期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 81, 期 -, 页码 134-142出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2014.11.009
关键词
Litter C-to-N ratio; Depolymerization; Mineralization; Drylands; Dissolved organic N
类别
资金
- Spanish Government [CGL2010-21381, AGL2010-10935-E, CGL2011-28778]
- Madrid Regional Government [REMEDINAL-2]
- European Union Project [BiodivERsA-FACCE2014-39]
- European Research Council under the European Community's Seventh Framework Programme (FP7)/ERC [242658]
- European Commission's FP7 Marie Curie IEF grant [DECOMFORECO-2011-299214]
Climate and litter quality have been identified as major drivers of litter decomposition, but our knowledge of how soil characteristics (e.g. microbial community and chemical properties) determine carbon (C) and nitrogen (N) availability derived from the decomposition of litter of different qualities is still scarce. We conducted a microcosm experiment to evaluate how soils with contrasting microbial communities and soil properties (denoted Soils A and B hereafter, where Soil B has higher bacterial and fungal abundance, fungal:bacterial ratio, and organic C than Soil A) determine the availability of soil C (carbohydrates, proteins, amino acids and phenols) and N (dissolved organic and inorganic N, microbial biomass N and available N) during the decomposition of litter of contrasting quality (C:N ratios ranging from 20 to 102). We also evaluated the relative importance of soil characteristics and litter quality as drivers of C and N inputs to the soil during this process. Overall, higher soil C and N availability after litter decomposition was found in Soil B than in Soil A. Soil characteristics had a higher positive effect on soil C and N contents than litter quality during litter decomposition. We also found that changes in N availability and organic matter quality registered after litter decomposition, linked to different soil characteristics, were able to promote dissimilarities in the potential mineralization rates. In conclusion, our study provides evidence that soil characteristics (e.g. microbial communities and chemical properties) can be more important than litter quality in determining soil C and equally important for N availability during the decomposition of leaf litter. (C) 2014 Elsevier Ltd. All rights reserved.
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