摘要
基于2001-2019年MODIS数据与1985-2019年祁连山自然保护区内部及毗邻区41个气象站点逐日数据判断保护区归一化植被指数(NDVI)与气温、降水的变化,应用Pearson相关分析法探讨不同时间尺度植被对气候变化的响应.结果表明, 35 a来祁连山自然保护区年、季平均气温及降水量均不同程度上升,保护区呈暖湿化发展;19 a来保护区年、季尺度的NDVI皆呈升高趋势,植被改善区占保护区面积的61.9%,主要分布于保护区北部.年、季尺度NDVI与气温均呈正相关关系,与降水量之间有正相关与负相关的区域差异,说明NDVI对气温变化更敏感,气温是保护区植被变化的主导因素. NDVI对气候要素的响应的区域差异表现为:年尺度上,保护区85.5%与68.8%的区域NDVI分别与气温及降水量呈正相关,其中59.8%的区域重合,说明该区域的NDVI发展受气温和降水共同驱动;季尺度上,保护区春、夏、秋季分别有80.6%、77.3%、83.8%区域的NDVI与同季气温呈正相关,分别有71%、72.7%和59.2%区域的NDVI与同季降水量呈正相关,其中重合区域占保护区比例分别为57.8%、56.4%和58.8%,说明保护区有50%的区域植被发展受气温和降水的共同影响.
Based on the MODIS data from 2001 to 2019 and the daily meteorological data from 41 stations in the Qilian Mountain Nature Reserve and adjacent areas from 1985 to 2019, the changes in normalized difference vegetation index(NDVI), air temperature and precipitation thereof were judged, and the Pearson correlation analysis was applied to investigate the responses of vegetation to climate changes at different time scales. The results showed that the annual and seasonal average temperature and precipitation in the nature reserve had increased by varying degrees in the past 35 years, and the reserve had tended towards warming and humidification;in the past 19 years, the vegetation NDVI had increased in both annual and seasonal scales, and the pixel-scale vegetation improvement area accounted for 61.9% of the reserve, which was mainly distributed in the north of the reserve. NDVI at the annual and seasonal scales was positively correlated with air temperature, while there were positive and negative correlations between NDVI and precipitation, indicating that NDVI was more sensitive to air temperature, and air temperature was the dominant factor of vegetation change in the reserve. The regional differences in the response of NDVI to climate elements were as follows: on the annual scale, the NDVI of 85.5% and68.8% of the nature reserve was positively correlated with air temperature and precipitation, respectively,and 59.8% of them coincided, indicating that the development of NDVI in this part of the region was driven by air temperature and precipitation. On the seasonal scale, 80.6%, 77.3% and 83.8% of the NDVI in spring, summer and autumn were positively correlated with the air temperature in the same season,and 71%, 72.7% and 59.2% of the NDVI were positively correlated with the precipitation in the same season, respectively, and the proportion of coincident areas in the nature reserve was 57.8%, 56.4% and58.8%, respectively, thus showing that the vegetation development in half of the nature reserve was affected by air temperature and precipitation.
作者
高翔
黄星星
刘宽梅
米小婷
温蕊阳
GAO Xiang;HUANG Xing-xing;LIU Kuan-mei;MI Xiao-ting;WEN Rui-yang(College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China)
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第1期79-88,共10页
Journal of Lanzhou University(Natural Sciences)
基金
国家重点研发计划项目(2019YFC0507400)。
关键词
祁连山自然保护区
气候变化
归一化植被指数
植被响应
相关性性分析
Qilian Mountain Nature Reserve
climate change
normalized difference vegetation index
vegetation response
correlation analysis
