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| The Relationship between Normalized Difference Vegetation Index （NDVI） and Climate Factors in the Semiarid Region： A Case Study in Yalu Tsangpo River Basin of Qinghai-Tibet Plateau | |
| 作者姓名： | GUO Bing ;ZHOU Yi ;WANG Shi-xin ;TAO He-ping |
| 作者单位： | [1]Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China; [2]University of Chinese Academy of Sciences, Beijing 100049, China; [3]Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China |
| 基金项目： | funded by the National Natural Science Foundation of China (Grant No. 41201441, No. 41371363, and No. 41301501);Guangxi Key Laboratory of Spatial Information and Geomatics (Grant No. 1207115-18);the knowledge innovation project of the Chinese academy of sciences (Grant Nos. KZCX2YW-333, KZCXZ-EW-317) |
| 摘 要： | The Yalu Tsangpo River basin is a typical semi-arid and cold region in the Qinghai-Tibet Plateau, where significant climate change has been detected in the past decades. The objective of this paper is to demonstrate how the regional vegetation, especially the typical plant types, responds to the climate changes. In this study, the model of gravity center has been firstly introduced to analyze the spatial-temporal relationship between NDVI and climate factors considering the time-lag effect. The results show that the vegetation grown has been positively influenced by the rainfall and precipitation both in moving tracks of gravity center and time-lag effect especially for the growing season during the past thirteen years. The herbs and shrubs are inclined to be influenced by the change of rainfall and temperature, which is indicated by larger positive correlation coefficients at the 0.05 confidence level and shorter lagging time. For the soil moisture, the significantly negative relationship of NDV-PDI indicates that the growth and productivity of the vegetation are closely related to the short-term soil water, with the correlation coefficients reaching the maximum value of o.81 at Lag 0-1. Among the typicalvegetation types of plateau, the shrubs of low mountain, steppe and meadow are more sensitive to the change of soil moisture with coefficients of -0.95, -0.93, -0.92, respectively. These findings reveal that the spatial and temporal heterogeneity between NDVI and climatic factors are of great ecological significance and practical value for the protection of eco-environment in Qinghai-Tibet Plateau. |
| 关 键 词： | 归一化植被指数 雅鲁藏布江流域 半干旱地区 青藏高原 气候因素 NDVI 滞后效应 滞后时间 |
The relationship between normalized difference vegetation index (NDVI) and climate factors in the semiarid region: A case study in Yalu Tsangpo River basin of Qinghai-Tibet Plateau |
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| GUO Bing,;ZHOU Yi,;WANG Shi-xin,;TAO He-ping.The relationship between normalized difference vegetation index (NDVI) and climate factors in the semiarid region: A case study in Yalu Tsangpo River basin of Qinghai-Tibet Plateau[J].Journal of Mountain Science,2014,11(4):926-940. | |
| Authors: | Bing Guo Yi Zhou Shi-xin Wang He-ping Tao |
| Institution: | 1. Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, 100101, China 2. University of Chinese Academy of Sciences, Beijing, 100049, China 3. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China |
| Abstract: | The Yalu Tsangpo River basin is a typical semi-arid and cold region in the Qinghai-Tibet Plateau, where significant climate change has been detected in the past decades. The objective of this paper is to demonstrate how the regional vegetation, especially the typical plant types, responds to the climate changes. In this study, the model of gravity center has been firstly introduced to analyze the spatial-temporal relationship between NDVI and climate factors considering the time-lag effect. The results show that the vegetation grown has been positively influenced by the rainfall and precipitation both in moving tracks of gravity center and time-lag effect especially for the growing season during the past thirteen years. The herbs and shrubs are inclined to be influenced by the change of rainfall and temperature, which is indicated by larger positive correlation coefficients at the 0.05 confidence level and shorter lagging time. For the soil moisture, the significantly negative relationship of NDV-PDI indicates that the growth and productivity of the vegetation are closely related to the short-term soil water, with the correlation coefficients reaching the maximum value of 0.81 at Lag 0-1. Among the typical vegetation types of plateau, the shrubs of low mountain, steppe and meadow are more sensitive to the change of soil moisture with coefficients of-0.95,-0.93,-0.92, respectively. These findings reveal that the spatial and temporal heterogeneity between NDVI and climatic factors are of great ecological significance and practical value for the protection of eco-environment in Qinghai-Tibet Plateau. |
| Keywords: | Climate change Gravity center Correlation coefficients Vegetation productivity Time-lag effect |
| 本文献已被 CNKI 维普 SpringerLink 等数据库收录！ | |