近35a来疏勒河中下游绿洲化-荒漠化时空变化

发布时间：2018-01-12 22:15

本文关键词：近35a来疏勒河中下游绿洲化-荒漠化时空变化　出处：《干旱区研究》2016年06期 　论文类型：期刊论文

【摘要】：以疏勒河中下游为例,以1977、1986、1993、2002、2011年的Landsat影像为数据源,利用GIS和相关统计方法,分析荒漠化和绿洲化相互作用的演变过程。结果表明:1区域绿洲快速扩张,增加了937.85 km2,2002—2011年扩张速度最大,增速有所降低;荒漠面积变化幅度较小,呈先增后减的趋势,总的来说,1977—1986年以荒漠扩张为主,1986—2011年以绿洲扩张为主。2绿洲的变化趋势指数持续增加,绿洲-荒漠生态系统向着非平衡态势发展。3绿洲-荒漠双向转移趋于剧烈,其变化区域主要集中在疏勒河沿岸和绿洲-荒漠过渡带;绿洲扩张主要由于戈壁和盐碱地的开发和改造,荒漠扩张则主要是由于草地、耕地及水域的减少。农业人口的快速增长、移民政策是绿洲化和荒漠化演变过程的主要影响因素。
[Abstract]:Taking the middle and lower reaches of Shule River as an example, taking the Landsat images from 1987 / 1986 / 1993 / 2002 and 2011 as data sources, using GIS and related statistical methods. The evolution process of the interaction between desertification and oasis is analyzed. The results show that the oasis in the area of "1: 1" is expanding rapidly, with an increase of 937.85 km ~ (2) and the fastest expansion rate from 2002 to 2011. The growth rate has decreased; The change range of desert area was small, which increased first and then decreased. In general, desert expansion dominated in 1977-1986. From 1986 to 2011, the oasis expansion was the main trend index of the oasis, and the oasis-desert ecosystem developed to the non-equilibrium situation. 3 oasis-desert bidirectional transfer tended to be violent. The change regions are mainly located along the Shule River and in the Oasis-desert transitional zone. Oasis expansion is mainly due to the development and transformation of Gobi and saline-alkali land, while desert expansion is mainly due to the decrease of grassland, cultivated land and water area, and the rapid growth of agricultural population. Immigration policy is the main influencing factor of oasis and desertification evolution.
【作者单位】：兰州大学资源环境学院西部环境教育部重点实验室;
【基金】：国家科技支撑计划(2012BAC19B09) 兰州大学中央高校基本科研业务费专项资金项目(lzujbky-2013-m02)
【分类号】：P237;P901;P208
【正文快照】： 土地利用/覆被变化是全球变化研究的核心内容〔1〕,是土地变化科学和景观生态学研究的前沿和热点〔2-3〕。区域土地利用变化受自然环境和社会经济的共同影响〔4-5〕,是人地关系的直接体现。干旱区的土地利用变化主要表现为绿洲化和荒漠化〔6-7〕,荒漠化是各种因素所造成的干旱

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