黄土丘陵区侵蚀坡面CO<sub>2</sub>通量空间分异格局驱动机制

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Abstract On eroded slopes with different soil organic carbon (SOC) levels in loess hilly region, the spatial differentiation patterns driving factors and process mechanisms of CO₂ fluxes were analyzed, and a subsection model of CO₂ fluxes was constructed. The results showed that: (1) The spatial differentiation patterns of soil CO₂ flux on slopes caused by erosion was as follows: sedimentary area (S) > control area (CK) > eroded area (E); the increase of SOC level can promote the increase of CO₂ flux in all parts of slope. (2) The erosion reduced soil moisture, bulk density and aggregate stability, cause soil nutrient loss, reduce bacteria diversity and fungal diversity; sedimentation caused the opposite phenomenon. The effect of erosion/sedimentation process on soil temperature was not significant. The increase of SOC level can effectively improve soil particles, soil moisture, increase bulk density, inhibit soil nutrient loss, increase bacteria diversity but reduce fungal diversity. (3) Our structural equation model analyzed the multi-factor driving mechanism of erosion location, soil temperature, soil moisture, SOC, DOC, SMBC, fungal diversity and bacterial diversity on CO₂ flux (R²=77%). Our model also identified soil temperature, soil moisture and SMBC as the direct influencing factors of CO₂ flux. Based on the two-factors hydrothermal model, the T&M&C model was built by embedding the C factor which could indirectly represent the microbial activity and available carbon substrate, thus allowing to estimate more accurately the CO₂ flux in different parts of the erosion slope (R²>67%).

Key words： CO₂ flux eroded slope SOC level structural equation model driving mechanism

Received: 07 May 2021

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X171.1

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	HAO Wang-lin
	XIA Bin
	XU Ming-xiang

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HAO Wang-lin,XIA Bin,XU Ming-xiang. Driving mechanism of spatial differentiation patterns of CO₂ flux on eroded slope in loess hilly region[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(12): 5875-5884.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I12/5875

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