Managing Agroecosystems for Soil Microbial Carbon Use Efficiency: Ecological Unknowns, Potential Outcomes, and a Path Forward

被引:100
|
作者
Kallenbach, Cynthia M. [1 ,2 ]
Wallenstein, Matthew D. [1 ,3 ]
Schipanksi, Meagan E. [1 ]
Grandy, A. Stuart [4 ]
机构
[1] Colorado State Univ, Dept Soil & Crop Sci, Ft Collins, CO 80523 USA
[2] McGill Univ, Nat Resource Sci, Ste Anne De Bellevue, PQ, Canada
[3] Colorado State Univ, Nat Resource Ecol Lab, Ft Collins, CO 80523 USA
[4] Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA
来源
FRONTIERS IN MICROBIOLOGY | 2019年 / 10卷
基金
美国食品与农业研究所;
关键词
soil ecology; carbon sequestration; CUE; agriculture; microbial biomass; crop diversity; tillage; SUBSTRATE USE EFFICIENCY; COMMUNITY COMPOSITION; LITTER DECOMPOSITION; ORGANIC-MATTER; GROWTH-RATE; STOICHIOMETRY; PHYSIOLOGY; FRAMEWORK; MICROORGANISMS; FACILITATION;
D O I
10.3389/fmicb.2019.01146
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Agricultural systems are increasingly managed for improving soil carbon (C) accumulation. However, there are limits to C returns in agricultural systems that constrain soil C accumulation capacity. Increasing the efficiency of how soil microbes process C is gaining interest as an important management strategy for increasing soil C and is a key feature of soil C dynamics in many new microbial-explicit models. A higher microbial C use efficiency (CUE) may increase C storage while reducing C system losses and is a fundamental trait affecting community assembly dynamics and nutrient cycling. However, the numerous ecological unknowns influencing CUE limit our ability to effectively manage CUE in agricultural soils for greater soil C storage. In this perspective, we consider three complex drivers of agroecosystem CUE that need to be resolved to develop effective C sequestration management practices in the future: (1) the environment as an individual trait moderator versus a filter, (2) microbial community competitive and faciliatory interactions, and (3) spatiotemporal dynamics through the soil profile and across the microbial lifecycle. We highlight ways that amendments, crop rotations, and tillage practices might affect microbial CUE conditions and the variable outcomes of these practices. We argue that to resolve some of the unknowns of CUE dynamics, we need to include more mechanistic, trait-based approaches that capitalize on advanced methods and innovative field research designs within an agroecosystem-specific context. By identifying the management-level determinants of CUE expression, we will be better positioned to optimize CUE to increase soil C storage in agricultural systems.
引用
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页数:8
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