Scopus记录号: 2-s2.0-85056801633
论文题名: Microbial formation of stable soil carbon is more efficient from belowground than aboveground input
作者: Sokol N.W. ; Bradford M.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2019
卷: 12, 期: 1 起始页码: 46
结束页码: 53
语种: 英语
Scopus关键词: biomass
; carbon cycle
; microbial activity
; microbial community
; microcosm
; organic carbon
; rhizosphere
; soil carbon
; soil stabilization
英文摘要: The relative contributions of aboveground versus belowground plant carbon inputs to the stable soil organic carbon pool are the subject of much debate—with direct implications for how the carbon cycle is modelled and managed. The belowground rhizosphere pathway (that is, carbon exiting the living root) is theorized to form stable soil carbon more efficiently than the aboveground pathway. However, while several mechanisms have been invoked to explain this efficiency, few have been empirically tested or quantified. Here, we use soil microcosms with standardized carbon inputs to investigate three posited mechanisms that differentiate aboveground from belowground input pathways of dissolved organic carbon—through the microbial biomass—to the mineral-stabilized soil organic carbon pool: (1) the physical distance travelled, (2) the microbial abundance in the region in which a carbon compound enters (that is, rhizosphere versus bulk soil) and (3) the frequency and volume of carbon delivery (that is, infrequent ‘pulse’ versus frequent ‘drip’). We demonstrate that through the microbial formation pathway, belowground inputs form mineral-stabilized soil carbon more efficiently than aboveground inputs, partly due to the greater efficiency of formation by the rhizosphere microbial community relative to the bulk soil community. However, we show that because the bulk soil has greater capacity to form mineral-stabilized soil carbon due to its greater overall volume, the relative contributions of aboveground versus belowground carbon inputs depend strongly on the ratio of rhizosphere to bulk soil. © 2018, The Author(s), under exclusive licence to Springer Nature Limited. 资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122646
Appears in Collections: 气候变化事实与影响
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作者单位: Yale University, School of Forestry & Environmental Studies, New Haven, CT, United States; Lawrence Livermore National Laboratory, Physical and Life Sciences Directorate, Livermore, CA, United States
Recommended Citation:
Sokol N.W.,Bradford M.A.. Microbial formation of stable soil carbon is more efficient from belowground than aboveground input[J]. Nature Geoscience,2019-01-01,12(1)