长江流域资源与环境 >> 2014, Vol. 23 >> Issue (01): 101-.doi: 10.11870/cjlyzyyhj201401015

• 生态环境 • 上一篇    下一篇

近十年重庆市NDVI变化及对气温降水的旬响应特征分析

李学梅|任志远   

  1. (1.陕西师范大学旅游与环境学院|陕西 西安 710062|2.重庆师范大学地理与旅游学院|重庆 400047)
  • 出版日期:2014-01-20

CHANGE OF NDVI AND ITS TENDAY RESPONSE TO TEMPERATURE AND PRECIPITATION IN CHONGQING OVER THE LAST DECADE

LI Xuemei1,2,REN Zhiyuan1   

  1. (1.College of Tourism and Environment,Shaanxi Normal University,Xian 710062,China;2.College of Tourism &|Geography,Chongqing Normal University,Chongqing |400047,China)
     
  • Online:2014-01-20

摘要:

在利用SPOT VGTNDVI旬数据、重庆市及周边20个气象站点1999~2010年日气温与降水数据以及研究区相关图件资料的基础上,运用均值法、差值法、趋势线分析和时滞互相关分析法分析重庆市NDVI变化的时空特征及旬平均NDVI与旬均温和旬降水的相关性以及时滞情况。结果表明:1999~2010年重庆市NDVI呈稳步上升趋势;NDVI下降的区域主要集中在渝西北、渝东北、渝南等三峡库区的外围;NDVI与气温和降水之间存在较强的相关性,且NDVI与气温较与降水之间的相关性更强,表明在研究区气温对NDVI的影响大于降水;NDVI与气温和降水之间的相关性和时滞情况存在明显的东南—西北差异,东南地区时滞较长、相关性低,西北地区时滞较短,相关性高;各植被类型NDVI与气温和降水的相关程度高低以及响应速度的快慢决定于各植被类型的生长发育规律及其对气温或降水要求的高低

Abstract:

The characters of vegetation cover change and the interaction between vegetation and atmosphere are important in geosciences and have become research focus in recent years.As a sensitive indicator of vegetation cover and vegetation growth status,the Normalized Difference Vegetation Index (NDVI) has been widely used in environmental,ecological,and agricultural studies.Climate change and human activities are both responsible for the improvement and degradation of vegetation cover to a certain degree.Especially,since the “Grain for Green Projects” was initiated by the government in 1999,it played an important role in vegetation restoration in the ecosystem vulnerable zone of Western China.Accounting for 85% of the Three Gorges Reservoir area,Chongqing municipality is an important ecological,hydrological and wildlife conservation area in Southwestern China.Examining vegetation dynamics and environmental changes in this region plays a critical role in studying the environment and ecosystems in China.We studied vegetation change and its relationship with major climatic factors in Chongqing using RS,GIS and time lag correlation methods,SPOT4 VEGETATION NDVI datasets at 1 km spatial resolution and tenday temperature and precipitation datasets between 1999 and 2010.The results are summarized as follows.Spatially averaged annual NDVI in Chongqing showed a pronounced increase during the last decade.Especially,NDVI in the Three Gorges Reservoir area increased prominently which was caused by the NDVI increase of farmland and forestland.In the Three Gorges Reservoir area,the area of NDVI decrease was concentrated around city and bank of the Yangtze River.Obviously,the reason is the increase of city and water area.By contrast,decreased NDVI outside the Three Gorges Reservoir area was mostly located in the Northwestern,Southern and Northeastern part of Chongqing.In the Northwestern part,the decrease of NDVI was caused by the vegetable base and the building of plastic bigarch Shelter.In the Northeastern and Southern part,the decrease of NDVI was caused by the construction of economic forests.Across the entire study region,both air temperature and precipitation had an influence on NDVI,but air temperature played a more prominent role.So temperature was a constraint factor for vegetation growth in Chongqing.Across the research area there were significant regional and temporal differences in the response.From southeast to northwest there were greater correlation and faster response.Different vegetation types responded to water/thermal condition differently,which was dependent on growing season and water/thermal conditions.If one certain type of vegetations growth requires a higher temperature,it will show a faster response to temperature.In contrast,if the vegetations growth do not depend so much on higher temperature,it will show a slower response to temperature.This pattern can also be applied to the response to precipitation

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