期刊
FUNCTIONAL ECOLOGY
卷 36, 期 6, 页码 1396-1410出版社
WILEY
DOI: 10.1111/1365-2435.14014
关键词
amino sugars; destabilization; microbial necromass continuum; necromass recycling; persistence; soil carbon sequestration; stabilization
类别
资金
- Natural Environment Research Council [NE/R016429/1, NE/S005137/1]
- U.S. Geological Survey Climate RD Program [ZT00U4U30]
- NERC [NE/S005137/1] Funding Source: UKRI
Looking at the necromass continuum, three conclusions are drawn for future research. Firstly, controls on necromass persistence become clearer when viewed through the continuum's lens; secondly, destabilization is the least understood stage with recycling also insufficiently evidenced in many ecosystems; and thirdly, the response of necromass process rates to climate change remains unresolved for most continuum stages and ecosystems.
1. Microbial necromass is a large, dynamic and persistent component of soil organic carbon, the dominant terrestrial carbon pool. Quantification of necromass carbon stocks and its susceptibility to global change is becoming standard practice in soil carbon research. However, the typical proxies used for necromass carbon do not reveal the dynamic nature of necromass carbon flows and transformations within soil that ultimately determine necromass persistence. In this review, we define and deconstruct four stages of the necromass continuum: production, recycling, stabilization and destabilization. 2. Current understanding of necromass dynamics is described for each continuum stage. We highlight recent advances, methodological limitations and knowledge gaps which need to be addressed to determine necromass pool sizes and transformations. We discuss the dominant controls on necromass process rates and aspects of soil microscale structure including biofilms and food web interactions. The relative importance of each stage of the continuum is then compared in contrasting ecosystems and for climate change drivers. 3. From the perspective of the continuum, we draw three conclusions to inform future research. First, controls on necromass persistence are more clearly defined when viewed through the lens of the continuum; second, destabilization is the least understood stage of the continuum with recycling also poorly evidenced outside of a few ecosystems; and third, the response of necromass process rates to climate change is unresolved for most continuum stages and ecosystems. 4. Future mechanistic research focused on the role of biotic and abiotic soil microscale structure in determining necromass process rates and the relative importance of organo-mineral and organo-organo interactions can inform necromass persistence in different climate change scenarios. Our review demonstrates that deconstructing the necromass continuum is key to predicting the vulnerability and persistence of necromass carbon in a changing world.
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