干旱区生态环境知识资源中心(Arid): 汉江中游河谷平原植被指数时空变化及其与沙化土地动态的关联关系

Arid

	汉江中游河谷平原植被指数时空变化及其与沙化土地动态的关联关系
其他题名	RELATIONSHIP BETWEEN TEMPORAL AND SPATIAL CHANGE OF VEGETATION INDEX AND DESERTIFICATION LAND DYNAMIC IN THE PLAIN AREA OF MIDDLE REACHES OF THE HANJIANG RIVER
	陈慧; 杜耘; 肖飞; 王学雷; 严翼; 李元征
来源期刊	长江流域资源与环境
ISSN	1004-8227
出版年	2013
卷号	22 期号:9 页码:1221-1226
中文摘要	针对沙化土地广泛分布的汉江中游河谷平原区,采用MODIS EVI数据分析2003~2011年区域植被状态时空变化,并据此探讨沙化土地的动态特征。利用时序植被指数统计分析,探讨研究区植被的总体变化规律;分析不同缓冲区植被指数的空间分布格局,反映了区域环境状况的空间差异以及由此而可能产生的土地利用格局的变化;并基于不同距离缓冲区的EVI时空差异对比分析,探讨沙化土地动态与植被变化的关联关系。研究表明,近9 a来汉江中游河谷平原区EVI呈明显上升趋势;随着离河流距离的逐渐增加,每千米范围内各年的年均EVI值均表现出先增大后减小的空间特征,并在距河3 km区域处EVI值达到最大;而EVI的时空差异,则体现了沙化土地的空间分布与动态特征.
英文摘要	Remote sensing has the advantage of high temporal resolution and monitoring large scale environment,thus it has been widely used to monitor the dynamic status of desertification.The vegetation index extracted from remotely sensed image can be used for regional desertification assessment.The normalized difference vegetation index (NDVI),as a common vegetation index,has been widely used to quantitatively and qualitatively assess the desertification during the past 20 years.However,the soil background and atmospheric noise influenced the application of NDVI.The enhanced vegetation index (EVI) is developed to avoid the interference from soil backgrounds and atmosphere,thus may show efficiency in monitoring the desertification dynamism.The plain area in the middle reaches of the Hanjiang River,especially for the valley,is characterized by high coverage.Monitoring the desertification status with regular remote sensing data is difficult,although the desertification of this region is ubiquitous.In this study,the vegetation coverage changes of this region during 20032011 were investigated with the time series of MODIS EVI data.The dynamics of desertification decreased during this period,as the EVI increased gradually.The South-to-North Water Diversion Project triggered the decline of groundwater level for middle reaches of the Hanjiang River,and this might facilitate the desertification.Furthermore,the impairment of the decline in groundwater on EVI was negatively correlated to the distance from river.In response,a large area of land afforesting has been initiated to prevent the land from deserting in Lao Hekou,Xiangfan and Zhongxiang since 1990.However,the improvement of this project on vegetable coverage has not been accessed yet.According to the distance from the river,the region investigated was assigned as 8 buffer zones with equal distance of 1 km and the associated characteristics were analyzed.There were pronounced spatial fluctuations for EVI in buffer regions of different distances.In 13 km buffer region,the mean value of annual EVI increased with the distance from the river,and reached the maximum value at 3 km.Whereas in 38 km buffer zone,the EVI value decreased gradually.Additionally,these changes could not be well explained by synchronized climate factors,such as mean monthly temperature or/and precipitations.However,the variations of EVI in temporal and spatial scale may be attributed to the innate physiological,chemical and biological differences in soil.In conclusion,EVI values of the plain area in the middle reaches of the Hanjiang River valley showed a conspicuous ascendant trend during the last nine years,suggesting the efficiency of afforestation against desertification.While the discrepancy of EVI in different spatial scales suggested that attentions should be paid to the innate features of soil and proceed from local reality conditions.
中文关键词	汉江中游 ; 缓冲区 ; 沙化
英文关键词	MODIS EVI middle reaches of the Hanjiang River buffer region MODIS EVI desertification
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY ; GEOGRAPHY
WOS研究方向	Geology ; Geography
CSCD记录号	CSCD:4951375
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230436
作者单位	中国科学院测量与地球物理研究所, 湖北省环境与灾害监测评估重点实验室, 武汉, 湖北 430077, 中国
推荐引用方式 GB/T 7714	陈慧,杜耘,肖飞,等. 汉江中游河谷平原植被指数时空变化及其与沙化土地动态的关联关系[J],2013,22(9):1221-1226.
APA	陈慧,杜耘,肖飞,王学雷,严翼,&李元征.(2013).汉江中游河谷平原植被指数时空变化及其与沙化土地动态的关联关系.长江流域资源与环境,22(9),1221-1226.
MLA	陈慧,et al."汉江中游河谷平原植被指数时空变化及其与沙化土地动态的关联关系".长江流域资源与环境 22.9(2013):1221-1226.