| 摘要: |
| 【目的】评价新疆渭干河-库车河三角洲绿洲生态风险，对绿洲生态环境保护与管理提供参考。【方法】以渭干河-库车河三角洲绿洲为研究区，利用1989，2001，2007，2013年4个时期遥感图像作为数据源，将研究区分为耕地、林地、草地、水体、盐碱地、未利用地及其他6种景观类型，计算各类型景观格局指数及生态风险指数，将研究区划分为低、较低、中等、较高、高生态风险区，之后采用地统计学的半方差法对研究区生态风险空间变化特征进行分析。【结果】1989-2013年，耕地和盐碱地面积呈增加趋势，而其他景观类型面积均有所减少。1989年，研究区低、较低、高风险区域面积所占比例较高，分别为20.7%，28.1%，20.7%，而2001，2007，2013年研究区以低、较低风险区面积所占比例较高，二者之和分别为55.3%，49.6%，71.8%。【结论】1989-2013年，渭干河-库车河三角洲绿洲的景观类型没有变化，但各类型景观面积都有变化，绿洲的生态风险程度总体上呈现降低的趋势。 |
| 关键词: 生态风险 景观格局 渭干河-库车河绿洲 新疆 |
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| 基金项目:国家自然科学基金项目（41261051,41561051） |
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| Assessment of ecological risk of Weigan-Kuqa River Delta Oasis in Xinjiang based on landscape pattern |
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KANG Xuan,WANG Xuemei
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| Abstract: |
| 【Objective】The ecological risk in Weigan-Kuqa River Delta Oasis was evaluated to provide reference for environment protection and management.【Method】The remote sensing image data of Weigan Kuqa River Delta Oasis in 1989,2001,2007 and 2013 were used to classified the study area into six types,including cultivated land,woodland,grassland,water,saline land,unutilized and other land.On the basis of calculated landscape pattern and ecological risk,the study area was divided into extremely low,low,medium,high,and extremely high ecological risk zones.Then semi variance method of ground statistics was used to analyze spatial variation characteristics of ecological risk.【Result】In 1989-2013,the areas of cultivated land and saline land increased,while other types decreased.In 1989,the low and extremely high risk areas accounted for high proportions of 28.1% and 20.7%,but in 2001,2007,and 2013,the extremely low and low risk areas accounted for high proportions of 55.3%,49.6%,and 71.8%,respectively.【Conclusion】In 1989-2013,landscape type in Weigan-Kuqa River Oasis did not change, but the areas of different types changed.The ecological risk degree of the oasis had decreasing trend in general. |
| Key words: ecological risk landscape pattern the Delta Oasis of Weigan-Kuqa River Xinjiang |
