摘要
以内蒙古赤峰市为例,利用TM影像解译得到的三期土地利用数据(1988、1995、2000年)研究20世纪80年代以来,典型农牧交错区的LUCC演化过程,主要采用土地利用开发度、耗减度、信息熵、空间转移矩阵等方法分析了不同阶段农牧交替演化的时空特征。结果表明:(1)草地、耕地、林地为研究区主要的土地利用方式,整个研究时段内,耕地开垦和草地减少是主导LUCC过程。耕地开垦面积达2424.12km2,草地减少1959.65km2。从前后两个时期来看,前期(1988-1995年)耕地和草地变化更为剧烈,耕地以增为主,草地以减为主;后期(1995-2000年)草地转出速度放缓,但耕地开垦速度仍相对较快,林地转出速度加快;(2)土地流转过程以农牧交替演化为主,前期草地与耕地的交替转化剧烈,草地开垦面积达到2 040.50km2,耕地撂荒还草634.75km2,耕地开垦主要集中在敖汉旗的北部;后期LUCC过程放缓,草地转耕地面积为828.50km2,主要发生在敖汉旗以及林西县北部地区等区域,伴随着一定程度的弃耕;(3)三个时期土地利用结构信息熵分别为1.290、1.301、1.304,赤峰市土地利用系统有序程度在降低。农牧交错演化过程的分析,为研究该地区人类-环境耦合系统的变化和机制提供了重要依据。
The paper took Chifeng City of Inner Mongolia, a typical agro-pastoral transitional zone, as an example to investigate land use change process from 1988 to 2000 based on three periods of land-use data （ 1988,1995, and 2000） which were acquired from interpretation of TM images. The Land Exploitation Degree, the Land Conversion Degree, the information entropy, and spatial conversion matrix were adopted for finding characteristics of land use change especially land cultivation from grassland and cropland abandonment for grassland in two stages. The results showed that：（ 1 ）Land reclamation and grassland decreasing were main land use change processes in the whole stage. The area of cultivated land increased by 2 424. 12km2 ,and grassland reduced by 1 959. 65km2 ; （2） Compa- ring the two periods, in the first stage from 1988 to 1995 ,the changes between cultivated land and grassland were a- cute ,and reached 2 040. 50kin2 and concentrated in the north of Aohan County ,634. 75km2 in the opposite direct from cropland to grassland. Unused land also was conversed into grassland with a large area in Kerqin County; in the other stage from 1995 to 2000 ,the land use change speed slowed down. And main changes were the conversion of grassland and forest into cultivated land. There was an area of 828.50km2 of grassland turning to be cultivated in Aohan County and the north of Linxi County; （ 3 ） The information entropy for land use structure in three periods were 1. 290,1. 301, and 1. 304, respectively, showed that the order manner for land use system was in reduction. The study revealed the transitions of grassland cultivation and cropland abandonment from 1980 to 2000, and pro- vided supports for accurate portrait of regional ecological security and human-environmental coupling system.
出处
《地球信息科学》
CSCD
北大核心
2009年第4期413-420,共8页
Geo-information Science
基金
国家科技支撑计划"生态系统格局与结构变化的遥感监测技术研发"课题(2006BAC08B03)
中科院知识创新重大项目"耕地资源和耕地产粮能力监测与预警"课题(KSCX1-YW-09-01)
关键词
农牧交错区
LUCC
农牧交替演化
赤峰市
agro-pastoral transitional zone
LUCC
alternation of farming and grazing
Chifeng City
cultivated land
