拉萨河下游河谷风沙源分布特征及其成因
文献类型:期刊论文
作者 | 常春平 ; 邹学勇 ; 张春来 ; 黄永梅 ; 程宏 ; 赵延治 ; 全占军 ; 邱玉郡 ; 房志玲 ; 王升堂 |
刊名 | 山地学报
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出版日期 | 2006 |
卷号 | 24期号:4页码:489-497 |
关键词 | 拉萨河下游河谷 风沙源 |
其他题名 | The Characteristics and Distribution of the Source Area of AeolianThe Characteristics and Distribution of the Source Area of Aeolian Sand in the Valley of Lhasa River’s Lower Reach ,Tibet,China |
通讯作者 | 常春平 |
合作状况 | 其它 |
中文摘要 | 根据IKONOS和Quick Bird影像解译和实地调查,对拉萨河下游河谷区风沙源分布特征、沙源粒度特征、植被特征以及人类活动的作用进行了探讨。结果表明,受大中小尺度风场的影响,风沙源地沿河谷两侧呈小面积零星分布在多个地貌部位;河流冲积物是最主要的沙源,沙源粒径90%以上分布在0.25mm以下,以细沙、极细沙和粘粒成分为主,平均含量占60.69%,易于发生风沙活动;风沙活动是影响沙生植被的主导因素,植物种类和盖度能很好反映沙源地的稳定程度;特别在流动沙地和半流动沙地上,植被演替朝着有利于风沙活动发展的方向进行,是风沙活动的主要驱动因素之一,也是风沙活动不断加剧的产物。尽管自然因素是该区域风沙活动的主要成因,人类活动对其发展起到了强化作用。 |
英文摘要 | Based on IKONOS and Quickbird interpretation and field survey,the efects of human activities and charactefistic of san d distribution, ain diameter of sand SOUrCeS an d vegetation in the valley oflower reaches of Lhasa River are discussed. I1le results indicate that valley sand SOurCes distribute along fiver valley an d its two sides,in patch and particle form from slope to bottom of valley,an d have close interrelation with large,medium and small scale ofwind field in space;There ale three categories of accumulation substanceswhich are san d SOurCes in the lower reaches of Lhasa River valley:fiver alluvium ,flood depo sitand weathering substances of mountain rock.A— mong them,river alluviumis the most important sand SOurce, ain diam eter of san d SOurce is mainly made of silver san d,extreme silver sand an d sticky san d,an d over 90% of whose grain size is less t}Ian 0.25 Isls,an d inclinedto produce wind erosion.Sand activity is the dominant factor afecting sand—nurtured vegetation.Especially the vegetation on semi-fixedan d semi-movablesan d duneis af ected most seriously,species an d coverage of vegetation can well reflect the stability of san d SOun3es.Vegetation succesion is developing in the tendency in favor of sand activities, which is one of a main driving factors an d outcome of worsening sand activities.Th ong h natural factors are the main cause of the sand activities in thisarea。human activitieswil further strengthen sand activities. |
分类号 | P425.55 |
资助信息 | 国家自然科学基金(编号:40301025,10532030);国家科技攻关课题(编号:2005BA517A06)资助~~ |
语种 | 中文 |
公开日期 | 2010-08-27 |
源URL | [http://ir.imde.ac.cn/handle/131551/1674] ![]() |
专题 | 成都山地灾害与环境研究所_成都山地所知识仓储(2009年以前) |
推荐引用方式 GB/T 7714 | 常春平,邹学勇,张春来,等. 拉萨河下游河谷风沙源分布特征及其成因[J]. 山地学报,2006,24(4):489-497. |
APA | 常春平.,邹学勇.,张春来.,黄永梅.,程宏.,...&王升堂.(2006).拉萨河下游河谷风沙源分布特征及其成因.山地学报,24(4),489-497. |
MLA | 常春平,et al."拉萨河下游河谷风沙源分布特征及其成因".山地学报 24.4(2006):489-497. |
入库方式: OAI收割
来源:成都山地灾害与环境研究所
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