基于GoogleEarthEngine的黄土高原植被覆盖度时空变化特征分析  

Analysis on the Characteristics of the Spatiotemporal Change in Vegetation Coverage on the Loess Plateau Using the Google Earth Engine

作　　者：姚楠 董国涛[2,3] 薛华柱 Yao Nan;Dong Guotao;Xue Huazhu(School of Surveying and Land Information Engineering,Henan Polytechnic University,Henan,Jiaozuo 454000,China;Yellow River Conservancy Commission,Yellow River Institute of Hydraulic Research,Zhengzhou 450003,China;Heihe Water Resources and Ecological Protection Research Center,Lanzhou 730030,China)

机构地区：[1]河南理工大学测绘与国土信息工程学院,河南焦作454000 [2]黄河水利委员会黄河水利科学研究院,郑州450003 [3]黑河水资源与生态保护研究中心,兰州730030

出　　处：《水土保持研究》2024年第1期260-268,共9页Research of Soil and Water Conservation

基　　金：国家自然科学基金项目(51779099,51779209,51909099);国家重点研发计划项目(2016YFC0402400)。

摘　　要：[目的]探究黄土高原植被覆盖度变化的时空特征,揭示植被对气候因子变化的时滞效应,进而为地区生态保护与高质量发展提供数据支撑。[方法]基于2001年至2020年的黄土高原地区NDVI数据、气温和降水数据,利用像元二分法、一元线性回归和时滞偏相关分析等方法,开展地区植被与气候因子变化关系的研究。[结果]过去20年间,黄土高原植被覆盖度以0.076/10 a的速率增加,在空间上主要呈现极显著增加,但占总面积38.29%的区域植被覆盖变化波动较大。黄土高原月植被覆盖度与气温和降水呈现显著正相关关系,其中降水是影响植被变化的主要因素。植被对降水的响应滞后时间主要集中在3个月,而气温的滞后时间在空间上存在较大差异,东南部植被主要滞后0至1个月,而西北部植被主要滞后2至3个月。[结论]黄土高原植被变化主要受降水影响,20年间植被恢复情况良好,但变化波动较大,未来应继续生态保护工作进行巩固。[Objective]This study aims to explore the vegetation cover change and its response of climate factors for coping with global climate change and promoting the ecological protection and high-quality development of the Loess Plateau.[Methods]Based on NDVI,temperature and precipitation data of the Loess Plateau from^(2)001 to 2020,pixel dichotomy,linear regression and time lag partial correlation analysis models were used to characterize the vegetation cover change on the Loess Plateau and its response mechanism to climate factors.[Results]The annual vegetation coverage in the Loess Plateau had increased at a rate of 0.076/decade in past two decades with a predominantly significant spatial distribution of pronounced growth.The areas of vegetation cover that fluctuated greatly accounted for 38.29%of the whole area.The relationship between monthly vegetation cover,temperature and precipitation on the Loess Plateau was significantly positive correlation,and precipitation was the main factor affecting vegetation change.The lag time of vegetation response to precipitation was mainly 3 months,and the lag time of vegetation response to temperature existed spatial differences between southeast(0~1 month)and northwest(2~3 months).[Conclusion]The vegetation changes in the Loess Plateau were primarily influenced by precipitation.Over the course of 20 years,there had been a favorable recovery of vegetation.However,there were significant fluctuations in this change.Future efforts should continue to focus on ecological conservation work in order to ensure the consolidation of these improvements.

关 键 词：植被覆盖度 GEE 时滞相关 气候变化 黄土高原 

分 类 号：Q948[生物学—植物学]