Effects of soil organism interactions and temperature on carbon use efficiency in three different forest soils
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https://doi.org/10.1007/s42832-020-0067-x
RESEARCH ARTICLE
Effects of soil organism interactions and temperature on carbon use efficiency in three different forest soils Simin Wang1,2, Xiaoyun Chen3, Debao Li1,2, Jianping Wu1,2 ,* 1 Yunnan Key Laboratory of Plant Reproductive Adaptation and Evolutionary Ecology, Yunnan University, Kunming 650500, China 2 School of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China 3 Soil Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
HIGHLIGHTS
GRAPHICAL
ABSTRACT
• Three typical forest soils and three soil organisms were collected. • Interactions among soils and organisms were examined by incubation experiment. • Biotic factors mainly affect microbial CUE by changing biomass. • Temperature regulates microbial CUE by affecting microbial respiration.
ARTICLE INFO Article history: Received June 9, 2020 Revised September 17, 2020 Accepted September 23, 2020 Keywords: Biotic interactions Carbon use efficiency Climate gradients Soil carbon cycle Soil organisms Soil respiration
ABSTRACT Microbial carbon use efficiency (CUE) affects the soil C cycle to a great extent, but how soil organisms and the abiotic environment combine to influence CUE at a regional scale remains poorly understood. In the current study, microcosms were used to investigate how microbial respiration, biomass, and CUE responded to biotic and abiotic factors in natural tropical, subtropical, and temperate forests. Soil samples from the forests were collected, sterilized, and populated with one or a combination of three types of soil organisms (the fungus Botrytis cinerea, the bacterium Escherichia coli, and the nematode Caenorhabditis elegans). The microcosms were then kept at the mean soil temperatures of the corresponding forests. Microbial respiration, biomass, and CUE were measured over one-month incubation period. The results showed that microbial biomass and CUE were significantly higher, but microbial respiration lower in the subtropical and temperate forest soils than in tropical forest soil. Biotic factors mainly affected CUE by their effect on microbial biomass, while temperature affected CUE by altering respiration. Our results indicate that temperature regulates the interactive effects of soil organisms on microbial biomass, respiration, and CUE, which would provide a basis for understanding the soil C cycle in forest ecosystems. © Higher Education Press 2020
1 Introduction Soil contains the largest carbon (C) pool in terrestrial ecosystems (Lal, 2004). Carbon emissions from the soil
* Corresponding authors E-mail address: [email protected] (J. Wu)
make a significant contribution to the atmospheric CO2 concentration and therefore to global climate change (Melillo et al., 2017; Fang et al., 2018). The terrestrial C cycle is a vital biogeochemical cycle in which forest soils are especially important (Tang et al., 2018; Piao et al., 2020; SandersDeMott et al., 2020). Processes belowground are sensitive to e
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