摘要
为探究高原山地综合地域的水土流失敏感性时空演变规律,揭示其水土流失敏感性状况,以承德市为研究区,基于USLE模型选取评价因子构建水土流失敏感性指数模型,并借助ArcGis 10.2平台评价2009年、2013年和2017年承德市水土流失敏感性。研究结果表明:(1)影响承德水土流失敏感性变化的主要因子是降雨侵蚀力和植被覆盖与管理因子。(2)轻度、中度敏感是承德水土流失敏感性的主要表现;且敏感性等级由东南向西北逐渐减弱是其主要变化趋势。(3)近年来,承德水土流失敏感性整体呈上升趋势,以轻度敏感上升至中度敏感为主,且敏感性上升速度有加速趋势。(4)承德南部地区,由于山高陡峭和土壤可蚀性、降水、植被覆盖因子的影响,其水土侵蚀敏感性较高,属于水土流失重灾区。针对以上情况,结合承德实际情况,特提出两点建议,以期为承德市建立生态环境预警机制和山水林田湖草生态修复措施提供思路,为承德市国土空间格局优化、制定管控机制和保护性开发措施等提供参考。
The research aims to explore the temporal and spatial evolution of soil erosion sensitivity in plateau and mountainous district,and to reveal the sensitive situation of soil erosion.Taking Chengde City as the research area,we selected the evaluation index based on the USLE model to construct the soil erosion sensitivity index model,and then with the support of ArcGis 10.2,the sensitivity of soil erosion in Chengde in 2009,2013 and 2017 was evaluated.The results showed that:(1)the main factors effecting the change of the sensitivity of soil erosion in Chengde were rainfall erosivity,vegetation coverage and management.(2)The soil erosion sensitivity in Chengde was mainly at mild and moderate degree,and the sensitivity level showed a decreasing trend from southeast to northwest.(3)In recent years,the sensitivity of soil erosion in Chengde had generally increased,mainly from mild to moderate degree,and the increase rate in sensitivity had accelerated.(4)Due to the high mountain steepness and the influence of soil erodibility,precipitation and vegetation coverage factors,the soil erosion in southern part of Chengde was highly sensitive,so it belonged to the highly damaged area of soil erosion.In view of the above situation,combined with the actual situation of Chengde,two suggestions were put forward to provide ideas for the establishment of an ecological environment early warning mechanism and ecological restoration measures of landscape,forest,field,lake,and grass in Chengde.Besides,this paper can provide references for the optimization of the land spatial development pattern in Chengde,the formulation control mechanisms and protective development measures.
作者
贾学斌
张超
朱永明
JIA Xuebin;ZHANG Chao;ZHU Yongming(College of Land and Resources,Hebei Agricultural University,Baoding 071000,China;2Beijing Miyun District Agricultural Mechanization Technology Extension Service Station,Beijing 101500,China)
出处
《林业与生态科学》
2020年第1期37-47,共11页
Forestry and Ecological Sciences
基金
河北省社会科学基金(HB17GL060)。
关键词
USLE
水土流失
敏感性
承德市
时空演变
USLE
soil erosion
sensitivity
Chengde City
temporal and spatial evolution
