摘要
利用三期(1985、1995和2000年)Landsat TM图像解译结果,应用GIS技术,分析了杂多县土地利用的数量变化和时空变化特征。结果表明:15年期间杂多县土地利用变化具有稳定微动性,但在1985~1995年和1995~2000年两个研究时段的变化特征存在明显差异。1985~1995年,土地利用转移面积为5954.00km^2,占该县总面积的16.47%,转移主要发生在草地内部及草地与未利用地之间,占总转移的93.87%,以高、中覆盖草地输出、低覆盖草地输入为特征。表现为草地数量增加,质量下降;1995~2000年,土地利用变化面积为6027.75km^2,占全县总面积的16.67%,主要转移类型为中低覆盖草地-未利用土地、中覆盖-低覆盖草地、低覆盖草地-中覆盖草地、沼泽地-草地,占总转移面积的90.87%,低覆盖草地向高、中覆盖草地正转移,草地数量减少,质量好转。两个研究时段的土地利用变化集中分布在杂多县东部、西南和西部。
Supported by GIS, the spatial-temporal pattern characters of land-use change in Zaduo County from 1985 to 2000 were analyzed based on Landsat TM digital data. Some interesting and significant findings have been obtained: (1) During the period of 1985-2000, the LUCC in Zaduo County was in small quantity, but the characters during the two periods of 1985-1995 and 1995-2000 were obviously different. (2) During the period of 1985- 1995, the total land - diversion amount was 5 954.00 km^2, accounting for 16.47 % of the total land amount in Zaduo County; land-diversion mainly occurred among different coverage degree grassland or between grassland and non-used land, accounting generally for 93.87 % of the total land-diversion amount; another character was that the amount of grassland was increased but its quality decreased. (3) During the period of 1985-1995, the total land-diversion amount was 6 027.75 km2, accounting for 16.67% of the total land amounts in Zaduo County; the main land-diversion types were from mid or low-coverage degree grassland to nonuesd land, from mid-coverage degree grassland to low-coverage degree grassland, from low-coverage degree grassland to mid-coverage degree grassland and from wetland to grassland, accounting for 90.87 % of the total land-diversion amount; the amount of grassland decreased but its quality increased. At the two periods of 1985 -1995 and 1995-2000, land-use diversion occurred obviously in the east, SW and west part of Zaduo County.
出处
《干旱地区农业研究》
CSCD
北大核心
2008年第3期236-240,共5页
Agricultural Research in the Arid Areas
基金
青海省重大科技攻关项目(2002-N-106)
关键词
土地利用变化
时空格局
GIS
澜沧江源区
杂多县
LUCC
spatial - temporal pattern
GIS
source area of Laneangjiang River
Zaduo County