摘要:
以文山州作为研究对象,选取2008年TM和2014年高分一号、资源三号和遥感二号2期卫星遥感数据为数据源,采用RS和GIS技术,获取石漠化面积变化情况,探索文山州石漠化时空演变特征及成因分析.结果表明,2008—2014年间文山州石漠化总面积减少1796.41 km2,石漠化类型多由重度转为中度,除西畴、麻栗坡和丘北外石漠化面积均有所减少;距构造断裂带0.5 km范围内、碳酸盐岩、较陡坡(15°~25°)、人口密度较大及距矿山开采活动50 m范围内文山州石漠化发育率最高.在距离构造断裂带0.5 km范围内、碳酸盐岩、较陡坡(15°~25°]、人口密度较大及距矿山开采活动50 m范围内等石漠化易发地段应优先采取石漠化防治措施,并处理好人地关系,可较好地防止人为因素诱发和加剧石漠化发展.
Abstract:
Wenshan Prefecture is one of the most developed areas of rocky desertification in eastern Yunnan. The process of rocky desertification has always been widely concerned by experts both in China and abroad. In this paper, using Wenshan Prefecture as the research object, selecting the remote sensing data of TM in 2008 and GF-1, ZY-3,YG-2 in 2014 as data source, employing RS and GIS technology, rocky desertification status data are extracted. The temporal and spatial evolution characteristics of rocky desertification and cause analysis in Wenshan State were explored. The results show that the rocky desertification area of Wenshan Prefecture was reduced by 1796. 41 km2 from 2008 to 2014, the type of rocky desertification dominated by Wenshan Prefecture was changed from heavy to moderate, and rock desertification area decreased except for Xichou, Malipo and Qiubei, and that the highest rate of rocky desertification in Wenshan Prefecture was within 0. 5 km from the tectonic fault zone, in carbonate rock and clastic rock areas, on steep slopes (15 °,25 °], in areas with large population density and within 50 m from mining activities. In the rocky desertification prone areas, we should give priority to doing rocky desertification control measures, dealing with the relationship between man and land, and preventing human factors from inducing and aggravating rocky desertification development.
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