神木县近10年生态治理效果评价

Study of Land Use Change in Shenmu County Based on RS & GIS

根据1986年和2000年2期TM影像解译资料,运用地理信息系统的空间分析和数理统计功能以及景观分析软件FRAGSTATS分析了神木县土地利用变化的数量变化、变化速度等特征,以及各类型之间的转化情况和景观指标变化特点。结果表明:15年间,神木县土地整治取得明显成绩,土地利用类型发生明显变化,耕地、草地分别增加5161.11hm2和56462.25hm2;未利用地减少60456.25hm2;各类型间的转化突出表现为未利用地向草地的转化;景观指标变化分析表明景观结构异质程度下降,景观类型有向单一化方向发展的趋势。

This paper takes Shenmu county as an example. Shenmu county is located in the northern-most part of Yulin prefecture. It covers an area of 7 635 km^2. Depending on 1986 and 2000 TM images and other data, we achieved the land-use change data after interpretation. This paper analyzed the situation of land-use change in temporal and spatial aspects with the GIS and statistic methods. Then this paper analyzed the situation of landscape change with FRAGSTATS 3.3. The results show that: in recent 15 years the cultivated land and the grassland increased by 5 161.11 hm^2 and 56 462.25 hm^2 respectively, the non-used land decreased by 43 763.01 hm^2,the change rate of non-used land is most high. In the direction of land-use change the conversion from non-used land to grassland land and forestland is prominent. The results also show that the landscape structure changed dramatically during the past 15 years. The decrease of Shannon's diversity index and evenness index manifested that the landscape heterogeneity and landscape diversity decreased. The land conservation works well in recent years.