摘要
基于大渡河流域的地理国情(地势陡峻,林草地广布),改进了土壤可蚀性因子K、坡度坡长因子LS和植被盖度因子C的提取方法,构建了大渡河流域土壤流失方程,进而分析和探讨了2005—2015年大渡河流域土壤侵蚀时空变化分布格局及其驱动机制。研究结果表明:(1)大渡河流域总体上属于轻度侵蚀,其空间格局表现为小面积的高强度侵蚀,主要分布于中上游地区的高山峡谷地带以及下游的泸定县、九龙县、汉源县、峨边彝族自治县等地区。(2) 2005—2015年,大渡河流域土壤侵蚀变化状况呈现总体稳定,局部加剧的态势。(3)近十年国家退耕还林还草政策的实施有效地改善了流域水土流失状况,然而不合理的人类活动和频繁的地质灾害(特别是地震)极大地加剧了区域土壤侵蚀强度。研究成果可以为西南山区,特别是横断山区的土壤侵蚀量估算提供重要借鉴,对区域水土保持的防治具有重要参考意义。
Based on the geographic conditions,such as steep terrain and widely distributed forest and grassland,the soil loss equation of Dadu River basin was constructed.The quantitative calculations of soil erosion intensity in2005and2015were conducted,and then the tempo-spatial patterns of soil erosion during2005to2015and its driving mechanisms were analyzed and discussed.The results showed that:(1)The average soil erosions belonged to the level of mild erosion.The soil erosion of severe intensity was concentrated in the area of the upper reaches in the mountain valleys and the lower reaches including Luding County,Jiulong County,Hanyuan County and Leshan City.(2)During2005to2015,the changes of soil erosion in Dadu River Catchment showed a tendency of overall stability and local intensification.(3)During the past ten years,the implementation of returning farmland to forest and grassland policy had effectively mitigated soil erosion,however,the unreasonable human activities(such as the steep slope reclamation,extensive cultivation,and deforestation etc.)and frequent geological disasters both greatly exacerbated the soil erosion in the study area.The results can provide an important reference for the estimation of soil erosion in the mountainous areas of Southwest China,especially in Hengduan Mountains and play an important role in the prevention and control of soil and water conservation.
作者
郭兵
刘丽峰
姜琳
范业稳
张慧
何田莉
GUO Bing;LIU Lifeng;JIANG Lin;FAN Yewen;ZHANG Hui;HE Tianli(School of Architectural Engineering,Shandong University of Technology,Zibo 255049,China;Key Laboratory of Geographic Information Science (Ministry of Education),East China Normal University,Shanghai 200241,China;State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,China)
出处
《山东理工大学学报（自然科学版）》
CAS
2019年第2期7-13,共7页
Journal of Shandong University of Technology:Natural Science Edition
基金
山东省自然科学基金项目(ZR2018BD001)
华东师范大学地理信息科学教育部重点实验室开放基金项目(KLGIS2017A02)
资源与环境信息系统国家重点实验室开放基金项目
关键词
土壤流失方程
RUSLE
空间格局
大渡河流域
退耕还林
soil loss equation
RUSLE
spatial pattern
Dadu River catchment
returning farmland to forest
