Abstract
We have to deal with spruce dieback in recent years in Europe. Fertilization can be used to reduce susceptibility to forest dying through improving the chemical properties of soil. The aim of this study was to assess the condition of soil and spruce stand after dolomite, magnesite and serpentinite fertilization. The fertilization was used to sustain a stable condition and extended the life of spruce stands by several years which allows the reconstruction of the stand. The experimental plots were set up in the areas of two Carpathian nappes, differing in terms of lithological deposits, in Wisła and Ujsoły Forest Districts. Fertilization improves the chemical properties and enzymes activity of soil. The used fertilization variants did not cause inhibition of soil enzymatic activity. The effect of liming is visible mainly in the humus horizon, and in the deeper mineral soil, a significant change was not found. Heavy metals, mainly nickel introduced with serpentinite, did not inhibit the activity of enzymes. As a result of fertilization, the process of dying spruce was delayed. Three years after fertilization, a clear improvement in the chemistry of spruce needles was not recorded.
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Introduction
We have to deal with spruce dieback in recent years in Europe. People’s activities have increasingly led to the acidification of terrestrial ecosystems (Reuss and Johnson 1986). Fertilization can be used to reduce susceptibility to forest dying through improving the chemical properties of soil. Fertilization of forest land can be a way to prevent weakening of the forest stands. Thus, it is important to know the basic issues related to the effects of fertilization on the soil properties and forest stands. The use of liming to reduce acidity of forests soils was recommended in Germany as far back as of the end of the last century (Deroma et al. 2000). Numerous liming experiments were established in Finland and Sweden (Viro 1951). The changes in soil chemistry after liming were demonstrated by Kruetzer (1995). Liming was used to raise soil pH and to increase concentrations of Ca and Mg (Saarsalmi et al. 2011; 2014).
In the area of the Beskidy Mountains, we noticed increasing share of decaying spruce stands or a potential risk of its occurrence in the future (Małek 2010; Małek et al. 2012). The aim of fertilization by dolomite, magnesite and serpentinite is to delay dying of spruce stands. A significant improvement in the chemistry of spruce needles after applying fertilizer was not expected. Sustaining the existing forest stands as a result of fertilization will allow their reconstruction. The published data based on field experiments have not presented short-term effects of liming on survival and growth trees. Sikström (2005) investigated the survival of Picea abies seedlings during the first 11 growing seasons after liming. Many researchers (Børja and Nilsen 2009; Jonard et al. 2010) have studied the long-term effects of liming on forest stands.
Badalucco et al. (1992), Liu (2004) and Mijangos et al. (2006) studied the effect of fertilization on soil fertility by investigating soil enzymatic activity. Ajwa et al. (1999) noted that biological parameters have a considerable value as early and sensitive indicators of the changes in soil properties induced by different management strategies and fertilization. In comparison with the biological and biochemical properties, the physical and chemical ones constitute a less sensitive indicator of changes that occur in soil (Błońska and Januszek 2013). The biological indicators, such as enzymatic activity and microbiological biomass, seem to be better indicators since they respond much faster to both natural and anthropogenic factors in comparison with other variables (Garciá et al. 2000). Clivot et al. (2012) study contributes to confirming the usefulness of microbial indicators by providing a common indicator of liming effects 4 years later. The dehydrogenases represent enzymes which provide information about environmental conditions and microbial activity in the soil. The activity of dehydrogenases is extremely important in organic matter dynamics (Paradelo and Barrales 2009). Urease is an enzyme that catalyzes the hydrolysis of urea into carbon dioxide and ammonia. The urease activity like dehydrogenase activity reacts promptly to changes in the use of soil (Gil-Sotres et al. 2005). Badalucco et al. (1992) observed that addition of lime to acid forest soils has the beneficial effects on microbial biomass and microbial activity. Dehydrogenase activity was increased by liming.
The aim of this study was to assess soil and spruce stand condition after dolomite, magnesite and serpentinite fertilization. The fertilization was used to sustain a stable condition and extended the life of spruce stands by several years which allows the reconstruction of the stand. We hypothesized that: (1) fertilization improves the chemical properties and enzymes activity and (2) by improving soil properties, the dieback of stand can be postponed and its condition improved.
Materials and methods
Study area and experimental design
The experimental plots were set up in the areas of two Carpathian nappes, differing in terms of lithological deposits. The Magura Nappe (Ujsoły Forest District) is built of thin-bedded sandstone with a share of clay slate inclusions, with meso-/eutrophic soils that are more buffered and resistant to degradation. The Silesian Nappe (Wisła Forest District) in the range of Barania Góra Mountain, built of the lower Istebna layers, consists of thick-bedded sandstones and conglomerates, producing sandy-loam, gravelly cobbly waste mantle with oligotrophic soils. The Haplic Podzol soil built of very stony, coarse sandy-loam stratiform of very cobbly sandy loam with mor type of humus was noted on the experimental plots in Wisła. The Endoeutric Cambisol built of loam deposition on very cobbly clay loam and very cobbly silty clay loam with the moder type of humus was noted on the experimental plots in Ujsoły. A more comprehensive description of the soils and results of soil analysis 1 year after fertilization in the Wisła and Ujsoły research plots was presented by Januszek et al. (2011). The results of soil analysis 2 years after fertilization in the Wisła and Ujsoły research plots were presented by Małek et al. (2014).
The experiment was carried out on plots (10 × 10 m) with 5-m insulating strips between plots. Fertilizers were added in autumn 2008. The 4 treatments were used: C control no fertilizer; D dolomite (4000 kg/ha in the Wisła Forest District; 2000 kg/ha in the Ujsoły Forest District); M magnesite (4000 kg/ha in the Wisła Forest District; 2000 kg/ha in the Ujsoły Forest District); S serpentinite (4000 kg/ha in the Wisła Forest District; 2000 kg/ha in the Ujsoły Forest District). Fertilizer containing fine particles (ø 0–1 mm). The composition of used fertilizers is presented in Table 1.
Soil sampling and analysis
Soil samples were collected on the experimental sites in Wisła and in Ujsoły in September 2011. On the experimental sites in Wisła, from every plot (10 × 10 m each) two aggregate samples were collected from 4 holes randomly placed within plot with the size of 20 × 20 × 20 cm. The first sample was obtained from the organic horizon (without further sub-horizons), and one was taken from the AE horizon down to 20 cm. The soil samples on the experimental sites in Ujsoły were obtained from the depth of 0–10, 10–20 cm, respectively. The soil for determining chemical and physical properties was collected after removal of the litter layer. In all the cases, samples for the research were collected from 4 sub-stands of the soil horizon. Samples were returned to the laboratory for analysis. The collected samples were first dried at room temperature and then sieved through a 2-mm sieve. The sample parameters and method of analysis are presented in Table 2.
Enzyme activities
The dehydrogenase activity was determined using Lenhard’s method according to the Casida procedure. The method is known as “the TTC” test, and 3 %solution of triphenyltetrazolium chloride (TTC) was used. For washing out the formazan gathered in soil, ethyl alcohol contaminated with methanol was used (Alef and Nannipieri 1995). Urease activity was marked with Tabatabai and Bremner’s method (1972) (Alef and Nannipieri 1995). In each cumulative sample of the natural moisture after sieving through a sieve with an aperture of 2 mm, the activity of enzymes was determined, in three repetitions. Dehydrogenase activity was determined in samples collected in 2011. Urease activity was determined in samples collected in 2010.
Stand characteristics
On experimental plots, trees were numbered, the diameter at breast height and tree heights of all the trees were measured. Trees were evaluated according to the IUFRO classification and the percentage of thinning canopy and the leaf area index (LAI) were determined using LAI 2000 from LI-COR apparatus. According to the methodology of ICP Forest Manual (1998), branches of the seventh whorl from the top of the three standing spruce sample trees were cut. Trees were selected at random. Current and 2-year-old needles were taken for chemical analyzes. N and S were determined with CNS 2000 LECO elemental analyzer, and K, Mg, Ca, Ni with Thermo Scientific iCAP 6000 ICP OES Spectrometer after wet mineralization with HNO3 and HClO4 in 1:4.
Statistical analysis
Statistical data analysis was performed using the program Statistica 10. In order to reduce the number of variables in statistical data set and visualize multivariate data set, PCA method was used. PCA method was also used in order to interpret factors depending on the kind of data set. In PCA analysis, the physicochemical properties and enzymes activity of soil were used. Differences between the mean values were evaluated with the nonparametric Kruskal–Wallis test.
Results
Physicochemical properties of soils
A significant impact of used fertilization variant on the pH in surface horizon (Ofh and OhA) of soil was noted. The pH increase depended on the fertilization variant, the dose of fertilizer and soil properties (Table 3). A lower concentration of exchangeable aluminum was found in the horizons of soils with fertilization compared to the control. Higher concentration of exchangeable calcium in all the horizons of soil with dolomite fertilization (D) of the plot was noted. After magnesite fertilization of the soil in Wisła, the concentration of exchangeable calcium in the mineral horizon tended to decrease. The applied fertilization affected the concentration of exchangeable magnesium in soil horizon. In the Ofh and AE horizon of soil in Wisła, the tendency to decrease the concentration of carbon and nitrogen in the fertilization variants compared to the control was noted. Higher concentrations of nickel were found in the serpentinite variant and lower in control variants and dolomite and magnesite treatment (Table 3). In the organic horizon, a significant difference (<0.05) in soil properties: pH, Al, Ca, Mg, Ni and Cr content compared to the control, was noted (Table 3).
Enzyme activities
Dehydrogenase activity increased in all the fertilization variants compared with the control in organic horizons. A less pronounced increase in dehydrogenase activity was noted in the humus mineral horizons. A strong increase in urease activity was noted in the case of dolomite and magnesite fertilization. Serpentinite fertilization had the least significant influence on urease activity. The strongest increase in urease activity was reflected in the organic horizon (Table 3). The activity of enzymes was strongly associated with the pH. It was found that the enzyme activity of the studied soil increased with the pH and cations content. The activity of enzymes negatively correlated with the Al content (Fig. 1). Significant differences were noted in the organic horizon on the Wisła plot in the dehydrogenase activity (Table 3).
PCA analysis
One year after fertilization, the influence of magnesite and dolomite was observed, whereas 3 years after fertilization, the impact of serpentinite fertilizer additionally was noted (Fig. 1, 2). The impact of fertilization was reflected in the organic horizon (Ofh), and the lack of enzyme activity stimulation after fertilization in mineral horizons (AE) was noticed. In the organic horizon in Wisła 3 years after fertilization, factors 1 and 2 explained variances of the variables in 64.97 % (Fig. 1). Factor 1 which explains 41.18 % of the variation is strongly associated with pH, Al and Mg content. Factor 2 is strongly correlated with quality of organic matter (ratio C/N). This factor explains 26.14 % of the variance of the examined properties. In organic horizon in Ujsoły, two main factors were selected that have impact on the variances of the variables. Factor 1 and 2 explained 73.75 % variation of the examined properties. Factor 1 is associated with pH and Al content. Factor 2 is correlated with C, N content and C/N ratio (Fig. 2).
Stands characteristic
A greater and more diverse percentage of trees were fallen in Ujsoły, while in Wisła the dieback was less significant and less diversified (Table 4). The sown fertilizer had a positive effect on stands in Ujsoły, clearly slowing down the process of tree dieback, especially in the magnesite variant. The use of magnesite had a greater impact on slowdown of thinning canopy in spruce stands. Stand leaf area index (LAI) has also changed, which was influenced by the size of the dead trees and thinning canopy. The ranges were about 0.5–0.6 units (Wisła) and 0.2–0.5 units (Ujsoły) (Table 4).
In the chemical composition of spruce needles, the increase in concentrations of potassium from plots fertilized with dolomite and magnesium was observed. In needles from 2011 compared to 2009 in Ujsoły, nitrogen content decreased in all the variants, while in the Wisła area it occurred only on the fertilized variants (Table 5). In relation to the limit values and in the proportions between elements, the situation varied. In 2011, in Ujsoły it was exceeded only in 4 out of 24 possible variants: with magnesite (for S:Ca, N:Ca and K:Ca) and dolomite (K:Ca). In Wisla, the amount of exceeded value increased to 11 mainly for S:Ca and N:Ca and K:Ca. The levels of the analyzed microelements in spruce needles were differed. The content of Ni in the needles of spruce in both periods was higher on Ujsoły plot (Table 5).
Discussion
The expected positive influence of fertilization on the deacidification of soil and increase in Ca and Mg supply of the soil were noted. Following fertilization, an increase in pH and a decrease in the concentration of exchangeable aluminum were observed. The great increase in pH and decrease in exchangeable aluminum were recorded in organic horizons. In AE and AB horizon, the difference was less conspicuous. Among the used fertilizers (dolomite, magnesite and serpentinite), serpentinite fertilization provided a significant enhancement of soil in magnesium over a long period of time because it has low susceptibility to weathering and low pH increase. The use of slowly released fertilizer containing macro- and micronutrients was more favorable for improving nutrient deficiencies than rapidly soluble fertilizers (Flückiger and Braun 1995). Liming is known not only to increase pH, base saturation, exchangeable Ca and Mg, but also to increase microbial activity (Persson et al. 1990; Kreutzer 1995; Lorenz et al. 2001).
In the surface horizon of studied soils, the pH value was increased as a result of sowing carbonate fertilizers. This has contributed to improving the microbial activity, which was reflected in an increase in the activity of dehydrogenase and urease. In the case of both enzymes, their activity increased while exchangeable alkaline cations increased too. Enzyme activities can be affected by factors such as temperature, moisture, pH, nutrient availability (Baldrian et al. 2012). Soil pH affects the activity of soil enzymes through its controls on microbial enzyme production, availability of substrates and enzymatic co-factors (Tabatabai 1994). The increased activity may be due to the increase in the number of microorganisms and microbial activity. According the Xiao-guang et al. (2011), the increased soil enzyme activities of fertilization-treated soils may be the consequence of both microbial growth and stimulation of microbial activity by enhanced resource availability.
No negative impact of used serpentinite fertilizer on the enzymatic activity of studied soils in spruce stands shows the absence of toxic concentrations of heavy metals in the soils and indicates the possibility of using this type of fertilizer in forestry. The study of enzymatic activity indicates that heavy metals, mainly nickel brought with serpentinite to soil, did not inhibit the activity of enzymes. Heavy metals can stimulate the activity of soil enzymes in smaller amounts, but they can also act as inhibitors if present in high concentrations (Frankenberger et al. 1983; Wyszkowska et al. 2001). Previous studies showed that soil contamination with high heavy metal content could have a negative impact on soil organisms and consequently on the biochemical activity of soil (Friedlová 2010).
The most rapid organic matter mineralization in soils fertilized with dolomite and magnesite is an additional effect observed in this experiment. Liming is expected to increase soil C losses, because of lime-induced increases in soil biological activity and therefore rates of soil CO2 respiration (Biasi et al. 2008). Soil enzymes activities are sensor of soil organic matter decomposition since they integrate information about microbial status and soil physicochemical conditions (Sinsabaugh et al. 2008). The increase in enzyme activity was noted in soils with dolomite and magnesite fertilization where loss of organic matter was observed.
The effects of liming (2.0 and 4.0 Mg ha−1) on chemical properties of soil, nutrient concentrations of needles and growth of Scots pine (Pinus sylvestris L.) were investigated by Saarsalmi et al. (2011). Huang et al. (2014) noted the increase in herb biomass and Mg content in Masson pine needles. The growth rate of Masson pine did not increase possibly because of the limited observation period. In Wisła and Ujsoły, the conducted fertilization significantly improved soil properties, whereas the poorer condition of forest stands was only slightly improved. The nitrogen content in spruce needles was below the optimal values: according to Arndt et al. (1987), in the range of low values (<1.31 % dm); according to Zöttl (1990), below the range of the average deficit (1.2–1.3 %); and according to Cape et al. (1990), even in the “visible signs of deficiency” (0.8–1.3 %). Fertilizers used on research plots generally resulted in the decrease in potassium. Most K (approx. 0.06 %) was in dolomite, and in this variant, most potassium in the needles was determined in 2009. Insignificant predominance of this element in 2011 in the Wisła and Ujsoły was maintained. In 2011, the calcium content in both locations declined. According to Arndt et al. (1987), the level of Ca in spruce needles can be generally defined as high, according to the Zöttl’s data (1990)—as the optimal (with the exception of the plot with magnesite—average value of a deficit) and according to Cape et al. (1990)—as the shortage. Concentrations were within the range specified by the Fober (1998) for spruce needles “showing external signs of Ca deficiency.” Analyses of needles from 2011 indicate that the Mg content in the needles is still higher in Ujsoły than in Wisła. In Ujsoły, they remain in the range of optimum values, and in Wisła, in the range of average deficit (Zöttl 1990). According to Arndt et al. (1987), the content of this element in the needles in both locations is in the range “for not showing symptoms spruce deficit.” The effect of liming on tree growth is dependent on the soil chemical properties, particularly the deficiency of Ca and Mg (Jonard et al. 2010). In addition, the reaction of forest stands to liming can be affected by such factors as tree species and age (Kakei and Clifford 2002). It was reported that lime application had no effects on loblolly pine after 20 years (Torbert and Burger 1984) and Norway spruce and beech after 40 years (Persson et al. 1995). Huber et al. (2006) noted that liming had a relatively insignificant effect on the needle chemistry.
The applied fertilization had a positive impact on the health condition of stand, and it slowed down the process of dying trees especially after using magnesite. It indicated a tendency to improve the viability of trees and their growth compared to the control variant. The sown fertilizer contributed to the slowdown in the thinning canopy, which increased in most variants over the period, but always less than in the control variant. The stand leaf area index (LAI) decreased due to the loss of trees and thinning canopy. On both surfaces, the lowest values of differences in LAI from 2008 to 2011 were noted in magnesite variant. LAI indicator quickly responded to the presence of stress factors in plants (Stenberg et al. 2004). In our study, LAI turned out to be an effective tool for the evaluation of the fertilization effects.
Conclusions
-
1.
Fertilization improves the chemical properties and enzymes activity of soil. The used fertilization variants did not cause inhibition of soil enzymatic activity. The pH increase in organic horizons as a result of the use of carbonate rocks led to the increase in the activity of dehydrogenases and urease in all fertilization variants.
-
2.
The effect of liming is visible mainly in the humus horizon; in the deeper mineral soil, a significant change was not found. The very slow release of soluble ions from the rock fertilizer and a temporary pH decrease are the cause of the lack of stimulation of the applied fertilizers on the enzyme activity in mineral horizons.
-
3.
Heavy metals, mainly nickel introduced with serpentinite, did not inhibit the activity of enzymes.
-
4.
The results have shown that fertilization caused the increase in soil C losses.
-
5.
The used fertilizer improved the properties of soil, which directly resulted in the improvement of the condition of the stand. As a result of fertilization, the process of dying spruce was delayed. The sown fertilizer had an impact on decreasing spruce canopy opening.
-
6.
Three years after fertilization, a clear improvement in the chemistry of spruce needles was not recorded.
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Acknowledgments
This work was financed by the State Forests National Forest Holding in Poland within the project: 3/08—Forest management measures improving the growth, nutrition and health conditions in forest regeneration areas and endangered stands in the Beskidy Mountains, with particular emphasis on soil revitalization with dolomites and new multi-component long-acting fertilizers.
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Communicated by Agustín Merino.
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Błońska, E., Małek, S., Januszek, K. et al. Changes in forest soil properties and spruce stands characteristics after dolomite, magnesite and serpentinite fertilization. Eur J Forest Res 134, 981–990 (2015). https://doi.org/10.1007/s10342-015-0903-1
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DOI: https://doi.org/10.1007/s10342-015-0903-1