川西北高原区生态环境脆弱性评价

Evaluation of Ecological Environment Vulnerability in the Northwest Plateau Area of Sichuan

为及时掌握川西北高原区生态环境脆弱性状况,以RS和GIS为技术手段,选择高程、坡度、土地利用类型等9项指标,完成了该地区2000-2015年生态环境脆弱性评价分析。结果表明:(1)整个高原区生态环境的脆弱性呈现自西向东逐渐降低的变化趋势。(2)微度和重度栅格比例分居最大和最小,潜在、轻度和中度比例依次递减,且轻度及以下栅格比例达到75%以上,该地区整体处于中等脆弱水平。(3)整体趋势变化分析表明,15年内该地区脆弱程度明显加重的区域仅有6.92%,而明显好转和未发生明显变化的区域占据93.08%,区域生态环境整体处于明显好转的变化状态。(4)驱动力分析表明,系列生态环境保护措施的实施是主要驱使地区生态环境好转的因素,而大量水电基地的建设也对较小部分地区的脆弱程度产生一定威胁。

In order to grasp the ecological environment vulnerability in the northwest plateau area of Sichuan in time,we evaluated and analyzed the ecological environment vulnerability in the region was and from 2000 to 2015 by using RS and GIS as technical means,and 9 indicators such as elevation,slope and land use type.The results showed that:(1)the ecological environment vulnerability of the whole region showed the decreasing trend from west to east;(2)the ratios of grids in micro and severe vulnerable areas were the largest and the smallest,respectively;potential,mild,and moderate centered and decreased in turn,and the proportion of grids in mild and below levels of vulnerability was more than 75%,and the region as a whole was at a moderate level of vulnerability;(3)the analysis of the overall trend showed that in the past 15 years,only 6.92%of the areas presented the obvious aggravation of vulnerability,while 93.08%of the areas presented the obvious improvement and no obvious change,and the overall ecological environment of the region was in a state of marked improvement;(4)the driving force analysis showed that the implementation of a series of ecological environment protection measures was the main factor on driving the improvement of regional ecological environment,and the construction of a large number of hydropower bases also posed the threat to the vulnerability of smaller parts.