喀斯特山区城市边缘区生态风险时空演变研究——以贵州省贵阳“两湖一库”地区为例

发布时间：2018-05-28 01:16

本文选题：土地利用 + 覆盖变化　；参考：《人民长江》2017年21期

【摘要】：为揭示土地利用变化对喀斯特山区城市边缘区生态风险影响,选择贵阳"两湖一库"地区18个乡镇作为研究区域,利用1973年MSS影像、1993年TM影像、2001年ETM影像和2010年的ALOS影像获取"两湖一库"土地利用信息,从风险源的危险性、风险受体的抵抗力稳定性上构建土地利用生态风险评价模型,以乡镇行政区划为基本单元,量化评估"两湖一库"地区生态风险时空变化特征。研究表明:"两湖一库"地区40 a来生态风险指数整体先增加后减小,1973~1993,1993~2001年两个年段分别增加279.06%,21.90%;2001~2010年段减少115.52%。生态风险单项指标除土地利用破碎化程度不断增加外,其余指标都在恶化后有所好转。"两湖一库"地区生态风险状况空间差异显著,生态修复以及城市扩张的双向影响导致生态风险变化在空间上分异,具体表现为建成区所在南明区、云岩区以及湖区所在红枫湖镇、夏云镇、高峰镇生态风险值增加后基本维持不变,而建成区周围的久安镇、石板镇、金竹镇等乡镇生态风险值逐渐降低。
[Abstract]:In order to reveal the impact of land use change on ecological risk in urban fringe of karst mountain area, 18 villages and towns in Guiyang "two lakes and one reservoir" area were selected as study areas. Land use information was obtained from 1973 MSS image, 1993 TM image, 2001 ETM image and 2010 ALOS image. The evaluation model of land use ecological risk was constructed from the risk of risk source and resistance stability of risk receptor. Taking the township administrative division as the basic unit, the spatial and temporal characteristics of ecological risk in the area of "two lakes and one reservoir" were quantitatively evaluated. The results show that the ecological risk index in the area of "two lakes and one reservoir" increased first in the past 40 years and then decreased in the period of 1993-1993 and 1993-2001, and increased by 279.06 and 21.90 respectively in the period of 2001 ~ 2010. The ecological risk index decreased by 115.52 in the period from 2001 to 2010. Except for the increasing degree of fragmentation of land use, the other indexes of ecological risk have improved after deterioration. " The spatial difference of ecological risk situation between two lakes and one reservoir is significant. The bidirectional effects of ecological restoration and urban expansion lead to the spatial differentiation of ecological risk changes, which is manifested in the Nanming District where the built area is located. The ecological risk values of Hongfeng Town, Xia Yun Town and Gaofeng Town, which are located in Yunyan District and Lake District, are kept unchanged after increasing, while the ecological risk values of Jiu'an Town, Shi Ban Town, Jinzhu Town and other towns around the built area gradually decrease.
【作者单位】：重庆师范大学地理与旅游学院;贵州省山地资源研究所;
【基金】：国家自然科学基金项目“喀斯特城市边缘带土地利用/覆盖变化及其环境效应”(41261038)
【分类号】：F301.2

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