کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8364215 | 1542599 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Environmental stress response limits microbial necromass contributions to soil organic carbon
ترجمه فارسی عنوان
واکنش استرس زیست محیطی، کمک به نیکروماس میکروبی را به کربن آلی خاک محدود می کند
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش خاک شناسی
چکیده انگلیسی
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 13C-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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Biology and Biochemistry - Volume 85, June 2015, Pages 153-161
Journal: Soil Biology and Biochemistry - Volume 85, June 2015, Pages 153-161
نویسندگان
Thomas W. Crowther, Noah W. Sokol, Emily E. Oldfield, Daniel S. Maynard, Stephen M. Thomas, Mark A. Bradford,