引用本文:王涛,徐澜,胡阳,张宇攀,韦倩,等.陕北无定河流域土壤侵蚀时空演变[J].环境科学研究,2017,30(9):1355-1364.
WANG Tao,XU Lan,HU Yang,ZHANG Yupan,WEI Qian,et al.Spatial and Temporal Changes of Soil Erosion in Wuding River Basin, Shaanxi Province, China[J].Reserrch of Environmental Science,2017,30(9):1355-1364.]
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 275次   下载 398 本文二维码信息
码上扫一扫!
分享到: 微信 更多
陕北无定河流域土壤侵蚀时空演变
王 涛1,2,3, 徐 澜2, 胡 阳2, 张宇攀2, 韦 倩2
1.中国科学院水利部水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西 杨凌 712100 ;2.西安科技大学测绘科学与技术学院, 陕西 西安 710054 ;3.西北大学城市与环境学院, 陕西 西安 710127
摘要:
为了深入认识陕北无定河流域土壤侵蚀时空演变过程及其与降雨和植被NDVI变化的关系,采用基于RUSLE(修正通用土壤流失方程)的土壤侵蚀评估方法,开展流域土壤侵蚀时空分布及其与降雨、植被NDVI的关系研究. 结果表明:①2000—2014年无定河流域多年均土壤侵蚀模数为457.90 t/(km2·a),呈波动增加过程. 流域土壤侵蚀以微度侵蚀为主,占流域总面积的88.35%,其他土壤侵蚀等级面积比例随等级升高而减少. 研究时段内除微度侵蚀面积比例减少外,其他土壤侵蚀等级面积比例均呈增加过程,并且侵蚀面积年变化速率也由微度侵蚀的0.52%降至剧烈侵蚀的0.01%. ②无定河流域西北部土壤侵蚀程度最低,西南部其次,东南部最高,与其地貌类型及降水量沿东南—西北方向递减有关,但均反映出流域2000—2014年土壤侵蚀的增加过程. 研究时段内流域不同土壤侵蚀等级间面积及比例转移主要由低等级土壤侵蚀类型转为相邻高等级土壤侵蚀类型. ③无定河流域土壤侵蚀与降水量、侵蚀性降雨量、降雨侵蚀力呈显著正相关(P<0.01),相关系数分别为0.90、0.95和0.98,而与植被NDVI的关系不显著. 研究显示,降雨变化尤其是侵蚀性降雨(≥12 mm/d)增加是陕北无定河流域土壤侵蚀增强的主要原因.
关键词:  降雨侵蚀力  土壤侵蚀  时空变化  无定河流域
DOI:
分类号:
基金项目:黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金项目(A314021402-1616);国家自然科学基金项目(41501571);陕西省大学生创新训练计划项目(201610704073)
Spatial and Temporal Changes of Soil Erosion in Wuding River Basin, Shaanxi Province, China
WANG Tao1,2,3, XU Lan2, HU Yang2, ZHANG Yupan2, WEI Qian2
1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Water and Soil Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China ;2.College of Geomatics, Xi′an University of Science and Technology, Xi′an 710054, China ;3.College of Urban and Environmental Science, Northwest University, Xi′an 710127, China
Abstract:
Abstract: Based on the Revised Universal Soil Loss Equation (RUSLE), the temporal and spatial evolution of soil erosion and possible relationship with rainfall and NDVI were investigated for the Wuding River Basin in northern Shaanxi province. The results showed that:(1) The average annual soil erosion in the Wuding River Basin modulated around 457.90 t/(km2·a), and showed an increase in volatility. The main soil erosion type was slight erosion, accounting for 88.35%, while the area of other soil erosion type decreased as the soil erosion level increased. In addition to the decrease in area and proportion of slight erosion, the other soil erosion type increased, and the change rate also decreased from 0.51% each year for the slight soil erosion type to 0.01% each year for severe erosion. (2) In order to clearly show the status of soil erosion in different regions, three small areas in the southeast, southwest, and northwest of the Wuding River Basin were selected. Soil erosion modulation was the highest in the southeast area, followed by the southwest area, and the northern area in the Wuding River Basin was the lowest. The distribution of soil erosion modulation was related to landforms and decreased rainfall from the southeast to the northwest, which reflected the increased process of soil erosion in the Wuding River Basin from 2000 to 2014. (3) The correlations between soil erosion modulation and rainfall, erosive rainfall, and rainfall erosivity were significantly positive, with respective correlation coefficients 0.90,0.95 and 0.98, but the correlation between soil erosion and NDVI was not significant. Thus, changes of rainfall, especially the increase of erosive rainfall (≥12 mm/d), were the main reason for the enhanced soil erosion of the Wuding River Basin.
Key words:  rainfall erosivity  soil erosion  spatial and temporal change  Wuding River Basin