Environmental stress response limits microbial necromass contributions to soil organic carbon

被引:57
作者
Crowther, Thomas W. [1 ]
Sokol, Noah W. [1 ]
Oldfield, Emily E. [1 ]
Maynard, Daniel S. [1 ]
Thomas, Stephen M. [1 ]
Bradford, Mark A. [1 ]
机构
[1] Yale Univ, Yale Sch Forestry & Environm Studies, New Haven, CT 06520 USA
基金
美国国家科学基金会;
关键词
Necromass; Decomposition; Stabilization; Fungi; Soil organic carbon; Grazing; Stress response; MATTER; DECOMPOSITION; STABILIZATION; INPUTS; PLANT; NUTRIENT; IMPACT;
D O I
10.1016/j.soilbio.2015.03.002
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
The majority of dead organic material enters the soil carbon pool following initial incorporation into microbial biomass. The decomposition of microbial necromass carbon (C) is, therefore, an important process governing the balance between terrestrial and atmospheric C pools. We tested how abiotic stress (drought), biotic interactions (invertebrate grazing) and physical disturbance influence the biochemistry (C:N ratio and calcium oxalate production) of living fungal cells, and the subsequent stabilization of fungal-derived C after senescence. We traced the fate of C-13-labeled necromass from 'stressed' and 'unstressed' fungi into living soil microbes, dissolved organic carbon (DOC), total soil carbon and respired CO2. All stressors stimulated the production of calcium oxalate crystals and enhanced the C:N ratios of living fungal mycelia, leading to the formation of 'recalcitrant' necromass. Although we were unable to detect consistent effects of stress on the mineralization rates of fungal necromass, a greater proportion of the non-stressed (labile) fungal necromass C was stabilised in soil. Our finding is consistent with the emerging understanding that recalcitrant material is entirely decomposed within soil, but incorporated less efficiently into living microbial biomass and, ultimately, into stable SOC. (C) 2015 Published by Elsevier Ltd.
引用
收藏
页码:153 / 161
页数:9
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