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生态系统观测研究网络在地球系统科学中的作用

ISSN号：1007-6301
期刊名称：地理科学进展
时间：0
页码：13-15
语言：中文
分类：P461.7[天文地球—大气科学及气象学] S127[农业科学—农业基础科学]
作者机构：[1]Department of Automatic Control, School of Automation, Beijing Institute of Technology, Beijing 100081, China, [2]State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China, [3]Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing 100101, China, [4]Centre for Hydrology, Micrometeorology and Climate Change, Department of Civil and Environmental Engineering, University College Cork, Cork, Ireland
相关基金：The authors wish to express their gratitude to the National Natural Science Foundation of China （40621061） and the Project of Chinese Academy of Sciences （KZCX2-XB2-02-31） for their financial support. Thanks go to two anonymous reviewers for their kindly improving the manuscript.
相关项目：土地利用与生态过程

关键词：空间分布, 植被活动, 土地覆盖, 流域, 梯度, 干旱, 地形, 中国, Vertical distribution of land cover, Anthropogenic activity, Vegetation activity, Environmental variability, China

中文摘要：

人为的活动在描绘风景变得越来越重要，但是他们的影响被自然环境仍然限制。这篇论文通过描述陆地盖子和植被活动的空间分发讨论人为的活动，植被活动和地形学的相互作用(由规范的差别植被索引代表了， NDVI ) 在西南的中国的一个多山的区域的地志的坡度。我们的结果显示存在风景模式被人为的活动以及地志的因素控制。集中的人为的活动主要与相对低的举起发生在区域，轻轻并且凹面斜坡这些区域容易、方便到达为人。因为由人的破坏，某陆地盖子打字(主要草地和灌木) 仅仅在相对更严厉的环境被发现。这研究也发现那个地志的湿索引在另外的地方使用的(W) 仅仅反映流量产生能力，然而并非在这个区域显示土壤水内容的真实空间模式。在 NDVI 和 W 之间的关系，和 NDVI 和长度斜坡因素(LSF ) 证明流量和侵蚀在植被活动有复杂效果。W 和 LSF 的更大的价值将导致更强壮的能力生产流量和运输沉积，并且从而增加土壤水内容和土壤免职，而在某个阀值以外流量和侵蚀是那么强壮的他们将自毁植被生长。这研究提供需要成功地恢复本国的植被，改进陆地管理，并且支持在多山的区域的持续开发的信息，特别为开发区域。

英文摘要：

Anthropogenic activities have become more and more important in characterizing the landscape, but their impacts are still restricted by natural environments. This paper discusses the interactions of anthropogenic activity, vegetation activity and topography through describing the spatial distribution of land cover and vegetation activity （represented by Normalized Difference Vegetation Index, NDVI） along topographic gradient in a mountainous area of southwestern China. Our results indicate that the existing landscape pattern is controlled by anthropogenic activities as well as topographic factors. Intensive anthropogenic activities mainly occur in areas with relatively low elevation, gentle and concave slopes, as these areas are easy and convenient to attain for human. Because of the destruction by human, some land cover types （mainly grassland and shrub） are only found in relatively harsher environments. This study also finds that topographic wetness index （W） used in other places only reflects runoff generation capacity, but not indicate the real spatial pattern of soil water content in this area. The relationships between NDVI and W, and NDVI and length slope factor （LSF） show that runoff and erosion have complex effects on vegetation activity. Greater values of W and LSF will lead to stronger capacity to produce runoff and transport sediment, and thereby increase soil water content and soil deposition, whereas beyond a certain threshold runoff and erosion are so strong that they would destruct vegetation growth. This study provides information needed to successfully restore native vegetation, improve land management, and promote sustainable development in mountainous areas, especially for developing regions.

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