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Does Erosion Increase or Decrease Co Emission on Slopes

SSRN, ISSN: 1556-5068
2022
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  • Usage
    241
    • Abstract Views
      201
    • Downloads
      40

Article Description

There is still much controversy about the effect of CO emission induced by soil erosion on plots as well as regional scale. Erosion changes the soil water and heat environment and soil quality further influencing the soil CO emissions. However, whether soil erosion increased or decreased CO emissions is unclear, which leaves a large knowledge gap on estimation of carbon emissions under soil erosion. Here we have monitored the changes of soil water and heat environment and their effects on CO emissions at different sites of the eroded slope in the hilly loess region for two years continuous monitoring. Data from 60 scenarios that differed based on the sites, seasons and soil organic carbon (SOC) levels were assessed to compare spatial and temporal characteristics of soil respiration. By monitoring the soil water content, temperature, bulk density, SOC, total nitrogen and microbial biomass carbon (MBC) content along bare eroded slopes, the limit factors influencing soil respiration at different sites were determined. The results showed that the soil water and heat environment was seasonal variated and related to SOC levels as well as the sites of the slope. Soil respiration increased with the SOC levels and was ordered as sedimentary sites > control sites > erosion site, and summer > spring > autumn > winter. Interestingly, soil erosion not always increased CO emissions at sedimentary sites and decreased CO emission rates at erosion sites. When soil temperature and water content increase to about 33 ℃ and 22%, the erosion sites will convert from reducing to increasing CO emissions compared to the control sites. For the sedimentary site, it mainly increased extra CO emissions when the soil water content exceeded 8%. Notably, the increase of CO annual emissions caused by erosion is from +1.83 to +5.93 t∙ha∙year at high SOC level slopes and the decrease is from -0.57 to -2.47 t∙ha∙year at lower SOC level slopes. Our study indicates that soil erosion and seasonal variation were important influencing factors for the spatial and temporal distribution of soil heat, water and SOC on the eroded slopes.The differences in the response of the soil CO emission to the different influencing factors was mainly due to the restrictive conversion of the different factors. The study identified the threshold of conversion from reducing to increasing CO emissions on the eroded slopes. The results revealed the mechanism and the trigger regulating CO emissions on the eroded slopes, which provided critical support for soil emission assessment in eroded environment.

Bibliographic Details

Bin Xia; Wanglin Hao; Jinshi Jian; Yibin Liu; Changwu Cheng; Binbin Li; Mingxiang Xu

Elsevier BV

Multidisciplinary; Soil erosion; CO2 emission; eroded slope; hilly loess region

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