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Decomposition of 51 semidesert species from wide-ranging phylogeny is faster in standing and sand-buried than in surface leaf litters: implications for carbon and nutrient dynamics

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Abstract

Background and aims

Higher than expected litter decomposition rates have been observed in dry, sunny environments due to photochemical or physical degradation. However, our understanding of carbon and nutrient fluxes of standing and buried litters compared to surface litter in such areas is still scarce.

Methods

We sampled leaf litters from 51 species in a semiarid dune ecosystem and incubated them in three positions: surface, sand-buried and simulated standing.

Results

Decomposition was much faster in buried litter and somewhat faster in simulated standing litter than in surface litter. This pattern was independent of the incubation period, phylogenetic group or growth form. Litter position and incubation period significantly impacted litter nutrient dynamics. The nitrogen (N) and phosphorus (P) losses were faster in buried and simulated standing litters than in surface litter. The N loss was slower than P loss in 6-month decomposed litter but the former was relatively faster than the latter in the second phase up to 12 months of incubation.

Conclusions

Our study shows that substantial mass and nutrient losses in simulated standing and buried litters can be a candidate explanation why drylands have higher carbon and nutrient fluxes than expected based on surface litter decomposition data alone.

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Acknowledgments

We thank Dr. Ruiru Gao at Institute of Botany, Chinese Academy of Sciences (CAS) for his many suggestions for species identification. We give special thanks to Mr. Zhihua Liu for his substantial help in leaf litter collecting. We thank Dr. Fangli Luo at Beijing Forestry University for her help in measuring light interception by the litterbag. We also thank Ordos Sandland Ecological Research Station in Mu Us sandland, CAS for providing meteorological data including precipitation, temperature, frozen soil layer, wind speed, and solar radiation for the whole experimental year. In addition, we thank several college students at Changchun Normal University, China including Jianguo Chen, Xing Fu, Wan Zhang and Yinyan Xie for their help in cleaning litterbags. This study was supported by the National Natural Science Foundation of China (NSFC, 31100333, 31470712) and the Young Talents in State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, CAS (80006 F2059) and partly supported by Laboratory Open Fund in Institute of Grassland Science, Northeast Normal University, China. JHCC, WKC, MD, GL and XP were partly funded by the Royal Netherlands Academy of Arts and Sciences (KNAW, Chinese Exchange Programme grant 12CDP007). FL was partly funded by NSFC (grant no. 31100300). MD was partly funded by NSFC (grant no. 31261120580) and the Innovative R & D grant of Hangzhou Normal University, China (grant no. PD12002002004001).

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Correspondence to Zhenying Huang or Ming Dong.

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Responsible Editor: Fernando T. Maestre

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Fig. A1

Mean wind velocity (a), and light intensity including Ultraviolet (UV, b) and Photosynthetically active radiation (PAR, c) from November 2011 to November 2012, and relative humidity among litter positions (d) for litter incubation site from September to the end of October 2012. The solid line denotes the fitted local smoothing spline. (DOCX 120 kb)

Fig. A2

A line plot (mean ± SE, n = 51) of fraction of leaf litter mass loss after 0, 6, 9 and 12 months. Same lowercase letter for each harvest indicates no significant difference in fractions of leaf litter mass loss among litter positions at P <0.05. (DOCX 58 kb)

Fig. A3

Bar plots (mean ± SE, n = 51) of the total carbon concentration (% C) (a), total nitrogen concentration (% N) (b), total phosphorus concentration (P) (c), C/N ratio (d), N/P ratio (e), and C/P ratio (f) of half-year-decomposed and one-year-decomposed litters among three litter positions including simulated standing, surface and sand burial conditions. Same lowercase letter denotes no significant difference in nutrient concentration at P <0.05. The horizontal gray line denotes nutrient concentration or stoichiometry of initial leaf litter. The values with asterisk (*) denotes a significant difference in carbon and nutrient concentration compared with initial leaf litter at P <0.05. (DOCX 133 kb)

Fig. A4

Average temperatures of atmosphere (a), surface (b) and 10 cm soil depth (c) and the depth of frozen soil layer (d) during the period from November 2011 to October 2012. (DOCX 376 kb)

Fig. A5

The variation in total solar radiation (Eg), photosynthetically active radiation (PAR) and the pattern of ultraviolet (UV) radiation during the period from November 2011 to October 2012. (DOCX 151 kb)

Table A1

All species list in this study and their corresponding families, growth form (one of tree, shrub, grass, herbaceous legume and forb) and phylogenetic group (one of fern, gymnosperm, monocot and eudicot). (DOCX 21 kb)

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Uploaded as online supporting information (“PLSO-D-15-00316.data.xlsx”). (XLSX 57 kb)

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Liu, G., Cornwell, W.K., Pan, X. et al. Decomposition of 51 semidesert species from wide-ranging phylogeny is faster in standing and sand-buried than in surface leaf litters: implications for carbon and nutrient dynamics. Plant Soil 396, 175–187 (2015). https://doi.org/10.1007/s11104-015-2595-1

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