长江流域资源与环境 >> 2012, Vol. 21 >> Issue (10): 1191-.

• 自然资源 • 上一篇    下一篇

金沙江流域植被覆盖时空变化特征

王 鸽 |韩 琳 |唐信英|金之川   

  1. (1.中国气象局成都高原气象研究所|四川 成都 610072;2.成都信息工程学院|四川 成都 610225;3.四川省大气探测技术中心|四川 成都 610072
  • 出版日期:2012-10-20

TEMPORAL AND SPATIAL VARIATION OF VEGETATION IN THE JINSHA RIVER BASIN

WANG Ge1, HAN Lin2| TANG Xinying1, JIN Zhichuan3   

  1. (1.Institute of Plateau Meteorology,China Meteorological Administration,Chengdu 610072,China; 2.Chengdu University of Information Technology,Chengdu 610225,China; 3.Sichuan(Provincial)Atmosphere Observation Technology Centre,Chengdu 610072,China
  • Online:2012-10-20

摘要:

金沙江流域是长江上游生态脆弱地区,是长江上游水土保持重点防治工程、天然林保护工程和退耕还林工程等生态建设工程的重点实施区。首次利用遥感数据的归一化差值植被指数,采取线性相关分析方法,借助地理信息系统软件,定量化的分析金沙江流域生态建设工程对流域植被的影响。研究结果表明:1999~2008年,金沙江流域年均NDVI在波动中呈显著增加趋势,变化趋势的空间分布存在明显的区域差异,增加速率最快的是农田植被,增加趋势最显著的是灌丛植被;季节平均的NDVI空间分布与年内变化具有明显的空间分异性,不同季节NDVI的变化趋势也存在空间分异性,春、夏、秋和冬季金沙江流域NDVI呈增加趋势的像元分别占总像元的1650%、830%、1170%和1403%;春、夏和秋季都是灌丛NDVI的增加占主导地位,冬季则是草地NDVI的增加占主导地位。基于分析,在“长治”工程、天然林保护工程和退耕还林工程等生态建设工程的综合治理和气候变化的双重影响下,金沙江流域环境向有利的方向发展

Abstract:

The Jinsha River Basin is the ecologyfragile region in the upper reaches of the Yangtze River.It is also the major areas of ecological construction projects such as the major control engineering of soil and water conservation in upper and middle Yangtze River,the protection project of natural forests and the returning cultivated land to forestry project.The effects of ecological construction projects on vegetation in the Jinsha River Basin is calculated by using the linear correlation analysis method with the support of GIS software based on the SPOT VEGETATION NDVI (Normalized Difference Vegetation Index) from 1999 to 2008.The results show that from 1999 to 2008,the dimensional distribution of annual mean NDVI was observably different.There was a significant increase trend in the annual mean NDVI.The NDVI of farmland vegetation increased fastest,and the NDVI of shrub vegetation increased most significantly.The dimensional distribution of seasonal means NDVI and seasonal variation was observably different,the pixels whose NDVI significantly increased occupied 165%,83%,117% and 1403%,respectively,in spring, summer,autumn and winter.In spring,summer and autumn,the increase trend in the annual mean NDVI were dominant by the increase of shrub vegetation NDVI,but it was dominant by the increase of grass NDVI in winter.Based on these analyses,the results indicate that the ecological construction projects and climate change makes vegetation and environment better in the Jinsha River Basin

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