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基于GIS平台,以2004-2005年度中巴资源卫星影像数据为信息源,结合多层环境要素数据库等,采用多要素综合分析的方法,通过人机交互式解译,综合判断并提取了新疆渭干河三角洲15 a来耕地的时空变化,并在已有的2005年新疆耕地盐渍化遥感调查数据库的支持下,对新增耕地中的盐渍化情况进行分析与研究.结果显示:1)自20世纪80年代末以来,耕地增加了6.18×104hm2,主要分布在绿洲的西南、南和东南.其中盐渍化耕地4.84×104hm2,占新增耕地的78.31%,新增耕地盐渍化较重;2)渭干河三角洲盐渍化耕地面积为16.68×104hm2,占耕地总面积的54.47%.耕地盐渍化现象普遍,主要分布在绿洲的下部边缘地带,河流中下游、地势平缓低洼等区域.盐渍化耕地呈条形状分布,在绿洲边缘带呈片状分布,边缘的重度盐渍化耕地交错分布在轻度和中度盐渍化耕地中;3)自然因素是导致耕地盐渍化的前提和物质基础,人为因素是盐渍化形成及发展的重要驱动力.
Based on the GIS platform, taking the satellite image data of China and Pakistan from 2004 to 2005 as the information source and combining with the multi-layer environmental factor database, the multi-factor comprehensive analysis method was used to interpret and judge Xinjiang Uygur The spatial and temporal changes of cultivated land in the dry-river delta for the past 15 years were analyzed and the salinization situation of newly-added cultivated land was analyzed and supported by the existing Xinjiang Remote Sensing Database of Arable Land Salinization in 2005. The results showed that: 1) Since the late 1980s, the cultivated area has increased by 6.18 × 104hm2, mainly distributed in the southwest, south and southeast of the oasis, among which the salinized cultivated land is 4.84 × 104hm2 accounting for 78.31% of the newly added cultivated land, and the newly increased cultivated land salinization 2) The area of salinized cultivated land in Weigan River Delta is 16.68 × 104hm2, accounting for 54.47% of the total cultivated land area. The phenomenon of arable land salinization is widespread and mainly distributed in the lower margin of the oasis. The middle and lower reaches of the river and the gentle low-lying terrain The salinized cultivated land is in the shape of a strip, distributed in the form of flake in the marginal zone of the oasis, and the heavily salinized cultivated land on the edge is staggeredly distributed in the lightly and moderately salinized cultivated land. 3) The natural factors are the soil salinization The preconditions and things Basis, the human factor is an important driving force of the formation and development of salinization.