摘要
城市化过程中建设用地的扩展势必会侵占耕地、草地等生态用地,破坏生态系统的结构和功能,因此明确城市扩展中的生态风险变化对城市用地规划和风险防控具有重要意义。本研究以呼和浩特市区为对象,基于城市扩展建立"因子-暴露-影响-响应"的生态风险综合评价体系,对研究区1990、2001、2010和2016年生态风险进行时空评价和风险分级。结果表明:呼和浩特市城市用地规模不断扩大,扩展速率和强度呈上升趋势;各辖区建设用地扩展强度大小及变化趋势有明显差异;时间上,呼和浩特市及其四辖区的综合生态风险值呈上升趋势;呼和浩特市风险等级由较低演变为中,风险值与建设用地扩展强度间有较强的关联性;空间上,综合生态风险等级以建成区为中心由内向外逐渐降低,风险值的空间变化受建设用地扩展强度影响显著;呼和浩特市面积占比最大的风险等级由较低演变为中;四辖区的各风险等级占比情况差异明显,风险值大小总体表现为玉泉区>回民区>赛罕区>新城区,与建设用地扩展强度表现一致。
The expansion of construction land during urbanization is bound to occupy the cultivated land,grassland,and other ecological lands,and to destroy ecosystem structure and function.Clarifying the change of ecological risk in urban expansion is of great significance for urban land planning and risk control. Here,we established an ecological risk evaluation system of"HazardsExposure-Influence-Response"based on the urban land expansion in Hohhot. The ecological risk of Hohhot in 1990,2001,2010,and 2016 was assessed and ranked. The results showed that the scope of urban land in Hohhot was expanding continuously,with increasing expansion rate and intensity. There were significant differences in the expansion intensity and change tendency of construction land among the four precincts of Hohhot. Temporally,the comprehensive ecolo-gical risk of Hohhot and its four precincts showed an upward trend. The ecological risk increased from low level to moderate level. There was a strong correlation between risk value and urbanization intensity index. Spatially,the comprehensive ecological risk level was gradually reduced from urban center to the edge. The spatial variation of risk value was affected by urbanization intensity.The highest risk proportion in Hohhot was from lower level to moderate level. There was a significant difference in the proportion of risk levels among the four precincts. The comprehensive ecological risk values of the four precincts were represented by Yuquan > Huimin > Saihan > Xincheng,which is consistent with the urbanization intensity index.
作者
马晨阳
甄江红
冯琰玮
峰一
陶云
韩帅
MA Chen-yang;ZHEN Jiang-hong;FENG Yan-wei;FENG Yi;TAO Yun;HAN Shuai(College of Geography Science,Inner Mongolia Normal University,Hohhot 010022,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2019年第11期3472-3479,共8页
Chinese Journal of Ecology
基金
国家自然科学基金项目(41761032,41261109)
内蒙古自治区自然科学基金项目(2016MS0410)
内蒙古师范大学硕士研究生科研创新基金项目(CXJJS18100)资助
关键词
呼和浩特市
城市扩展
综合生态风险
风险分级
时空评价
Hohhot
urban expansion
comprehensive ecological risk
risk grading
space-time evaluation