IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Soil Hydrological Properties as a Response to Tillage Erosion in a Regosol of Hilly Landscapes
Jianhui Zhang; Yong Wang
Corresponding AuthorJianhui Zhang
Source PublicationThe 20th World Congress of Soil Science ; 20th WORLD CONGRESS OF SOIL SCIENCE
Conference Date2014-6-8~13
Conference PlaceJeju, Korea
Funding Organization国际土壤学会
Abstractwo or more processes of soil erosion simultaneously exist in a hillslope landscape, and those processes may interact with each other. Yet, how one process impacts another one remains unresolved. Five slopes were selected from hilly areas of the Sichuan Basin, China to explore the mechanism of tillage erosion impacts on water erosion. On those slopes, soil hydrological properties with reference to water erosion were examined in different landscape positions with discrepant intensities of tillage erosion. The Cs-137 data showed that the most severe erosion occurred in upper slope positions, and there was a decreasing pattern of soil erosion from upper, middle, to lower slope positions. Tillage erosion ranging from 80 to 125 t ha-1 yr-1 mostly contributed to total soil loss in upper slope positions. Contrarily, substantial soil deposition by tillage with deposition rates of -67 to -120 t ha-1 yr-1 was present in lower slope positions, whereas only slight erosion or deposition occurred, with rates of -12 to 4 t ha-1 yr-1 in middle slope positions. The drastic differences in total soil depth were observed among different landscape positions, averagely being 17, 28, and 39 cm deep for upper, middle, and lower slope positions, largely due to tillage erosion. Soil water storage capacity (SWSC) at saturation exhibited remarkable differences among different landscape positions as a result of substantial variations in total soil depth. The lowest steady-state infiltration rates were found in tillage-eroded areas (upper slopes) with a mean of 1.01 mm min-1, followed by deposited areas (lower slope) with a mean of 1.67 mm min-1, while the largest steady-state infiltration rates were observed in the balanced areas between soil loss and gain (middle slope) with a mean of 2.00 mm min-1. Thickness of soil profiles
and local slope gradients were found to be two important determinants of soil infiltrability. It is suggested that soil degradation by tillage erosion alters soil hydrological properties, thereby resulting in poor soil infiltrability which may enhance overland water flow in relation to water erosion.
KeywordSoil Hydrological Property Soil Infiltrability Soil Water Storage Capacity Tillage Erosion Landscape Position Steep
Document Type会议论文
Corresponding AuthorJianhui Zhang
Recommended Citation
GB/T 7714
Jianhui Zhang,Yong Wang. Soil Hydrological Properties as a Response to Tillage Erosion in a Regosol of Hilly Landscapes[C],2014:180-180.
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