干旱区生态环境知识资源中心(Arid): 植被覆盖度的时间变化及其防风蚀效应

Arid

	植被覆盖度的时间变化及其防风蚀效应
其他题名	VEGETATION COVER CHANGES OVER TIME AND ITS EFFECTS ON RESISTANCE TO WIND EROSION
	赵彩霞 1; 郑大玮 1; 何文清 2
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2005
卷号	29 期号:1 页码:68-73
中文摘要	在防治风蚀过程中过去人们只关注植被覆盖度的空间特性,但对其随时间变化的特性未引起足够的重视.该文着重强调了植被覆盖度随时间变化的特性,并对不同类型植物覆盖度的动态变化特征进行了研究.通过调查研究与理论分析,在土壤风蚀量与植被覆盖度及风蚀气候侵蚀因子三者之间建立了随时间变化的定量关系,并利用该公式计算和比较了不同类型植物防风治沙性能的动态差异、总植被覆盖度及相应的总土壤风蚀量的动态变化.结果表明在防风蚀的作用效应中灌木＞多年生牧草＞林木＞作物＞一年生牧草;总时空植被覆盖度与总土壤风蚀量呈"反相位"的动态变化;风蚀季节总植被覆盖度较低,介于0.11～0.14之间,低于20%的临界覆盖度,这也是该地区风蚀危害严重的一个重要原因所在.
英文摘要	Vegetation cover characteristics have both spatial and temporal components. In the past, researchers have paid particular attention to spatial characteristics of vegetation cover in protecting soil from wind’ erosion, but temporal changes in vegetation have been ignored. In this study, we examined both the spatial and temporal characteristics of vegetation cover. The monthly changes of different plant cover types were studied from June, 2002 to June, 2003 in Wuchuan County of the Inner Mongolia of China using sample thread and random step distance measures combined with photography to compare and correct possible errors. Quantitative relationships for vegetation cover types, the amount of wind erosion, and a wind erosion cli-matic factor were determined by field investigation and theoretical analysis. Using a wind erosion formula for different plant types, die total wind erosion was calculated. The results indicated that the effectiveness of dif-ferent plant types in increasing soil resistance to wind erosion were: perennial shrubs > perennial pasture > forest > annual pasture > forage crops. The dynamic annual change in total vegetation cover was inversely related to the amount of soil wind erosion. The results indicate that low vegetation cover is one of the primary causes of serious soil wind erosion in this region. Planting annual pasture and forage crops instead of perennial pasture will result in a loss of protection from wind erosion and require more land reclamation efforts in the future. Our results also suggest that the current reclamation practice of converting wind eroded landscapes to woodlands is not ecologically sound and planting shrubs or perennial pastures offers greater protection to wind erosion, especially in the more arid and semi arid regions.
中文关键词	植被覆盖度 ; 动态特征 ; 风蚀气候侵蚀因子 ; 风蚀量 ; 防风蚀效应
英文关键词	Vegetation cover Dynamic character Wind erosion climatic factor Amount of wind erosion Ef-fect of resisting wind erosion
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:1906342
来源机构	中国农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/206874
作者单位	1.中国农业大学资源与环境管理学院, 北京 100094, 中国; 2.中国农业大学农学与生物技术学院, 北京 100094, 中国
推荐引用方式 GB/T 7714	赵彩霞,郑大玮,何文清. 植被覆盖度的时间变化及其防风蚀效应[J]. 中国农业大学,2005,29(1):68-73.
APA	赵彩霞,郑大玮,&何文清.(2005).植被覆盖度的时间变化及其防风蚀效应.植物生态学报,29(1),68-73.
MLA	赵彩霞,et al."植被覆盖度的时间变化及其防风蚀效应".植物生态学报 29.1(2005):68-73.