摘 要：
在蒋家沟流域内选择50个样地,对样地内地形地貌及土壤因子做主成分分析,根据主成分分析结果,将影响水热分配的海拔、坡向因子作为蒋家沟流域立地类型组划分的依据,共得到高山阳坡、高山阴坡、中山阳坡、中山阴坡、低山阳坡、低山阴坡6个立地类型组。在地理信息系统支持下,对不同立地类型组中不同土地利用类型的面积进行分析,结果表明:在整个蒋家沟流域中,不同土地利用类型所占流域面积百分比的大小依次为农耕地>草本>灌草>河滩地>滑坡>乔草>乔灌草>乔木。在低山阳坡立地类型组中,低覆盖率的灌草、草本植被覆盖类型占该立地类型组的很大部分,由乔木构成的植被覆盖类型仅占0.03%;在低山阴坡立地类型组中,以中、低覆盖率的灌草、草本植被覆盖类型为主,由乔木构成的植被覆盖类型为2.24%;在中山阳坡立地类型组中,低覆盖率的灌草、草本植被覆盖类型占该立地类型组的很大部分,有乔木构成的植被覆盖类型占13.66%;在中山阴坡立地类型组中,以中、高覆盖率的灌草、草本植被覆盖类型为主,由乔木构成的植被覆盖类型占21.93%;在高山阳坡立地类型组中,以低覆盖率的灌草和中、高覆盖率的草本植被覆盖类型为主,由乔木构成的植被覆盖类型占15.12%;在高山阴坡立地类型组中,以中、高覆盖率的灌草、草本植被覆盖类型为主,有乔木构成的植被覆盖类型占34.79%。实验结果对流域泥石流生物防治布局规划,减少泥石流灾害,改善流域生态环境有积极的指导意义。
译 名：
Research on the Site Condition Classification and Analysis of Present Status of Land-using in Jiangjia Ravine
作 者：
XIE Xian-jian et al(Key Laboratory of Mountain Hazards and Surface Process,Chinese Academy of Sciences,Chengdu,Sichuan 610041)
关键词：
Principal component analysis;Site type classification;Land-using
摘 要：
In Jiangjia ravine,50 samples including factors such as topographic and soil factors were selected to do the principal component analysis.According to the results of analysis,the altitude and slope were the key factors which influenced the distribution of water and quantity of heat,so they were selected as the bases to classify site-type group.Six site type groups including the high-mountain and south-facing-slope,the high-mountain and north-facing-slope,the middle-mountain and south-facing-slope,the middle-mountain and north-facing-slope,the low-mountain and south-facing-slope,the lowmountain and north-facing-slope site type groups were gained.Based on GIS,the area distribution of different land-use types at different site-type groups was analyzed and the results showed that the order of the area percentage of different land-use types in the ravine was plow land type > grass type > shrub + grass type > bottomland type > landslide without coverage type > forest + grass type > forest + shrub + grass type > forest type.In the low-mountain and south-facing site-type group,the area of shrub + grass type and grass type with low coverage rate had large percentage in the group,and the vegetation type with forest had 0.03% of the area of group.In the low-mountain and north-facing site-type group,the area of shrub + grass type and grass type with middle and low coverage rate had large percentage,and the vegetation type with forest had 2.24% of the area of group.In the middle-mountain and south-facing site-type group,the area of shrub + grass type and grass type with low coverage rate had large percentage,and the vegetation type with forest had 13.66% of the area of group.In the middle-mountain and north-facing site-type group,the area of shrub + grass type and grass type with middle and high coverage rate had large percentage,and the vegetation type with forest has 21.93% of the area of group.In the high-mountain and south-facing site-type group,the area of shrub + grass type with low coverage rate and grass type with middle and high coverage rate had large percentage,and the vegetation type with forest has 15.12% of the area of group.In the high-mountain and north-facing site-type group,the area of shrub + grass type and grass type with middle and high coverage rate had large percentage,and the vegetation type with forest has 34.79% of the area of group.According to the results,it had a positive guidance to control and reduce debris flow disaster by the use of the bioengineering as well as improve the ecological environment in the ravine.
