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DOI | 10.1038/s41561-018-0258-6 |
Microbial formation of stable soil carbon is more efficient from belowground than aboveground input | |
Sokol, Noah W.1,2; Bradford, Mark A.1 | |
2019 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2019 |
卷号 | 12期号:1页码:46-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000454010200010 |
WOS关键词 | DISSOLVED ORGANIC-CARBON ; NO-TILL CORN ; MATTER FRACTIONS ; ACID-HYDROLYSIS ; PLANT INPUTS ; ROOT ; STABILIZATION ; DYNAMICS ; RHIZOSPHERE ; FOREST |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34995 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA; 2.Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94550 USA |
推荐引用方式 GB/T 7714 | Sokol, Noah W.,Bradford, Mark A.. Microbial formation of stable soil carbon is more efficient from belowground than aboveground input[J]. NATURE GEOSCIENCE,2019,12(1):46-+. |
APA | Sokol, Noah W.,&Bradford, Mark A..(2019).Microbial formation of stable soil carbon is more efficient from belowground than aboveground input.NATURE GEOSCIENCE,12(1),46-+. |
MLA | Sokol, Noah W.,et al."Microbial formation of stable soil carbon is more efficient from belowground than aboveground input".NATURE GEOSCIENCE 12.1(2019):46-+. |
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