摘要
采用GIS技术制作出专题坡度面积统计表,得到金沙江宜宾段河段两岸10km范围内15°～25°的坡度区域占最大比例,河段两岸坡度范围主要是25°～35°;由当地土肥站、国土局、林业局、气象站等调查资料得知:研究区处于四川山地丘陵区,年平均降水量950mm左右;坡耕地占坡地面积平均为12.85%;平均植被覆盖率为23.63%;岩性主要为紫红色砂页岩、泥页岩;土壤主要为紫色土、水稻土,河谷属于平丘潮泥紫泥土;地表松散物质厚度处在1～5m范围,人均占有土地资源量非常低,人口环境容量失衡度极高.根据土壤侵蚀潜在危险度评级标准,确定金沙江宜宾段土壤侵蚀潜在危险度为强险型.提出了减轻土壤侵蚀潜在危险度的几点建议.
A special slope area statistics was made by using GIS technology.It show that the 15°~ 25° slope area is the largest proportion on 10 km of both sides on Yibin section of Jinsha River,and the main slope range from 25° to 35°.The summing data of the local soil-fertilization station,the land bureau,the forestry bureau and the weather station display that： the study area is located in Sichuan hilly;the average annual rainfall is about 950 mm;the mean proportion of slope plowland is 12.85% of slope;the average vegetation coverage is 23.63%;the main lithology is purple-red sand shale and clay shale;the main soil type is purple soil and paddy soil;the valley is plain-hill wattenschlick purple mud;the thickness of surface loose material is 1~5 m range,the per capita possession of land resources is very low,the population environmental capacity imbalances degree is high.According to the national soil erosion potential risk evaluation standard,the conclusion is elicited that the potential risk type of Yibin section of Jinsha River is strong-dangerous one.And some suggestions to reducing soil erosion potential danger are given.
出处
《宜宾学院学报》
2012年第12期81-84,共4页
Journal of Yibin University
