贵州省黔东南州近20年NDVI时空变化特征分析
Spatial and Temporal Variation of NDVI in Qiandongnan Prefecture,Guizhou Province in Recent 20 Years
梁任刚 1刘松 1任金铜 2刘晓凤1
作者信息
- 1. 黔东南州自然保护地发展中心,贵州 凯里 556000
- 2. 贵州工程应用技术学院生态工程学院,贵州 毕节 551700
- 折叠
摘要
探究贵州省黔东南州植被覆盖变化特征,以期为黔东南州生态环境保护和林业高质量发展提供科学参考依据.基于中分辨率遥感产品MODIS数据,采用Theil-Sen Median趋势分析、Mann-Kendall检验、变异系数等方法,对黔东南州近20年来的植被覆盖时空变化特征进行研究.结果表明:黔东南州NDVI年均值整体呈增加趋势(R2=0.4285),年内变化为夏季高,冬季低;空间上呈东南高、西北低的分布特征,多年均值为0.69;空间变化较为平稳,CV均值为0.06o黔东南州近20年来生态修复工作成效显著,建议在继续巩固退耕还林还草工作成效的同时,加大西北部石漠化治理力度,促进当地植被覆盖持续恢复.
Abstract
To explore the change characteristics of vegetation cover in Qiandongnan prefecture,Guizhou province,in order to provide scientific reference for ecological environmental protection and high-quality forestry development in Qiandongnan prefecture.Based on MODSI data of medium resolution remote sensing products,Theil-Sen Median trend analysis,Mann-Kendall test,coefficient of variation and other methods were adopted.The temporal and spatial changes of vegetation cover in southeast Guizhou province in recent 20 years were studied.The results showed as follows:The annual mean variation of NDVI in southeast Guizhou was stable(R2=0.4285),and showed an overall increasing trend,with an average growth rate of 0.0026/a.The annual variation of NDVI showed obvious seasonality,high in summer and low in winter;The mean NDVI of Qiandongnan prefecture in recent 20 years was 0.69,the overall vegetation coverage was higher,and the spatial distribution was higher in southeast and lower in northwest.The distribution was highest in Jianhe county and lowest in Kaili city.The spatial variation of NDVI in Qiandongnan prefecture was relatively stable during the study period,and the average CV was 0.06.Conclusion:The results of returning farmland to forest and grassland in Qiandongnan prefecture in recent 20 years are remarkable.It is suggested that the government should make reasonable planning of project construction land while continuing to consolidate the work of returning farmland to forest and grassland,and avoid occupying no or less forestry land.
关键词
黔东南州/NDVI/空间变化特征Key words
Qiandongnan Prefecture/NDVI/Spatial Variation Characteristics引用本文复制引用
基金项目
贵州省林业局2022年度林业优秀青年人才培养专项资金项目(黔林科合J字[2022]133号)
中共毕节市委人才工作领导小组办公室"喀斯特高原资源与环境遥感人才团队"(毕委人领通[2023]14号)
毕节市科学技术局2023年第二批联合基金项目(毕科联合[2023]8号)
出版年
2024
NETL
NSTL
万方数据