Turnover of soil organic matter and of microbial biomass under C3-C4 vegetation change: Consideration of 13C fractionation and preferential substrate utilization
Turnover of soil organic matter and of microbial biomass under C3-C4 vegetation change: Consideration of 13C fractionation and preferential substrate utilization
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DOI：
10.1016/j.soilbio.2010.09.028
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发表时间：
2011-01-01
影响因子：
9.7
通讯作者：
Kuzyakov, Y.
中科院分区：
文献类型：
--
作者：
Blagodatskaya, E.;Yuyukina, T.;Kuzyakov, Y.
土壤池中δ C-13特征的变化主要受两个过程的影响：C-13本身的分异和不同δ C-13特征的基质对微生物的优先利用。通过同时跟踪土壤有机质（SUM）、微生物生物量、溶解有机碳（DOC）三个库以及1)C-3- c4植被变化后土壤和2)参考C-3土壤孵育期间CO2外排中的δ C-13，解开了这两个过程的纠缠。研究对象为C-3植被下发育的一种多质Gleyic Cambisol的Ap层。Miscanthus giganteus是一种多年生的C-4植物，种植了12年，δ C-13特征被用来区分“老”SUM（>12年）和“新”Miscanthus衍生的C (
Two processes contribute to changes of the delta C-13 signature in soil pools: C-13 fractionation per se and preferential microbial utilization of various substrates with different delta C-13 signature. These two processes were disentangled by simultaneously tracking delta C-13 in three pools - soil organic matter (SUM), microbial biomass, dissolved organic carbon (DOC) - and in CO2 efflux during incubation of 1) soil after C-3-C4 vegetation change, and 2) the reference C-3 soil.The study was done on the Ap horizon of a loamy Gleyic Cambisol developed under C-3 vegetation. Miscanthus giganteus - a perennial C-4 plant - was grown for 12 years, and the delta C-13 signature was used to distinguish between 'old' SUM (>12 years) and 'recent' Miscanthus-derived C (