Soil Hydrological Properties as a Response to Tillage Erosion in a Regosol of Hilly Landscapes

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 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
	Yong Wang
	2014-06
会议名称	The 20th World Congress of Soil Science
会议日期	2014-6-8~13
会议地点	Jeju, Korea
关键词	Soil hydrological property soil infiltrability soil water storage capacity tillage erosion landscape position steep
页码	180-180
通讯作者	Jianhui Zhang
英文摘要	wo 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.
会议主办者	国际土壤学会
会议网址	http://www.dbpia.co.kr/Journal/ArticleList/156295
会议录	20th WORLD CONGRESS OF SOIL SCIENCE
语种	英语
内容类型	会议论文
源URL	[http://ir.imde.ac.cn/handle/131551/7844]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
推荐引用方式 GB/T 7714	Yong Wang. Soil Hydrological Properties as a Response to Tillage Erosion in a Regosol of Hilly Landscapes[C]. 见:The 20th World Congress of Soil Science. Jeju, Korea. 2014-6-8~13.http://www.dbpia.co.kr/Journal/ArticleList/156295.