[1]欧阳琰,沈渭寿,杨 凯,等.近20 a雅鲁藏布江流域冻融侵蚀演变趋势[J].山地学报,2014,(04):417.
　OUYANG Yan,SHEN Weishou,YANG Kai,et al.The Trend of Freezethaw Erosion in Yarlung Zangbo River Basin in Nearly Twenty Years[J].Mountain Research,2014,(04):417.
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近20 a雅鲁藏布江流域冻融侵蚀演变趋势()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2014年04期
页码:
417
栏目:
青藏高原土壤
出版日期:
2014-04-01

文章信息/Info

Title:
The Trend of Freezethaw Erosion in Yarlung Zangbo River Basin in Nearly Twenty Years
作者:
欧阳琰; 沈渭寿; 杨 凯; 林乃峰
环境保护部 南京环境科学研究所，江苏 南京 210042
Author(s):
OUYANG Yan;  SHEN Weishou; YANG Kai; LIN Naifeng
1.Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042,China
关键词:
雅鲁藏布江流域; 冻融侵蚀; 年降水量; 气温年较差; 植被覆盖度
Keywords:
Yarlung Zangbo River Basin;  freezethaw erosion;  annual precipitation;  annual average temperature;  vegetation coverage
分类号:
P931.4，S157
文献标志码:
A
摘要:
西藏冻融侵蚀面积约占中国的冻融侵蚀面积的73%。采用1990年、2000年和2010年3期TM影像、土地利用图和植被类型图相叠加，对雅鲁藏布江（简称雅江）流域近20 a的冻融侵蚀进行目视解译，并且统计冻融侵蚀强度和侵蚀面积。结合气温、降水和植被覆盖度的变化，探讨引起冻融侵蚀面积和强度变化的原因。研究结果表明：1.近20 a雅江流域冻融侵蚀总面积略有下降，下降比例约为35%；轻度侵蚀区持续增加，面积由1990年的21 2136 km2增加到2010年的31 5262 km2，增加幅度为56%；中度侵蚀区持续减少,面积由1990年的55 96426 km2减少到2010年的42 71812 km2，减少幅度为236%；重度侵蚀区面积变化不显著。至2010年雅江流域的侵蚀格局发生改变，由原先的中度侵蚀主体型逐步向轻度侵蚀、中度侵蚀混合型过渡。2.雅江流域冻融侵蚀主要分布在北部高海拔地区，南部湖盆谷地分布较少，流域内冻融侵蚀主要集中在海拔4 500~6 000 m范围内。近20 a间流域内重度侵蚀区逐渐向东移动，由日喀则北部地区渐移至拉萨、那曲、昌都一线。侵蚀强度整体呈现减弱趋势，在日喀则地区，林芝地区和山南地区均出现轻度侵蚀逐渐替代中度侵蚀的现象。
Abstract:
Freezethaw erosion area in Tibet accounted for about 73% of the area in China, and it has become one of the three types of soil erosion. we get the freezethaw erosion area by visual interpretation，cover three stage TM image, land use map and vegetation type map for interpretation. we Statistics the area and the intensity of erosion. Results show that:(1)The freezethaw erosion area slightly in Yajiang River Basin in recent twenty years, and the decline in the ratio about 35%. Mild erosion area increase continuously, from 21 2136 km2 in 1990 to 31 5262 km2, increased by 56%. Moderate erosion area continued to decline. area reduced to 42 71812 km2 from 55 96426 km2 in 1990, decreased by 236%. Severe erosion area did not change significantly. In 2010 Yajiang watershed erosion pattern happening change, already from the original moderate erosion main body into mild, moderate erosion erosion of mixed type. (2)The freezethaw erosion areas of Yarlung Zangbo River Basin mainly distribute on the Northern region with a elevation range between 4 500 to 6 000 kilometers, comparatively speaking, freezethaw erosion in Southern lake basins and valleys is not that serious. For nearly two decades, Severe erosion areas of Yarlung Zangbo River Basin have been moving eastward from the north Xigaze to areas along Lhasa,Nagqu and Chamdo.In a whole, soil erosion in this area is decreasing, it is slight erosion displace moderate erosion gradually in areas such as Xigaze, Nyingtri and Shannan.

相似文献/References:

[1]张建国,刘淑珍,范建容.基于GIS的四川省冻融侵蚀界定与评价[J].山地学报,2005,(02):248.
[2]刘淑珍,张建国,辜世贤,等.西藏自治区土壤侵蚀类型研究[J].山地学报,2006,(05):592.

备注/Memo

备注/Memo:
收稿日期(Received date)：2013-08-13；修回日期（Accepted）：2013-12-11。
基金项目（Foundation item）：国家环保公益性行业科研专项（200909050和201209032）资助。\[This project is funded by the National Special Public Welware Study on Environmental Protection in China(200909050 and 201209032).\]
作者简介（Biography）：欧阳琰（1979-），男，博士，江苏南京人，副研究员，主要从事全球气候变化的响应与反馈方面的研究。\[Ouyang Yan(1979-),male,Ph D, Jiangsu Nanjing,researcher associate,mainly engaged in response and feedback of global climate change.\]E-mail：oyy0723@163.com *
通信作者(Corresponding author): 沈渭寿（Shen Weishou）
更新日期/Last Update: 1900-01-01