文山州植被覆盖度的时空变化及气候因子对其的影响  

Spatio-Temporal Variation of Vegetation Coverage in Wenshan Prefecture and the Influence of Climatic Factors on It

作　　者：唐露芳 黄义忠[1] Tang Lufang;Huang Yizhong(Kunming University of Science and Technology,Kunming 650093,P.R.China)

机构地区：[1]昆明理工大学,昆明650093

出　　处：《东北林业大学学报》2025年第6期61-68,共8页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(41761081);云南省社科重点基金项目(ZD202218)。

摘　　要：依据MODIS-NDVI(归一化植被指数)数据,采用趋势估计、变异系数稳定性分析、相关性分析等方法对文山州2001-2020年植被覆盖的时空变化特征及气候因子对其的影响进行研究。结果表明:2001-2020年,文山州地区年均归一化植被指数为60%~75%,整体以每年0.58%的速率上升,其中,低、中低覆盖度的植被覆盖面积减少,极高覆盖度的植被覆盖面积增加。季节归一化植被指数在6-8月份最高,12月份-翌年2月份最低。依据趋势预测及稳定性分析发现,植被覆盖呈改善趋势的区域占比为95.54%,其中,90.72%的区域处于稳定状态。3-5月份、9-12月份呈改善趋势,6-8月份呈退化趋势,此时,退化区域面积占全州面积的44.02%。春、冬季约20.00%区域的归一化植被指数稳定性为强变异状态。研究区年均气温及降雨量分布不均。归一化植被指数与降雨的相关系数为-0.75~0.72,与气温的相关系数为-0.75~0.84。其中,归一化植被指数与降雨呈正相关关系,正相关区域面积占总面积的72.43%;与气温呈负相关关系,负相关区域面积占总面积的65.68%。Based on the MODIS-NDVI(Normalized Difference Vegetation Index)data,methods such as trend estimation,coefficient of variation stability analysis,and correlation analysis were used to study the spatio-temporal variation characteristics of vegetation coverage in Wenshan Prefecture from 2001 to 2020 and the influence of climatic factors on it.The results showed that from 2001 to 2020,the annual average normalized vegetation index in Wenshan Prefecture was between 60%and 75%,and it increased at an overall rate of 0.58%per year.Among them,the areas covered by vegetation with low and relatively low coverage decreased,while the area covered by vegetation with extremely high coverage increased.The seasonal normalized vegetation index was the highest from June to August and the lowest from December to February.According to the trend prediction and stability analysis,the area of regions where the vegetation coverage showed an improvement trend accounted for 95.54%,and 90.72%of these regions were in a stable state.From March to May and from September to December,there was an improvement trend,while from June to August,there was a degradation trend.At this time,the area of the degraded regions accounted for 44.02%of the total area of the prefecture.In spring and winter,the stability of the normalized vegetation index in about 20.00%of the regions was in a strong variation state.The annual average temperature and rainfall in the study area were unevenly distributed.The correlation coefficient between the normalized vegetation index and rainfall was between-0.75 and 0.72,and the correlation coefficient between the normalized vegetation index and temperature was between-0.75 and 0.84.Among them,the normalized vegetation index had a positive correlation with rainfall,and the area of regions with a positive correlation accounted for 72.43%of the total area.It had a negative correlation with temperature,and the area of regions with a negative correlation accounted for 65.68%of the total area.

关 键 词：归一化植被指数 时空变化特征 趋势分析 相关分析 气候因子 

分 类 号：P237[天文地球—摄影测量与遥感]