| 2000—2015年青藏高原草地归一化植被指数对降水变化的响应 |
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| 引用本文： | 王志鹏,张宪洲,何永涛,李猛,石培礼,俎佳星,牛犇.2000—2015年青藏高原草地归一化植被指数对降水变化的响应[J].生态学杂志,2018,29(1):75-83. |
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| 作者姓名： | 王志鹏 张宪洲 何永涛 李猛 石培礼 俎佳星 牛犇 |
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| 作者单位： | 1.中国科学院地理科学与资源研究所, 生态网络观测与模拟重点实验室拉萨高原生态试验站, 北京 100101;;2.中国科学院大学, 北京 100049;;3.中国科学院大学资源与环境学院, 北京 100190 |
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| 基金项目： | 本文由西藏自治区重大科技专项(Z2016C01G01/02)、国家重点研发计划项目(2016YFC0502001)和中国科学院特色研究所培育建设项目(TSYJS05)资助 |
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| 摘 要： | 降水变化是造成青藏高原草地植被生长年际变异的重要因素,降水量、分配方式及发生时间是降水变化的重要特征.利用2000—2015年青藏高原及附近区域145个气象站点的降水资料,以年降水量表征降水整体状况,以改进的降水集度(PCI)表征年内降水的分配状况,以定义的降水重心(PC)表征降水的集中时期,分析青藏高原降水变化的时空特征;并进一步以归一化植被指数最大值(NDVImax)表征植被生长状况,探讨了青藏高原草地对降水年际变化的响应.结果表明: 青藏高原年降水量和PCI存在明显的梯度特征,PC在西藏南部形成中心.青藏高原灌丛草地NDVImax年际变化对PCI变化响应敏感,降水越均匀越有利于NDVImax的增加,但受到降水量的限制;高寒草甸对降水特征没有表现出显著的相关关系;草原植被NDVImax的年际变化同时受PCI和PC的控制;高寒荒漠植被NDVImax的年际变化主要受降水量的控制.在研究降水变化对青藏高原不同类型植被的影响时,除降水量之外,还需进一步考虑降水的分配格局等特征.
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| 关 键 词： | 青藏高原 降水变化 降水集度 降水集中期 NDVI最大值 |
| 收稿时间： | 2017-06-15 |
Responses of normalized difference vegetation index (NDVI) to precipitation changes on the grassland of Tibetan Plateau from 2000 to 2015. |
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| WANG Zhi-peng,ZHANG Xian-zhou,HE Yong-tao,LI Meng,SHI Pei-li,ZU Jia-xing,NIU Ben.Responses of normalized difference vegetation index (NDVI) to precipitation changes on the grassland of Tibetan Plateau from 2000 to 2015.[J].Chinese Journal of Ecology,2018,29(1):75-83. |
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| Authors: | WANG Zhi-peng ZHANG Xian-zhou HE Yong-tao LI Meng SHI Pei-li ZU Jia-xing NIU Ben |
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| Institution: | ;1.Lhasa Plateau Ecological Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;;2.University of Chinese Academy of Sciences, Beijing 100049, China;;3.Colllege of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | Precipitation change is an important factor in the inter-annual variation of grassland growth on the Tibetan Plateau. The total amount, distribution pattern and concentration time are three basic characteristics of precipitation change. The temporal and spatial characteristics of precipitation change were analyzed based on climate data of 145 meteorological stations on the Tibetan Plateau and nearby areas from 2000 to 2015. The total precipitation amount was characterized by annual precipitation, distribution pattern of precipitation during the year was characterized by improved precipitation concentration index (PCI), and precipitation centroid (PC) was defined to indicate the change in precipitation concentrated time. To better illustrate the response of grassland to precipitation change, vegetation growth status was characterized by the maximum value of normalized difference vegetation index (NDVImax). Results indicated that the annual precipitation and PCI had an apparent gradient across the whole plateau and the latest PC occurred in the southern plateau. NDVImax of alpine shrub grassland was significantly correlated with the change of PCI,increased with even distribution of precipitation during growth period, and limited by the total annual precipitation. Alpine meadow did not show significantly correlations with these three indices. The inter-annual variability of NDVImax of steppe was controlled by both PCI and PC. NDVImax of alpine desert grassland was mainly controlled by annual precipitation. In addition to annual total amount of precipitation, the distribution characteristics of precipitation should be further considered when the influence of precipitation change on different types of vegetation on the Qinghai Tibet Plateau was studied. |
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| Keywords: | Tibetan Plateau precipitation change precipitation concentration index precipitation centroid NDVI maximum |
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