes was mixed with another portion of 90 mL of NaI and subjected to sonication (60 W for 200 s) to destroy aggregates. After centrifugation, the matter released from the aggregate-occluded light fraction (oLF) was collected on the glass fiber filter. The remaining fraction was assumed to consist of the mineral associated fraction (MAF) of SOM. After drying (40 °C), these subsamples were weighted and analyzed for carbon and nitrogen content (CfLF, CoLF, CMAF and NfLF, NoLF, NMAF) using a LECO CNS True Mac Analyzer (Leco, St. Joseph, MI, USA). The database can be accessed at the following link: DOI:10.5281/zenodo.3386522.

Statistics

Linear mixed model (LMM) was used for the evaluation of the effect of the experimental localities, species, decay classes, and distances from log on soil carbon contents and carbon of different SOM fractions. Experimental plot and deadwood log were included as random factors to account for the spatial dependencies in data (because multiple measurements were made in each plot and next to each log). The LMM analysis was performed with the function lmer (package lme4) in R Statistics software (R Core Team 2018). Tukey’s HSD multiple comparisons of means were used in post hoc analysis to assess the effect of the different experimental localities (Poland and Estonia) and distance on the studied soil properties (carbon content, nitrogen content, C/N, soil organic matter fractions). The principal component analysis (PCA) was used to identify interrelationships that exist among variables and to identify how suites of variables are related. PCA method was used to evaluate the effect of the experimental localities on carbon content and soil organic matter fractions. The statistical significance of the results was verified at the significance level of alpha = 0.05. PCA analysis was performed with Statistica 12 Software (2012).

Results

In both experimental localities, the highest organic carbon (C) content was observed directly under the logs, and C content decreased gradually in subsequent samples moving away from the log outlines (Table 1). These differences intensified with the state of decay and had different levels depending on the species of deadwood. The C content in soil under logs in Polish plots was approximately 3–3.5-fold higher than C contents recorded for comparable conditions in Estonia. Figure 2 shows the differences in the soil organic carbon contents under the logs of different species, at the two experimental localities. Similar relationships were determined with regard to the total nitrogen contents of the experimental sites. Soil under logs analyzed at Polish plots was characterized by a higher total nitrogen content compared to soils in Estonia (Table 1). The value of the C/N ratio in soil samples under comparable logs and at varying distances from the logs had a wide range (means from 13.2–22.0) and was similar for comparable plots in Estonia and Poland. The increase of mean C/N ratio with the wood decay progress was clearly visible in the soil samples collected under logs (Table 1).

Table 1 Carbon and nitrogen content and C/N ratio of soils under deadwood influence in different experimental localities
Fig. 2
figure 2

Difference in of carbon content (delta C (g kg−1)) in soil directly below the deadwood between experimental localities in Poland and Estonia; III–V, decay class. The statistically significant (t test) difference in C content in soil between Poland and Estonia is marked by an asterisk

Considerable differences in the fraction composition of soil organic matter were found between experimental localities. The light fraction C constituted the greatest quantitative component of organic matter in soils under or near deadwood. In the Polish plots, the soil under aspen logs at III DC contained 19.2 g kg−1 CfLF and 57.1 g kg−1 CfLF under spruce logs (Table 2). In the cooler Estonian climate, in soil under aspen and spruce at III DC, a lower amount of free light fraction carbon was accumulated, 4.2 and 8.0 g kg−1 CfLF, respectively. In the case of birch logs, significant differences of SOM fractions between the experimental localities in Poland and Estonia were not found. The CfLF content in soil under logs at IV DC of aspen and spruce was significantly different, being higher in Poland compared to the Estonian plots. In the case of the wood at the highest decay class (V DC), differences between CfLF contents were greater for aspen and spruce wood, while in the soil under birch logs a tendency for CfLF increase was found (85.6 relative to 61.0 g kg−1), which was statistically significant (Table 2). The contents of occluded light fraction carbon (CoLF) in Polish and Estonian soils were influenced by the deadwood of the studied species. The mean CoLF content was 8.4–15.2 g kg−1 at III DC, 7.4–12.9 g kg−1 at IV DC, and 13.7–18.2 g kg−1 at V DC in Estonia, and 8.6–24.0 g kg−1,15.0–− 22.9 g kg−1, and 7.5–29.1 g kg−1 in Poland, respectively. In the case of the mineral associated fraction (CMAF) in soil collected directly under decaying logs, a significant difference was determined for this trait at III DC only in the case of spruce logs (30.2 g kg−1 in Polish plots, 21.2 g kg−1 in Estonian plots). In soil collected under logs at IV DC, significant differences were determined in the cases of birch (21.2 g kg−1 CMAF in Poland; 11.7 g kg−1 in Estonia). Furthermore, significant differences in CMAF contents were found for soil collected under spruce and aspen logs at V DC, in the experimental localities (Table 2).

Table 2 Carbon, nitrogen, and C/N ratio of soil organic matter fractions of soils under deadwood influence in different experimental localities

The free light fraction nitrogen content (NfLF) in soils under or near deadwood of the species studied followed the similar pattern to the carbon. In the case of spruce logs in the Polish climate, the soil located directly under logs contained significantly higher amount of NfLF at all decomposition classes of the tested logs when compared to the amount of NfLF measured in soils from Estonian plots. A higher NfLF concentration under birch and aspen logs was found for IV and V DC logs (Table 2). The nitrogen of the occluded light fraction (NoLF) had similar values in both geographical locations in comparable soils under aspen and spruce logs. Differences in the NoLF contents were observed in soils under birch logs. Nitrogen of the mineral associated fraction (NMAF) had similar values in soils of the plots studied in III and IV DC (Table 2). Differences in the NMAF contents were observed in soils under aspen and spruce logs in V DC. The fLF constitued the greatest share of the total carbon for all samples followed by the heavy fraction, regardless of experimental localities, species of deadwood and decomposition rate (Fig. 3). With the advancement of the decomposition rate, the share of the light fraction of SOM increased irrespective of the deadwood species and experimental locality. This relationship was most pronounced in the soil directly below the deadwood log (Fig. 3). The free light fraction (fLF) was characterized by a higher C/N ratio compared to the occluded light (oLF) and mineral associated fractions (MAF) (Table 2). Comparison of the experimental localities analyzed indicated a tendency for higher values of the C/N ratio in all fractions in soils formed in the cooler climate of Estonia (Table 2).

Fig. 3
figure 3

The ratio of SOM fractions (g kg−1) to total carbon content (g kg−1) in soil under influence of deadwood of different species in different decomposition rates (III–V). Separate graphs present different distance from deadwood (0, 10, and 50 cm)

The effect of the studied experimental locations on the fractional composition of the humus was also confirmed by the PCA analysis (Fig. 4). Factor 1 explained 30% of the variance of the examined properties, whereas Factor 2 accounted for 13% of the variance. The biplot of the cases on the plane of Axis 1 and 2 (Fig. 4) shows the trend to separation of groups of experimental plots from Estonia and Poland. The soils studied at Polish and Estonian plots differed in the C and N contents of individual fractions of soil organic matter. Factor 1 was related to the nitrogen content, carbon content, the carbon of light fraction of soil organic matter, and pH. Factors 2 was associated with carbon and nitrogen of occluded fraction of soil organic matter. The biplot confirmed the higher values of CfLF and NfLF on experimental locations in Poland. LMM analysis confirmed the simultaneous and strong impact of the experimental localities on carbon storage in soil under or near deadwood (Table 3). According to the LMM analysis, the experimental locality had a significant influence on the carbon of the free light fraction of SOM (p < 0.001) and the carbon of the heavy fraction of SOM (p = 0.0012). Experimental localities in connection with species and distance had a significant influence on all SOM fractions. Additionally, species of wood, decay classes, and distances from deadwood had influences on the carbon of light and heavy fractions of SOM (Table 3).

Fig. 4
figure 4

The projection of variables on a plane of the first and second PCA factor (C, carbon content; CfLF, carbon of free light fraction; CoLF, carbon of occluded light fraction; CMAF, carbon of mineral associated fraction; NfLF, nitrogen of free light fraction; NoLF, nitrogen of occluded light fraction, NMAF, nitrogen of mineral associated fraction; III–V, decay classes; 0, 10, 50, distance from log; blue circles, soils in Poland; blue polygons, soils in Estonia)

Table 3 Summary of LMM analysis of the effect of experimental locality, species, decomposition rate (DC), and distance from deadwood on the carbon content and carbon of different SOM fractions in soil, significant effects (p < 0.05) are shown in italics

Discussion

Our study showed differences in the content of soil organic matter at two experimental locations. Higher C contents in the upper mineral soil horizon (0–10 cm) under logs and in their vicinities were recorded in Polish sites compared to the sites in Estonia. The experimental locations differ in thermal conditions, which were exemplified by the differences in the mean annual air temperatures (of 2 °C) and the length of the growing periods (longer by approx. 31 days in the Polish locality). Our study showed that, in warmer conditions (Poland), the deadwood decomposition process had a higher rate than in cooler climate conditions (Estonia). The importance of thermal conditions for the course of the processes of transformations and accumulations of soil organic matter has been confirmed in a series of studies, and it is known to have various foundations (Kirschbaum 1995; Knorr et al. 2005; Scharlemann et al. 2014; Wiesmeier et al. 2016; Von Lützow and Kögel-Knabner 2009). Thermal conditions influence the activity of soil microorganisms and the mesobiota participating in the processes of decomposition as well as the humification of detritus and deadwood accumulated on the soil surface. Bardelli et al. (2017), and Egli et al. (2016), Fravolini et al. (2016, 2018), and Gómez-Brandón et al. (2017a, b) demonstrated that temperature (depending on the location-specific conditions, in mountain areas) influence the composition of microorganisms found in the soil and deadwood and their enzymatic activity, which determines the directions of the transformations and decomposition rates of soil organic matter. A tendency for higher C/N ratio values in all soil organic matter fractions was noted in Estonia. Such outcome has been confirmed in other studies; for example, Ostonen et al. (2017) demonstrated an increase in C/N ratio of soil organic matter and fine roots in spruce and birch forests along a climatic gradient from the temperate to the boreal zone. The soil C/N ratio was the main factor describing the variability of absorptive fine root biomass over stand basal area, which reflected the nutrient uptake efficiency by roots, and also indicated litter quality along the climatic gradient. Higher C/N meant a higher resistance of organic remains to decomposition and a slower decomposition rate: thus, the Estonian sites had slower rates for soil organic matter transformations and deadwood decomposition. This could explain the slower release of deadwood decomposition products in the Estonian sites and higher accumulation of free light fractions under logs and in their direct vicinity in the Polish forests. According to Woodall and Liknes (2008), increases in temperature and/or moisture are required for increases in forest production and subsequent forest detritus accumulations. Cool moist environments provide conditions capable of generating anaerobic conditions in downed deadwood, slowing decomposition, increasing the longevity of downed deadwood, and increasing the probability of burial (Moroni et al. 2015). Climate constitutes a major controlling factor for SOC storage at regional to global scales; mean annual air temperature has proven to be a suitable indicator that could serve as indicator for SOC storage (Wiesmeier et al. 2019).

The effect of tree species that are subject to transformations during decomposition processes may have significant influences on the decomposition rates and decomposition processes. The main cause for this is the differences in the chemical composition of wood from different species (Laiho and Prescott 2004; Prescott and Laiho 2002). In general, the wood of coniferous species is less abundant in such macronutrients as N, P, K, Ca, and Mg than deciduous wood, and the higher content of resinous substances and the different chemical composition of the lignins may hinder the microbial processes of wood decomposition in coniferous species (Błońska et al. 2018; Kögel-Knabner 2002). In agreement with this, the positive effect of the share of deciduous trees volume on soil organic carbon stock has been observed in mixed forests at comparable sites in Estonia (Lutter et al. 2019). Under temperate climatic conditions, SOC stocks under coniferous species may be relatively high, as effect of acidic litter accumulation (Jandl et al. 2007). Our study has demonstrated the influence of the warmer sites in Poland on intensified decomposition and formation of primarily free light fraction SOM. It appears that, among the studied species, spruce wood in the harsher climate of Estonia had the slowest decomposition rate, which was indicated by the relatively low accumulation of soil humus. In these terms, aspen wood appears to possess better properties and a higher susceptibility to decomposition, which was significantly dependent on thermal conditions. The degree of SOM accumulation as well as the characters of humus under birch logs in our study was slightly different between spruce and aspen logs at the experimental sites. By comparing the amounts of carbon and nitrogen in the SOM free light fraction, only minor differences between the experimental locations were determined when comparing spruce to aspen. In the case of soil under birch logs, a significantly higher accumulation of nitrogen associated with occluded light fraction (oLF) was found for the warmer Polish climate. We believe that this stems from the release of better-mineralized deadwood decomposition products, which are bound with the soil mineral substance. The study of Lasota et al. (2017) demonstrated that birch wood releases large amounts of ammonium ions and nitrate anions at earlier decay classes. The intense leaching of these compounds to soil located under the log may be linked to the higher nitrogen concentrations in the fractions of SOM creating bonds with soil minerals.

The effect of deadwood on the content of soil organic matter is intensified for subsequent decay classes. At III DC, the increase of the SOM content in the warmer Polish climate was observed solely under the analyzed logs. In more advanced DC (IV and V), the influence of decaying wood on the SOM content was exhibited also nearer to logs (at up to 10 cm). This is in line with the earlier study of Błońska et al. (2017). Wambsganss et al. (2017), who studied the accumulation of various SOM fractions under beech logs on two types of geological substrates, studied the increase of the content of SOM free light fraction and occluded light fraction on siliceous substrate. In our study, in the case of logs at advanced decay class (V DC) in Poland, we were able to record an increase of SOM mineral associated fraction under aspen and spruce logs (apart from the increase of free light fraction). Similar mineral content of associated fractions were determined in the case of birch logs at both locations studied. At the same time, in Poland, a higher content of C and N from the SOM occluded light fraction was determined for III DC directly under birch logs, which can be associated with the intense release of decomposition products from wood of this species at higher decomposition stages, which has been confirmed in earlier studies of the authors (Lasota et al. 2017). Soil organic matter fractions clearly exhibit the influence of decomposing wood regardless of location. As decay progresses, the share of individual SOM fractions changes. The light fraction of soil organic matter is more sensitive to deadwood effects than the heavy fraction. Free light fraction, since it is easily degradable and requires only a short circulation time, is used to indicate changes or disturbances in the amount of litter input (Crow et al. 2007; Krueger et al. 2016). SOM fractions analysis can be used to assess the stability and circulation of SOC between deadwood and soil in different experimental localities.

Conclusions

Our study has confirmed that deadwood of different tree species with different decomposition rates affects soil organic carbon sequestration in Estonia and Poland forests. A higher sequestration of carbon in surface soil horizons as an effect of the deadwood decomposition process has been determined in the Polish forests. The processes of soil organic matter transformations and deadwood decomposition in the Estonia forests had slower rates. The positive influence of the species studied on the SOM stabilization was also notable, but the effect differed among the species. More-decomposed deadwood impacts soil organic matter stabilization more strongly than less-decayed deadwood. This relationship was clearer in Poland. Higher temperature and longer growth period primarily influenced the increase of the concentration of free light fraction of SOM directly under and near logs of the species studied. The slower release of deadwood decomposition products was perceptible for the forests in Estonia. In the case of logs at advanced decomposition rates in Poland, the increase of the SOM mineral associated fraction under aspen and spruce logs was evident.

Data availability

The datasets generated during the current study are available in the Zenodo repository (Błońska et al. 2019) at https://doi.org/10.5281/zenodo.3386521

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Funding

The project was financed by the National Science Centre, Poland: decision no. DEC-2016/21/D/NZ9/01333 and institutional research funding IUT (grants IUT21-4 and IUT 34-9) and the project P170053MIMK of the Estonian Ministry of Education and Research. The contribution of I. Ostonen was supported by Center of Excellence: EcolChange (the European Regional Development Fund). We acknowledge networking support by the COST Action FP1305 (Biolink).

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Correspondence to Ewa Błońska.

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The authors confirm obtaining the permission to conduct the study in Czarna Rózga Reserve. The permission was issued by Regional Directorate for Environmental Protection in Łódź (Poland) (WPN-I.6205.78.2016.DB).

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Contribution of the co-authors

Ewa Błońska: planning of work, participation in the implementation of field work and collecting data, statistical analysis, writing of the manuscript

Jarosław Lasota: implementation of field work and collecting data, statistical analysis

Arvo Tallus: implementation of field work and collecting data

Reimo Lutter: implementation of field work and collecting data

Ivika Ostonen: interpretation of results and writing of the manuscript

Handling Editor: Ana Rincón

Appendix

Appendix

Table 4 The basic chemical properties of investigated soils (depth 0–10 cm)
Table 5 Decay class characteristics by Maser et al. (1979)

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Błońska, E., Lasota, J., Tullus, A. et al. Impact of deadwood decomposition on soil organic carbon sequestration in Estonian and Polish forests. Annals of Forest Science 76, 102 (2019). https://doi.org/10.1007/s13595-019-0889-9

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Keywords

  • Carbon accumulation
  • Decomposition stage
  • Soil organic matter fractions