Soil Erosion under Different Land Use Types and Zones of Jinsha River Basin in Yunnan Province,China

来源 :Journal of Mountain Science | 被引量 : 0次 | 上传用户:wzq558
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Severe soil erosion in the middle and upper reaches of Yangtze River has been regarded as a major environmental problem. The on-site impact of soil erosion on agricultural production and the off-site impact on floods and sedimentation in Yangtze Rive are well known. A quantitative assessment of soil erosion intensity is still scanty for developing appropriate soil erosion control measures for different land use types and zones in this region. This article constructs a localized USLE and estimates the average soil loss in the Jinsha River Region in Yunnan Province, one of the priority areas for soil erosion control in the middle and upper reaches of Yangtze River. The estimation is done under different land uses and zones in this basin. The estimation shows that while soil erosion in the cultivated land is the most severe, 36~40% of the garden and forest land suffers from soil erosion of various degrees due to lack of ground cover and other factors. Soil erosion in the pasture is modest when the ground cover is well maintained. It also confirmed that terracing can reduce soil erosion intensity significantly on the cultivated land. Research findings suggest that sufficient attention must be paid to regeneration of the ground cover in reforestation programs. In addition to mass reforestation efforts, restoration of grassland and terracing of the cultivated land should also play an important role in erosion control. Severe soil erosion in the middle and upper reaches of Yangtze River has been viewed as a major environmental problem. The on-site impact of soil erosion on agricultural production and the off-site impact on floods and sedimentation in Yangtze Rive are well known. A quantitative assessment of soil erosion intensity is still scanty for developing appropriate soil erosion control measures for different land use types and zones in this region. This article constructs a localized USLE and estimates the average soil loss in the Jinsha River Region in Yunnan Province, one of the priority areas for soil erosion control in the middle and upper reaches of Yangtze River. The estimation is done under different land uses and zones in this basin. The estimation shows that while soil erosion in the cultivated land is the most severe, 36-40 % of the garden and forest land suffers from soil erosion of various degrees due to lack of ground cover and other factors. Soil erosion in the pasture is modest when the ground cover is well maintained. It also confirmed that terracing can reduce soil erosion intensity significantly on the cultivated land. Research findings recommend that fully attention must be paid to regeneration of the ground cover in reforestation programs. In addition to mass reforestation efforts, restoration of grassland and terracing of the cultivated land should also play an important role in erosion control.
其他文献
摘要:网络技术的迅速发展给社会和人们的生活带来了巨大的变化,网络舆论这一新生事物也随着时代潮流应运而生。网络舆论是一把“双刃剑”,在推动社会发展的同时,也给我们带来了诸多问题。因此,积极营造健康、理性、和谐的绿色网络舆论是当前形势所趋。  关键词:网络时代 绿色网络舆论 和谐社会 新闻媒体    作为一种新兴的社会信息传播途径,网络已经成为继报刊、电视、广播之后的第四媒体。网络正在以其独特的方式悄
“兴趣是最好的老师。”怎样才能激发学生学习音乐的兴趣呢?学生学习的兴趣和愿望是一种内动力,激发学生对所学知识的兴趣是提高有效教学的重要因素。只有在学生感兴趣的情境