Erosion has an indirect impact on CO2 flux through its effects on soil temperature, soil moisture, and soil SOC content, all of which affect soil respiration. In depositional slope positions, deposited organic-rich topsoil has higher water holding capacity and higher soil moisture content and lower temperature due to shading by lush vegetation; soils above some threshold moisture content have diminished mineralization rates (Liu et al., 2003; Smith et al., 2005). Van Hemelryck et al.(2011) studied the effect of erosion on C mineralization by measuring CO2 flux in a field after a rain and by incubating undisturbed soil cores in laboratory. The data confirm that CO2 flux in arable fields is indeed regulated by a complex interplay of several factors. There is little research about the short-term effect of soil temperature and soil moisture on C respiration after a heavy rain; moreover, the related laboratory experiments cannot simulate the condition of farmland environment well(Van Hemelryck et al., 2010).
Erosion has an indirect impact on CO2 flux through its effects on soil temperature, soil moisture, and soil SOC content, all of which affect soil respiration. In depositional slope positions, deposited organic-rich topsoil has higher water holding capacity and higher soil moisture content and lower temperature due to shading by lush vegetation; soils above some threshold moisture content have diminished mineralization rates (Liu et al., 2003; Smith et al., 2005). Van Hemelryck et al.(2011) studied the effect of erosion on C mineralization by measuring CO2 flux in a field after a rain and by incubating undisturbed soil cores in laboratory. The data confirm that CO2 flux in arable fields is indeed regulated by a complex interplay of several factors. There is little research about the short-term effect of soil temperature and soil moisture on C respiration after a heavy rain; moreover, the related laboratory experiments cannot simulate the condition of farmland environment well(Van Hemelryck et al., 2010).
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