青藏高原植被生长对PDO响应的季节分异  

Seasonal divergence in the responses of vegetation growth to PDO in Tibetan Plateau,China

作　　者：石芳忠 李小雁[1,2] 吴秀臣 刘文玲[1,2] 裴婷婷 孔冬冬 蒋志云 张瑜[1,2] SHI Fang-zhong;LI Xiao-yan;WU Xiu-chen;LIU Wen-ling;PEI Ting-ting;KONG Dong-dong;JIANG Zhi-yun;ZHANG Yu(State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;School of Natural Resources, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China;Department of Water Resources and Environment, Sun Yat-sen University, Guangzhou 510275, China ）.)

机构地区：[1]北京师范大学地表过程与资源生态国家重点实验室,北京100875 [2]北京师范大学地理科学学部资源学院,北京100875 [3]中山大学水资源与环境系,广州510275

出　　处：《应用生态学报》2018年第4期1107-1116,共10页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(41571038);地表过程与资源生态国家重点实验室项目(2017-ZY-06)资助~~

摘　　要：利用卫星遥感观测的区域尺度归一化植被指数(NDVI)和格点气候数据,借助Spearman相关分析及基于多变量回归分析的结构方程模型,研究了1982—2015年青藏高原植被生长季节变化对太平洋10年际涛动(PDO)的响应格局及机理过程.结果表明:青藏高原生长季(4—10月)平均NDVI与PDO指数存在显著的负相关关系,但是PDO与不同季节NDVI之间的关系呈现出明显的季节分异,具体表现为PDO与秋季NDVI的负相关关系强于夏季,且冬季PDO显著影响次年青藏高原夏季植被生长.另外,PDO对青藏高原植被生长的调控过程在季节间存在明显分异,夏季表现为PDO对温度和降水的共同调控,而秋季则以对温度调控为主.Regional-scale normalized difference vegetation index （NDVI） derived from satellite remote sensing observations and g-ridded climate data were used to study the seasonal responses and underlying mechanisms of vegetation growth over Tibetan Plateau to Pacific Decadal Oscillation （PDO） at period of 1982-2015, by performing Spearman correlation analysis and enhanced multi- variate regression model： structural equation model （SEM）. The results showed that there was significant negative correlation between PDO index and mean growing-season （April- October） NDVI over Tibetan Plateau; however, marked seasonal divergence in the relationship between PDO and vegetation growth existed among different seasons. It characterized with stronger negative corre- lation between PDO and NDVI in autumn than in summer, and winter PDO had significant effect on consequent summer vegetation growth. Additionally, it showed great divergence in control processes of PDO on vegetation growth among different seasons, with significant control of PDO on both temperature and precipitation in summer, and significant control of PDO on temperature only in

关 键 词：PDO 青藏高原 植被生长 季节响应 结构方程模型 气候变化 

分 类 号：Q948[生物学—植物学]