干旱区生态环境知识资源中心(Arid): 民勤荒漠植被的形成与演替过程及其发展趋势

Arid

	民勤荒漠植被的形成与演替过程及其发展趋势
其他题名	A Primary Study on the Succession of Desert Process of Formation and Vegetation in Minqin
	常兆丰; 刘虎俊; 赵明; 韩福贵; 仲生年; 唐进年
ISSN	1003-7578
出版年	2007
卷号	21 期号:7 页码:116-124
中文摘要	甘肃省民勤县是我国的典型荒漠化地区，自西汉以来生态环境逐渐退化，植被经历了一个从沼泽植被到盐生草甸植被再到荒漠植被的退化过程。水资源的变化是决定当地植被退化的主导因子，在大面积湖泊、河流背景上是沼泽植被，在干涸湖泊、河床背景上的是盐生草甸植被，在沙质荒漠背景上的是荒漠植被。目前，荒漠植被正处于进一步退化过程中。退化演替的同一阶段存在多种演替过程，现阶段存在着荒漠植被退化演替和盐生草甸植被向荒漠植被演替2种退化过程。20世纪中叶，在当地是从盐生草甸植被向荒漠植被演替的过渡时期，20世纪50年代以来，荒漠植被逐渐占据了优势。目前的天然种子植物共有22个科，72个属，127个种，其中以典型荒漠为主，共有3个植被型，7个群系组，17个群系。植物种类少，群落结构简单，群落随生境的分异性较大。目前的植被正处在进一步退化过程中，植物种类和面积减少，大面积枯梢、死亡，优势种的优势度增大。现阶段决定荒漠植被生长状况的主要是大气降水，植被盖度和密度随年际降水量变化较大，尤其是一年生草本植物。目前影响植被退化的人为因素主要是上游来水量减少，地下水严重超采、草场严重超载和造林密度过大等。在干旱内陆盆地，一旦水资源供给减少，湖盆、河道干涸，泥沙出露，形成沙漠和沙漠化则是必然结果。
英文摘要	The Minqin County is a typical desert area in China.The natural environment of Minqin has been degenerating since the Western Han Dynasty;The vegetation has undergone a degeneration process from swamp to vegetation-halophyte and to meadow-desert vegetation.The water resources change is a leading factor in the vegetation degeneration there;The swamp vegetation was based on the background of large-scale lakes and rivers;the halophyte meadow was based on the background of dry lakes and riverside,and desert vegetation was based on the background of desert;desert vegetation was based on the background of desert at present.And now,the desert vegetation is in course of gradual degeneration.There are multi-courses of succession in the same phase.There were two courses of desert vegetation degeneration and vegetation-halophyte degenerating to desert vegetation.In middle period of 20 centuries,it was the transition period that transited from vegetation-halophyte to desert vegetation.Since 50’s of 20 centuries,the desert vegetation has been dominating gradually.At present,there is natural vegetation with 22 families,72 genes and 127species.The typical desert predominates in the vegetation can be divided into 3 vegetation types,7formation groups,and 17formations;and community with fewer species,simple structure disparts greatly by environment at there.At nowadays,the vegetation has been gradually degeneratied,in the instance the species and area of distribution decrease and dull or died in large area,while the domination degree of domination plant reinforce.The precipitation is a determinative role for plant growth at present.The change of vegetation coverage is very large with annual rainfall,especially annual plant.The main elements affect the degeneration of vegetation are human activities including water reducing,severely over-taking underground water,over-grazing and excessive density of forestry at present.In arid drainage basin,when water resources is shortage,the lake and watercourse will dry up,sand emerge,as a result,desert and desertification would to be inevitable.
中文关键词	典型荒漠化 ; 生态 ; 植被 ; 演替 ; 退化 ; 民勤
英文关键词	typical desertification ecology vegetation succession degeneration Minqin
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:2978088
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/221066
作者单位	甘肃民勤荒漠草地生态系统国家野外科学观测研究站, 武威, 甘肃 733000, 中国
推荐引用方式 GB/T 7714	常兆丰,刘虎俊,赵明,等. 民勤荒漠植被的形成与演替过程及其发展趋势[J],2007,21(7):116-124.
APA	常兆丰,刘虎俊,赵明,韩福贵,仲生年,&唐进年.(2007).民勤荒漠植被的形成与演替过程及其发展趋势.,21(7),116-124.
MLA	常兆丰,et al."民勤荒漠植被的形成与演替过程及其发展趋势".21.7(2007):116-124.