Effects of elevated CO concentrations on soil microbial respiration and root/rhizosphere
respiration in forest soils

doi:10.1007/s11461-008-0027-6

Front. For. China

2008, Vol. 3

Issue (2) : 131-138 https://doi.org/10.1007/s11461-008-0027-6

Effects of elevated CO concentrations on soil microbial respiration and root/rhizosphere respiration in forest soils

ZHOU Yumei¹, HAN Shijie¹, ZHENG Junqiang¹, ZHANG Haisen¹, XIN Lihua²

1.Institute of Applied Ecology, Chinese Academy of Sciences; 2.College of Land and Environment, Shenyang Agricultural University

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Abstract The two main components of soil respiration, i.e., root/rhizosphere and microbial respiration, respond differently to elevated atmospheric CO₂ concentrations both in mechanism and sensitivity because they have different substrates derived from plant and soil organic matter, respectively. To model the carbon cycle and predict the carbon source/sink of forest ecosystems, we must first understand the relative contributions of root/rhizosphere and microbial respiration to total soil respiration under elevated CO₂ concentrations. Root/rhizosphere and soil microbial respiration have been shown to increase, decrease and remain unchanged under elevated CO₂ concentrations. A significantly positive relationship between root biomass and root/rhizosphere respiration has been found. Fine roots respond more strongly to elevated CO₂ concentrations than coarse roots. Evidence suggests that soil microbial respiration is highly variable and uncertain under elevated CO₂ concentrations. Microbial biomass and activity are related or unrelated to rates of microbial respiration. Because substrate availability drives microbial metabolism in soils, it is likely that much of the variability in microbial respiration results from differences in the response of root growth to elevated CO₂ concentrations and subsequent changes in substrate production. Biotic and abiotic factors affecting soil respiration were found to affect both root/rhizosphere and microbial respiration.

Issue Date: 05 June 2008

Cite this article:

HAN Shijie,ZHOU Yumei,ZHENG Junqiang, et al. Effects of elevated CO concentrations on soil microbial respiration and root/rhizosphere respiration in forest soils[J]. Front. For. China, 2008, 3(2): 131-138.

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https://academic.hep.com.cn/ffc/EN/10.1007/s11461-008-0027-6
https://academic.hep.com.cn/ffc/EN/Y2008/V3/I2/131

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