基于NDVI喀斯特石漠化治理效果评价

来源:用户上传      作者:杨昌红 马士彬 高南 杨雪萃

　　摘 要：石漠化是导致喀斯特地区生态恶化的因素之一，监测评估其演变状况，对石漠化的防治具有重要的研究意义。该研究利用花江1987―2019年NDVI数据，2000年、2010年、2018年石漠化数据，应用Mann-Kendall非参数检验方法分析NDVI变化趋势，在此基础上探究不同等级石漠化转移情况，分析其转移过程中NDVI的变化规律。结果表明：（1）30年来花江研究区NDVI年平均值整体呈现上升变化趋势。1987―1998年、1998―2010年、2010―2019年分别呈现“增-快增-降”的变化模式。（2）2000―2010年石漠化改善的面积为20.63km2，极重度和重度石漠化面积改善显著，2010―2018年石漠化改善的面积为13.31km2，潜在石漠化面积增加显著。（3）2000―2010年石漠化发生转移的NDVI变化趋势以弱显著上升和显著上升为主，分别占总面积的42.64%、16.45%;2010―2018年石漠化发生转移的NDVI变化趋势以弱显著下降和弱显著上升为主，分别占总面积的17.25%、11.56%。石漠化的程度与NDVI变化趋势的关系为负相关。
　　关键词：石漠化;治理效果;NDVI;Mann-Kendall;花江
　　中图分类号 P642.25 文献标识码 A 文章编号 1007-7731（2022）03-0144-07
　　Abstract： Rocky desertification is one of the factors leading to ecological deterioration in karst areas. Monitoring and evaluating its evolution has important research significance for the prevention and control of rocky desertification. This paper uses the Landsat series of remote sensing images from 1987 to 2019 to calculate the Huajiang Normalized Difference Vegetation Index， uses 2000 and 2010 TM remote sensing images， and 2018 Google high-definition remote sensing images as data sources to extract rocky desertification information; apply Mann-Kendall non-parametric test method analyzes the changing trend of NDVI， on this basis， explores the transfer of different grades of rocky desertification， and analyzes the variation of NDVI in the process of metastasis. The research results show that： （1）The annual average value of NDVI in the Huajiang study area has fluctuated greatly in the past 30 years， and the overall trend has been increasing， with an increase rate of 0.0014， which is relatively slow. 1987-1998， 1998-2010， and 2010-2019 showed a change pattern of "increase-rapid increase-decrease" respectively. （2）The area of ??rocky desertification improved from 2000 to 2010 was 20.63 km2， and the area of ??extremely severe and severe rocky desertification improved significantly. From 2010 to 2018， the area of ??rocky desertification improved was 13.31 km2， and the area of potential rocky desertification increased significantly. （3）The change trend of NDVI for rocky desertification transfer from 2000 to 2010 is mainly a weakly significant increase and a significant rise， accounting for 42.64% and 16.45% of the total area， respectively. The NDVI trend for rocky desertification transfer from 2010 to 2018 Weakly significant decline and weakly significant increase are the main ones， accounting for 17.25% and 11.56% of the total area respectively. The degree of rocky desertification has a negative correlation with the changing trend of NDVI.

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