| 乌审旗植被覆盖度动态变化及其与降水量的关系 |
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| 引用本文： | 于小飞,孙睿,陈永俊,刘绍民,周会珍,张忠山.乌审旗植被覆盖度动态变化及其与降水量的关系[J].资源科学,2006,28(4):31-37. |
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| 作者姓名： | 于小飞 孙睿 陈永俊 刘绍民 周会珍 张忠山 |
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| 作者单位： | 1. 北京师范大学地理学与遥感科学学院,遥感科学国家重点实验室,环境遥感与数字城市北京市重点实验室,北京,100875
2. 内蒙古乌审旗林业局毛乌素沙地开发整治研究中心,乌审旗,017300 |
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| 基金项目： | 中国科学院资助项目;教育部长江学者奖励计划;高比容电子铝箔的研究开发与应用项目 |
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| 摘 要： | 利用GIMMS（Global Inventory Modelling and Mapping Studies）数据集的8km的AVHRR NDVI（均一化植被指数）数据，分别用年最大NDVI的平均值和年最大NDVI的斜率对1981年～2003年23年间的内蒙古乌审旗植被覆盖度的空间分布及其动态变化进行了分析，并通过比较降水量与年最大NDVI的年际变化以及分析降水量与年最大NDVI之间的相关系数研究了降水对乌审旗植被覆盖的影响；利用1986年，1994年的TM和2002年的ETM+数据分析了乌审旗植被的主要变化类型。结果表明，这23年间植被覆盖度和降水量的年际变化趋势基本一致，年最大NDVI与前一年8月至当年7月的降水有最好的相关性，并且在地表覆盖为草地和灌木林地的地区，二者的相关性要高于地表覆盖为耕地和乔木林地的地区；植被覆盖度最低值分布在地表主要覆盖为沙地的乌审旗西北部，植被覆盖度最高值分布在地表覆盖为耕地的东南部；人类活动的积极影响使得植被覆盖度总的趋势是在增加的，但由于气候的干旱趋势使中部一些乡镇的植被覆盖度是在减少的，其余的地区都是在增大的，且变率很大。
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| 关 键 词： | 植被覆盖度 植被指数 降水量 年际变化 |
| 文章编号： | 1007-7588(2006)04-0031-07 |
| 收稿时间： | 2005-10-09 |
| 修稿时间： | 2005-11-25 |
Dynamics of Vegetation Cover and Its Relationship with Rainfall
in Wushen County of Inner Mongolia |
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| YU Xiao-fei,SUN Rui,CHEN Yong-jun,LIU Shao-min,ZHOU Hui-zhen and ZHANG Zhong-shan.Dynamics of Vegetation Cover and Its Relationship with Rainfall
in Wushen County of Inner Mongolia[J].Resources Science,2006,28(4):31-37. |
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| Authors: | YU Xiao-fei SUN Rui CHEN Yong-jun LIU Shao-min ZHOU Hui-zhen and ZHANG Zhong-shan |
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| Institution: | 1. School of Geography, Belling Normal University, State key Laboratory of Remote Sensing Science, Bejing Key Laboratory for Remote Sensing of Environment and Digital Cities, Beijing 100875, China ; 2. Wushen County Forestry Bureau, Exploitation and Repair Study Center of the Muus Sandland, Wushen County 017300, China |
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| Abstract: | The dynamic change of 23-years vegetation cover in Wushen County of Inner Monggulia was analyzed using NASA GIMMS(Global Inventory Modeling and Mapping Studies) Normalized Difference Vegetation Index(NDVI) data set.The average value of annual max NDVI in latest five years and the slope of annual max NDVI were used to analyze the vegetation distribution in Wushen County during the last 23 years.Mean absolute deviation of maximum NDVI was also used to study the change intensity of the vegetation cover.The high-resolution images-Landsat TM data of the year 1986 and 1994 and ETM+ data of 2002 were used to find the change patterns of vegetation in Wushen County.The influence of rainfall on vegetation cover in Wushen County was explored through correlation analysis between annual rainfall and annual maximum of NDVI.The result shows that,the change of the vegetation cover in the last 23 years is consistent with the change of rainfall.The annual maximum of NDVI is significantly related to the rainfall during August to July of second year.The significance of correlation in grassland and shrub forest is higher than in cropland and arboreal forest.The lowest rate of vegetation cover is in desert area of northwestern Wushen County;the highest is in cropland in the southwest of the county.Generally human activities have been promoting the increase of vegetation cover.But in some areas the vegetation cover presents a trend of decrease due to dry weather. |
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| Keywords: | NDVI |
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