摘要
分析汉江上游近年来土地利用类型变化,可以揭示其生态环境的变化,为南水北调水源区各县的土地利用制定政策和生态环境保护提供参考依据。基于MODIS的MCD12Q1数据2001、2005、2009、2013年共4期遥感影像,从土地利用变化速率、类型转移、利用程度3个方面对汉江上游整个区域和各县区土地利用进行时空分析。结果表明,在汉江上游92271.44km^2的范围内,2001-2013年,林地面积增加了13075.4km^2,水域增加了183.66km^2,草地减少了7105.69km^2,耕地减少了6150.45km^2,城市建设用地变化不显著。在这3个时期,面积增加最多的是林地。草地、耕地和水域主要转化为林地,另外草地和耕地之间还相互转移,城市建设用地主要转移为耕地。各县(区)林地面积均在增加。2001-2005年土地利用的变化量相对较大,表明该时期土地利用类型进行了较大幅度调整,2005-2013年变化量较小,表明该时期土地利用转移幅度相对较小。汉江上游区域近年来土地利用结构进行了较大调整,生态环境也在向好的方向发展,这是实施生态保护的积极效果。
Analyzing the changes of land use types in the upper reach of Hanjiang River in recent years can reveal the changes of the ecological environment,and provide references for land use policy formulation and ecological environment protection in counties at the South-to-North Water Diversion areas.Based on the MCD12Q1 of MODIS remote sensing image data (in 2001,2005,2009 and 2013),this paper conducts the spatial-temporal analysis for land use in the entire basin and each county in the upper reach of Hanjiang River in three aspects,including the rate of land use change,the transfer of type and the degree of utilization.The results show that within the area of 92 271.44 km^2 in the upper reach of Hanjiang River,from 2001 to 2013,the area of forest land increased by 13 075.4 km^2,the water area increased by 183.66 km^2,the grassland decreased by 7 105.69 km^2,the cultivated land decreased by 6 150.45 km^2,and the urban construction land changed insignificantly.In these three periods,forest land area increased most;grassland,cultivated land and water area were mainly transferred into forest land,among which,grassland and cultivated land were also transferred to each other;urban construction land was mainly transferred to cultivated land;and the area of forest land in all counties (or districts) in the upper reach of Hanjiang River was on the increase.The changes of land use were relatively large from 2001 to 2005,which indicates that the types of land use in this period were greatly adjusted;and the changes from 2005 to 2013 is small,indicating that the extent of land use transfer during this period was relatively small.In the upper reach of Hanjiang River and in recent years,the land use structure is greatly adjusted,and the ecological environment develops for the better.which is a positive effect brought by the implementation of ecological protection.
作者
杨倩
刘登峰
刘慧
栾金凯
黄强
林木
YANG Qian;LIU Dengfeng;LIU Hui;LUAN Jinkai;HUANG Qiang;LIN Mu(State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,School of Water Resources and Hydropower,Xi'an University of Technology,Xi'an 710048,China;China Institute of Water Resources and Hydropower Research,Beijing 100038,China;School of Statistics and Mathematics,Central University of Finance and Economics,Beijing 100081,China)
出处
《人民珠江》
2019年第10期129-136,共8页
Pearl River
基金
国家重点研发计划(2017YFC0405900)
国家自然科学基金(51779203、51609270)
陕西省自然科学基础研究计划(2016JQ5105)
榆林市科技计划项目(2016-21)
关键词
土地利用变化
土地利用动态度
类型转移
利用程度
汉江上游
land use change
land use dynamics
transfer of type
degree of utilization
the upper reach of Hanjiang River
