摘要
以渝宜高速重庆段15km缓冲区为研究对象,选取1986年、2000年和2007年3期遥感影像资料和1∶5万地形图,基于景观结构中的景观干扰度指数和景观脆弱度指数构建景观生态风险指数,利用ArcGIS的空间分析和空间统计学中的空间自相关和插值分析方法,进行路域生态风险空间分布和梯度变化特征分析,得出如下结论:1)1986—2007年的21年中,研究区生态环境质量整体有所下降,生态风险指数较高的地区有所增加;2)研究区内的生态风险度具有明显的集聚特征,生态风险度较高的地区,其相邻区域的生态风险度也较高,反之亦然;3)研究区内的生态风险度呈现出时序上的差异性,1986年生态风险度的高值区分布主要在道路影响域西部地区,与非农建设用地分布集中的区域具有显著的空间相关性;2000年和2007年生态风险度的高值区聚集在东部,这主要与道路修建的时限性有关,此外研究区东部因水位抬升而引起的一系列建设也是导致路域生态环境空间变异的重要原因。
This paper describes a case study of eco-risk appraisal in the Yu-Yi Highway of Chongqing, with its＇ I5km buffer area as the research object. The appraisal was conducted hased on landscape disturbance index and landscape fragility. Spatial distribution and gradient differentiation characteristics of the eco-risks in the study area were analyzed by means of spatial statistics like spatial autoeorrelation and sub-analysis of variance. Conclusions from the study are as follows： 1） Eco-environment quality dropt to a small extent while the area with high eco-risk enlarged in the period from 1986 to 2007 in road area; 2） Eco-risk degree of the study area was obvious agglomeration, ecological risk in higher areas, the adjacent region of ecological risk is higher, and vice versa; 3） Eco risk degree of the study area showed a spatial differentiation in a long time region, eco-risk degree in the west of road area and its pe ripheral regions were high in 1986, which has a significant spatial correlation with non-agricultural construction land concentrated distribution area; but the high value area of eco-risk index＇ s of 2000 and 2007 gathered in the east, with the reason of time limit in road construction, in addition to the east of Three Gorges Reservoir area to start construction is also the cause of road ecological en vironment spatial variability.
出处
《重庆师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第3期28-34,F0003,共8页
Journal of Chongqing Normal University:Natural Science
基金
国家自然科学基金(No.40361004)
重庆市自然科学基金(No.CSTC2010BB0322)
重庆师范大学校级基金项目(No.08XLZ12)
