艾比湖流域气溶胶光学厚度与土地覆被景观格局关联分析

发布时间：2018-10-16 21:48

【摘要】：土地覆被-景观格局直接或间接影响大气环境,了解大气环境对土地覆被-景观格局的响应,对维护和改善生态环境具有重要的意义。该研究基于环境一号卫星HJ-1B CCD数据,研究艾比湖流域土地覆被-景观格局与气溶胶光学厚度(aerosol optical depth,AOD)的关联关系,首先通过CCD数据反演AOD,然后利用分维数分析和贡献分析方法,定量分析土地覆被-景观格局对AOD的影响。结果表明:1)研究区AOD主要集中于绿洲及人口集聚区,从绿洲的中心到绿洲边缘气溶胶光学厚度逐渐降低,且在南部山区集聚呈带状;2)流域平均AOD与景观指数PD、ED、LSI和AI之间均存在着高度相关性,且景观的组成和空间结构都影响着流域AOD的空间分布;3)通过分维数分析,可知耕地和盐渍地的AOD密度从高值中心到外边界下降,但在其他的土地覆被类型上变化相反,盐渍地和耕地是流域主要空气污染的贡献者;4)应用贡献分析法进一步阐明了耕地和盐渍地可以增加空气污染,而林草地的效果相反。土地覆被变化和人类活动是影响艾比湖流域AOD空间分布主要原因,对AOD与土地覆被-景观格局变化的定量研究可以使研究者更好地了解AOD与土地覆被-景观格局的关系,进一步为土地政策的制定和土地利用规划提供参考。
[Abstract]:The land cover-landscape pattern directly or indirectly affects the atmosphere environment, understands the atmospheric environment response to the land cover-landscape pattern, has the important significance to the maintenance and the improvement ecological environment. Based on the environmental 1 satellite HJ-1B CCD data, the correlation between land cover landscape pattern and aerosol optical thickness (aerosol optical depth,AOD) in the Ebinur Lake basin was studied. Firstly, the AOD, was retrieved by CCD data, and then the fractal dimension analysis and contribution analysis method were used to study the correlation between the land cover landscape pattern and aerosol optical thickness (aerosol optical depth,AOD). The effect of land cover-landscape pattern on AOD was analyzed quantitatively. The results show that: 1) AOD is mainly concentrated in the oasis and population gathering area, and the aerosol optical thickness decreases gradually from the center of the oasis to the edge of the oasis. There is a high correlation between average AOD and landscape index PD,ED,LSI and AI, and the composition and spatial structure of landscape affect the spatial distribution of AOD. The AOD density of cultivated land and saline land decreased from high value center to outside boundary, but the change of other land cover types was opposite. Salinized land and cultivated land are the main contributors of air pollution in the basin. 4) the contribution analysis method is applied to further clarify that cultivated land and saline land can increase air pollution, but the effect of forest and grassland is opposite. Land cover change and human activities are the main factors influencing the spatial distribution of AOD in Ebinur Lake basin. The quantitative study on AOD and land cover landscape pattern change can make researchers understand better the relationship between AOD and land cover landscape pattern. Further for the formulation of land policy and land use planning to provide a reference.
【作者单位】：新疆大学资源与环境科学学院;新疆大学绿洲生态教育部重点实验室;新疆智慧城市与环境建模普通高校重点实验室;
【基金】：国家自然科学基金项目(41361045;41130531);国家自然科学基金(新疆联合本地优秀青年人才培养专项)(U1503302)
【分类号】：X513;P901

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