干旱区生态环境知识资源中心(Arid): 甘肃环县天然草地植被近40年演变的研究

Arid

	甘肃环县天然草地植被近40年演变的研究
其他题名	Studies on Evolution of Natural Grassland Vegetation for 40 Years of Huan County in Gansu
	李师翁 1; 范小峰 2
来源期刊	水土保持学报
ISSN	1009-2242
出版年	2003
卷号	17 期号:6 页码:114-117
中文摘要	环县地处陇东黄土高原北部,面积9 326 km2,其天然植被为森林草原与荒漠草原过渡地带.通过对40年前后天然草地植被的比较研究,得出40年来在自然和人类共同作用下,天然草地植被演变的结果是:天然分布的原生植被基本被天然次生植被所替代,植被组成更趋于简单化,天然生长的乔木和灌木群系消失,地带性顶极植被类型短花针茅、长芒草和大针茅群系消失,小面积分布的部分群系消失,各群系中次优势种发生了改变,植被的生态学特征发生变化,生态功能显著降低,天然草地植被严重退化,造成这一结果的主要原因是人类的垦荒、砍伐和过度放牧,而非自然因素的作用.
英文摘要	The Huan County is situated at the north of the Loess plateau of Gansu eastern. The area is 9 326 km~2. The natural vegetation is situated at the regions transition from forest-sleppe to desert-steppe. The comparative studies on natural grassland vegetation at 40 years ago and present have been made. Under the influence of nature factor and human activity together, the evolution results of natural grassland vegetation are as follows. The natu-ral distributed original vegetation is replaced almost by secondary vegetation. The vegetation constitute tend to simplify, the formation of arbor and shrub natural grown disappeared. The typical zone formation of stipa breviflora, stipa bungeana, and stipa grandis vanished, and some of formation distributed small area faded out. The dominant species of each formation and the ecological characters of vegetation changed, and ecological function reduced. The natural grassland vegetation is serious degeneration, and the main reason caused those is human activities, that is cultivate, felling with axe, and excess graze, not the natural factors.
中文关键词	天然草地 ; 植被演变 ; 甘肃环县
英文关键词	natural grassland vegetation evolution Huan county of Gansu
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:1490141
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/204391
作者单位	1.兰州交通大学化学与生物工程学院, 兰州, 甘肃 730070, 中国; 2.陇东学院生物系, 庆阳, 甘肃 745000, 中国
推荐引用方式 GB/T 7714	李师翁,范小峰. 甘肃环县天然草地植被近40年演变的研究[J],2003,17(6):114-117.
APA	李师翁,&范小峰.(2003).甘肃环县天然草地植被近40年演变的研究.水土保持学报,17(6),114-117.
MLA	李师翁,et al."甘肃环县天然草地植被近40年演变的研究".水土保持学报 17.6(2003):114-117.