摘要
开展县域生态风险评价可为县域生态风险防控与生态环境保护提供科学依据。以河北省唐县为研究区域,基于2000年、2007年和2018年3期土地利用数据,从风险源、风险受体暴露度、风险效应三个方面构建生态风险评价模型,对唐县未利用地转型前后的生态风险及其时空变化、影响因素进行分析。研究结果表明:2000—2018年,提供生态空间的未利用地面积显著减少,提供生态空间的草地、林地面积及提供生产空间的耕地面积和提供生活空间的城镇和居民点面积显著增加,土地利用类型变化使得生态空间向生活空间和生产空间转化。未利用地转型后,研究区生态风险略有提高,生态风险值由2000年的0.079增加到2018年的0.107,低风险区面积比例降低,中高风险区面积比例增加,总体处于较低风险水平。与生态风险相关性较大的指标有土地利用指数、建设用地比例、农田面源压力、人口压力,应合理规划开发未利用地,注意从风险源头进行生态管控,加强生态建设。研究结果对于区域未来土地利用与管控及保持生态平衡具有重要意义。
Carrying out county ecological risk assessment can provide a scientific basis for county ecological risk prevention and ecological environment protection.Taking Tang County,Hebei Province as the research area,based on the land use data of 2000,2007,and 2018,this paper constructed an ecological risk evaluation model from three aspects of risk source,risk receptor exposure,and risk effect,and analyzed the ecological risk,time-space changes,and influencing factors before and after the transformation of unused land in Tang county.The results showed that from^(2)000 to 2018,the area of unused land providing ecological space decreased significantly,the area of grassland and woodland provided ecological space,the area of cultivated land provided production space,and the area of towns and residential areas provided significantly increased living space.The change of land use type made ecological space transform into living space and production space.After the transformation of unused land,the ecological risk of the study area increased slightly from 0.079 in 2000 to 0.107 in 2018,the proportion of low-risk areas decreased,and the proportion of medium and high-risk areas increased,which was at a low-risk level.The indicators related to ecological risk were land use index,construction land proportion,farmland non-point source pressure,and population pressure.We should reasonably plan and develop unused land,pay attention to ecological control from the source of risk,and strengthen ecological construction.The results are significant for future land use and management and maintaining ecological balance.
作者
赵丽
陈雅倩
苏孟维
王雪燕
许皞
Zhao Li;Chen Yaqian;Su Mengwei;Wang Xueyan;Xu Hao(College of Land and Resources,Hebei Agricultural University,Baoding,071000,China)
出处
《中国农机化学报》
北大核心
2022年第1期167-175,共9页
Journal of Chinese Agricultural Mechanization
基金
河北省社会科学基金项目(HB18GL053)。
关键词
唐县
未利用地
土地利用转型
生态风险
Tang County
unused land
land use transformation
ecological risk
