2000—2020年青藏公路沿线植被覆盖时空变化  

Spatio-Temporal Variation of Vegetation Coverage along the Qinghai-Tibet Highway from 2000 to 2020

作　　者：王祖辉 孙侃 傅楷翔 贾国栋[3] 余新晓[3] Wang Zuhui;Sun Kan;Fu Kaixiang;Jia Guodong;Yu Xinxiao(CCCC HEMEI Eco-Environmental Construction Co.,Ltd.,Wuhan 430000,P.R.China;Beijing Forestry University;Key Laboratory of National Forestry and Grassland Administration on Soil and Water Conservation(Beijing Forestry University))

机构地区：[1]中交和美环境生态建设有限公司,武汉430000 [2]北京林业大学 [3]水土保持国家林业和草原局重点实验室(北京林业大学)

出　　处：《东北林业大学学报》2025年第5期90-96,152,共8页Journal of Northeast Forestry University

基　　金：中交二公院基金项目(KJFZ-2020-002)。

摘　　要：植被覆盖是衡量地表植被状况和生态系统稳定性的重要指标,应用谷歌地球引擎(GEE)平台获取Landsat-5/8系列遥感影像,构建2000—2020年青藏公路沿线植被覆盖度序列数据。采用曼-肯德尔(Mann-Kendall)趋势检验、森氏(Sen’s)斜率估计、Hurst指数、变异系数分析法,探讨青藏公路沿线近20 a植被覆盖时空变化特征及演变趋势。结果表明:①在时间尺度上,研究区植被覆盖度波动上升,多年均值为0.1452,2015年达到0.1811;在空间尺度上,其呈现“两端高,中间低”的态势。②青藏公路沿线较低植被覆盖等级的面积比例保持在36%以上,较高覆盖和高覆盖的面积占比变化明显,与2000年相比,两者分别上升了5.03%、12.76%。③该研究区研究时段植被变化趋势以改善趋势为主,短期内变化趋势不会发生较大逆转,未来变化趋势仍将以改善为主。Vegetation coverage is an important indicator for measuring the status of surface vegetation and the stability of the ecosystem.The Google Earth Engine(GEE)platform was applied to obtain Landsat-5/8 series remote sensing images,and a sequence of vegetation coverage data along the Qinghai-Tibet Highway from 2000 to 2020 was constructed.Methods such as the Mann-Kendall trend test,Sen’s slope estimation,Hurst index,and coefficient of variation analysis were used to explore the spatio-temporal variation characteristics and evolution trends of vegetation coverage along the Qinghai-Tibet Highway in the past 20 years.The results showed that:(1)On the temporal scale,the vegetation coverage in the study area fluctuated and increased,with a multi-year average value of 0.1452,reaching 0.1811 in 2015.On the spatial scale,it presented a situation of“high at both ends and low in the middle”.(2)The proportion of the area with a relatively low vegetation coverage grade along the Qinghai-Tibet Highway remained above 36%,and the proportions of the areas with relatively high and high coverage changed significantly.Compared with 2000,they increased by 5.03%and 12.76%respectively.(3)The vegetation change trend in the study area during the study period was mainly an improvement trend.The change trend would not reverse greatly in the short term,and the future change trend would still be mainly an improvement.

关 键 词：青藏公路 公路路域 植被覆盖 时空变化 演变趋势 

分 类 号：S715.3[农业科学—林学]