摘要
文章以辽西低山丘陵区大栗小流域为例,在GIS空间分析技术支持下利用修正的RUSLE方程定量估算了流域土壤侵蚀强度及其与土地利用类型、不同坡度之间的关系。结果表明:0-35°坡度范围内,坡耕地、林地、沟渠和道路占土地利用总面积82.85%、10.98%、0.77%、5.41%;2020年流域属于轻度侵蚀,平均土壤侵蚀速率22.87t/(hm^(2)·a)达到规定允许流失量5t/(hm^(2)·a)的4.6倍;5-25°坡度范围内,流域土壤侵蚀集中属重点预防治理区;从用地类型上,林地的土壤侵蚀速率最高达到53.67t/(hm^(2)·a),达到沟渠、坡耕地、道路的25.80倍、2.81倍、2.56倍。将处理数据和相关参数输入软件,即可利用RUSLE方程估算出不同用地类型、坡度的土壤侵蚀强度及其分布特征,为流域内道路、林地、坡耕地等用地类型的合理规划利用提供一定数据支持。
Taking Dali watershed in the hilly region of western Liaoning Province as an example,soil erosion intensity and its relationship with different land use types were quantitatively estimated by using modified RUSLE equation with the support of GIS spatial analysis technology.The results showed that in the range of slope from 0°to 35°,forest ditches and roads accounted for 82.85%,10.98%,0.77%and 5.41%of the total land use area;in 2020,the watershed was slightly eroded,and the average soil erosion rate was 22.87t/(hm^(2)·a),which was 4.6 times of the allowable loss of 5t/(hm^(2)·a);in the range of slope between 5 and 25,the concentrated soil erosion is a key prevention and control area.In terms of land use type,the highest soil erosion rate of forest land was 53.67t/(hm^(2)·a),which was 25.80 times,2.81 times,and 2.56 times of that of ditched sloping farmland.By inputting the processing data and related parameters into the software,the RUSLE equation can be used to estimate the soil erosion intensity and distribution characteristics of different land use types,which can provide some data support for the rational planning and utilization of road,forest,slope farmland and other land use types in the basin.
作者
刘伟
LIU Wei(Suizhong County Water Conservancy Affairs Service Center, Huludao 125200, China)
出处
《黑龙江水利科技》
2022年第6期72-76,共5页
Heilongjiang Hydraulic Science and Technology