摘要:
基于2013年9月29日GF-1号WFV遥感数据对南洞地下河流域蒙自幅、个旧幅、新安幅和鸣鹫幅进行岩溶石漠化遥感解译,通过归一化植被指数(NDVI)和植被覆盖度(FVC)提取研究区域内石漠化信息,得到其空间分布规律.研究区岩溶石漠化发生率74.55%,属石漠化高发地区,其中中度石漠化最为发育,占全区石漠化的32.63%,重度石漠化最少,占17.59%.基于岩性、高程、坡向和坡度等4个影响因素与岩溶石漠化进行相关性分析,对不同因素中石漠化发生率的变化规律进行分析,结果表明南洞地下河流域南部区域岩溶石漠化在低海拔、缓坡度和纯碳酸盐岩中较为发育,在不同坡向中岩溶石漠化发育程度则较为相似.
Abstract:
Based on the GF-1 WFV remote sensing data of September 29,2016,we carried out a Karst Rocky Desertification (KRD) remote sensing survey in the southern Nandong underground river drainage.Using the Normalized Difference Vegetation Index (NDVI) and Fractional Vegetation Index (FVC) we extracted the KRD information on KRD,obtaining its distribution pattern in the research region.The results show that the KRD occurrence ratio reaches 74.55%,indicative of a high degree of KRD.In this area,moderate KRD is most developed,with proportion of 32.63%.The serious KRD is the least ratio,only 17.59%.We made an analysis of the correlation between KRD and four factors,i.e.lithology,elevation,slope and aspect,yielding the KRD occurrence changing regularities to each factor.The results show that KRD developed relatively well in the places of the low altitude,gentle slopes and the pure carbonate,while different aspects have no significant correlation with KRD generation.
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