羌塘国家自然保护区植被生长季NDVI时空变化及其对气候变化的响应  

Spatial-temporal Variation of NDVI in the Vegetation Growing Season of Changtang National Nature Reserve and Its Response to Climate Change

作　　者：袁雷[1] 周刊社[1] 张东东 YUAN Lei;ZHOU Kanshe;ZHANG Dongdong(Tibet Climate Centre,Lhasa 850000)

机构地区：[1]西藏自治区气候中心,拉萨850000

出　　处：《中国农学通报》2022年第13期127-134,共8页Chinese Agricultural Science Bulletin

基　　金：西藏自治区科技重点研发计划“气候变化背景下西藏高原季节划分及农业气候资源时空变化特征研究”(XZ202001ZY0023N);第二次青藏高原综合科学考察研究项目“西风-季风协同作用及其环境效应”(2019QZKK0106);国家自然科学基金“羌塘国家级自然保护区气候变化及其对生态环境的影响”(41765011)。

摘　　要：为详细了解羌塘国家级自然保护区生长季NDVI时空特征及其对气候变化的响应,使用MODIS传感器的生长季归一化植被指数(NDVI),计算2000—2020年羌塘国家级自然保护区各功能区生长季NDVI变化趋势和稳定性,结合中国第一代大气和陆面再分析产品(CRA/LAND)研究NDVI对气候变化的响应。结果表明:(1)保护区多年植被生长季NDVI均值为0.02~0.55,平均值为0.138,呈现由东南向西北逐渐减小的空间分布特征。(2)保护区86.39%的面积区域植被生长季(6—9月)NDVI呈缓慢上升趋势,并且大部分区域达到显著水平(P<0.05),剩余13.61%的面积区域植被生长季NDVI处于下降趋势,其中只有极少部分区域达到显著性水平(P<0.05);总体植被状况随时间变化呈变好趋势。(3)2000年以来保护区的生长季NDVI稳定性较差,NDVI≤0.1的大部分区域处于较低稳定度,较低稳定度和中等稳定度面积之和占整个研究区域面积的86.66%。(4)保护区在植被生长季气候趋向于“暖湿化”;气温与降水量对保护区生长季NDVI都有重要的正向影响。研究结论能为气候变化背景下该区域植被生态保护提供一定科学依据。To clarify the spatial-temporal variation characteristics of vegetation covers in the Changtang National Nature Reserve during the growing season and their responses to climate change, based on the MODIS NDVI and the meteorological data of the same period, the variation trend and stability of NDVI and their response to climate factors during vegetation growing season from 2000 to 2020 in the Changtang National Nature Reserve were caculated. The results showed that:(1) the average NDVI in the growing season of vegetation in the Changtang National Nature Reserve was 0.02-0.55, and the average value was 0.138, which showed a spatial distribution characteristic that gradually decreased from southeast to northwest;(2) in 86.39%of the Changtang National Nature Reserve, the NDVI in the vegetation growing season(June to September)showed a slow upward trend, and reached a significant level in most areas(P<0.05), while the remaining13.61% of the area showed a declining trend, and there was a significant trend in only a few areas(P<0.05);the overall vegetation status showed an improving trend with time;(3) since 2000, the stability of NDVI in the growing season of the Changtang National Nature Reserve was relatively poor, most of the areas with NDVI≤0.1were in low stability, the low and medium stability areas were the main type, which accounted for 86.66% of the Changtang National Nature Reserve;(4) the climate in the Changtang National Nature Reserve was getting warmer and wetter during the vegetation growing season;NDVI was positively correlated with temperature and precipitation as a whole during the growing season. The research conclusions could provide a scientific basis for the ecological protection of vegetation in this region under the background of climate change.

关 键 词：羌塘国家自然保护区 NDVI 时空特征 气温 降水 

分 类 号：P964[天文地球—自然地理学] Q948[生物学—植物学]