基于NDVI数据的陇南市植被覆盖度时空演变  

Spatiotemporal Evolution of Vegetation Coverage in Longnan City Based on NDVI Data

作　　者：金雅铖 卫亚星[1] Jin Yacheng;Wei Yaxing(College of Geographical Sciences,Liaoning Normal University,Dalian 116029,Liaoning,China)

机构地区：[1]辽宁师范大学地理科学学院,辽宁大连116029

出　　处：《绿色科技》2024年第9期206-211,227,共7页Journal of Green Science and Technology

摘　　要：为研究陇南市的植被覆盖变化,基于2001—2020年归一化差异植被指数数据,采用像元二分模型最大值合成植被覆盖度,通过趋势分析、显著性检验,Hurst指数等方法,系统地分析甘肃省陇南市近20年来植被覆盖度的时空演化特征,并对其发展趋势进行预测。结果表明:①陇南市植被覆盖度整体呈现出一个波动性的上升趋势,变化速率在(-0.0417208~0.0479985)/a;②不同地区的植被覆盖度稳定性存在明显的差异,其中植被覆盖稳定不变区域占比7.26%,明显改善区域占比31.12%,严重退化区域占比9.39%;③在植被覆盖演变过程中,持续性和反持续性呈现出交错的分布模式,总体上主要呈现为弱持续性的序列。研究结果可为陇南市生态环境的修复和保护工作提供参考依据。In order to study the vegetation cover change in Longnan City,based on the Normalized Difference Vegetation Index(NDVI)data from 2001 to 2020,this paper used the maximum composite Fractional Vegetation Cover(FVC)of the pixel dichotomous model,and systematically analyzed the spatiotemporal evolution characteristics of vegetation coverage in Longnan City,Gansu Province in the past 20 years by Sen trend analysis,Mann-Kendall significance test,Hurst index and other methods,and predicted its development trend.The results showed that:①The vegetation coverage in Longnan City showed a fluctuating upward trend as a whole,with a change rate ranging from(-0.0417208~0.0479985)/a;②There were significant differences in the stability of vegetation coverage in different regions,with 7.26%of the areas with stable vegetation coverage,31.12%of the areas with significant improvement,and 9.39%of the areas with severe degradation.③In the evolution trend of vegetation cover,persistence and anti-persistence were staggered,and the overall pattern was weak persistence.The results of this study can provide a reference for the restoration and protection of the ecological environment in Longnan City.

关 键 词：植被覆盖度 时空演变 Theil-Sen Median趋势分析 陇南市 

分 类 号：X826[环境科学与工程—环境工程]