摘要
以甘肃省白龙江流域1990,2002,2010年土地利用数据和30 m分辨率DEM为基础,基于景观格局指数、生态环境脆弱度、地形位指数及分布指数开展白龙江流域地形位梯度上的生态风险研究.结果表明:20年间景观生态风险的水平分布格局发生了一定改变,低、较低和中等风险区的范围扩大,高和较高风险区的范围缩小;高风险、较高风险和中等风险等级的优势分布区间主要为人为活动干扰剧烈,植被覆盖度低的中低地形位区段,低风险和较低风险等级的优势分布区间主要为林草广布、植被覆盖度高的中高地形位区段;研究时段内生态风险有所缓和,但是中等风险增加,分布范围向更高的地形位扩展,高和较高生态风险的分布范围仍广泛.应针对不同地形位梯度上的生态风险区,加强资源利用规划,合理开发和利用自然资源,降低不合理生产活动与干扰的生态风险,因地制宜,进行生态建设和人类活动管控,促进甘肃省南部山区的可持续发展.
Based on 1990, 2002 and 2010 land-use data and 30 meters’ resolution DEM of Bailongjiang Watershed that incorporated a landscape index, a study of the ecological vulnerability, terrain niche index and distribution index was put forward to assess the characteristics of ecological risks on the terrain niche gradient. The results showed that in the past twenty years the distribution patterns of landscape ecological risks have changed, of which the scopes of the lower, low and medium ecological risks expended and that of the high and higher ecological risks narrowed. The dominant terrain niche zone of high, higher and medium ecological risks was in a low terrain section, where frequent human activities were intense and vegetation coverage very low, while the dominant terrain niche zone of the lower and low ecological risks was in a high section where trees and grass were widely distributed and vegetation coverage very high. During the research period, the ecological risks in the study area were eased, but the medium ecological risks increased, and extended to a higher terrain niche gradient, and higher ecological risk distribution was widespread. Integrated management of ecological risks should be taken according to the ecological risk on different terrain gradients. It is necessary to aim at different ecological risk levels in different terrain gradients, enhance the planning of natural resources and rational devel-opment and utilization of resources to reduce the ecological risks and hazards of irrational human disturbance.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第5期692-698,共7页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金项目(41271199)
中央高校基本科研业务费专项资金项目(lzujbky-2014-117
lzujbky-2014-265)
关键词
地形位指数
分布指数
景观格局
生态风险
terrain niche index
distribution index
landscape pattern
ecological risks
