干旱区生态环境知识资源中心(Arid): 民勤沙区几种荒漠植物群落的现实生态位研究

Arid

	民勤沙区几种荒漠植物群落的现实生态位研究
其他题名	Realized Niches of Several Eremophytes in Desert Communities of Minqin Desert Area
	常兆丰; 赵明; 韩福贵; 仲生年
ISSN	1000-4025
出版年	2006
卷号	26 期号:1 页码:165-173
中文摘要	民勤沙区属于典型的干旱荒漠气候，植被以灌木荒漠为主，盖度一般只有5％～15％。植物群落内生态位宽度悬殊，植物种之间的生态位相似比例很小。生态位宽度和生态位相似比例小是受制于干旱荒漠生境条件的结果，是干旱荒漠生态环境中稀疏荒漠植物的主要特征之一。植物的现实生态位宽度与年际降水量关系密切，在地貌、土壤颗粒、土壤水分、土壤养分等影响因子中，土壤水分是主导因子。当地地下水位深20m左右，植物无法利用，植物种之间对资源的竞争主要表现为对水分资源的竞争，降水资源是植物种之间竞争的关键资源。同一种植物在不同群落中的生态位宽度变幅较大，不同群落内部植物种竞争关系的差异是由物种的生态位和由相对稳定的地貌、土壤条件以及随年际变动的降水条件共同作用的结果。群落中的优势种植物的生态位最宽，当优势种生态位减小时，一年生短命植物往往会进入群落中。荒漠植物的冠层单一，以冠幅占样方面积比作为植物的特征值计算其生态位特征值比较准确可靠。
英文摘要	Minqin desert area belongs to the typical droughty desert shrubs and its vegetation coverage only comes to 5% desert climate and its 15%. In the plant vegetations are mainly communities, the niche breadths vary greatly and the similarity ratios among different plants are very low. Low niche breadth and similarity ratio,resulting from the conditions of the droughty desert habitats ,are one of the major features of sparsely distributing plants in droughty desert ecological environments. The realized-niche breadths of the plants closely relate to the annual rainfalls and soil moisture and are the dominating factor among the other factors such as landforms,soil nutrient and particles. Where water table is about 20 m,the plants can not utilize underground water and the resource competition among the plant species mainly appears as the competition for water resources among which rainfall is key one for the plant species to compete for. The niche breadths of same plants vary greatly among different communities and the competitive relations of the plant species in different communities vary depending on the combined actions of the niches of the species,stable landforms and soil conditions,and annual rainfall fluctuations. The dominant species have the widest niche breadth in the communities,and annual short-life plants many a time get into the communities while the niches of the dominant species decrease. The canopies of the desert plants are simple and thus the proportions of their canopies to the quadrat area are used as their eigenvalues to accurately and reliably calculate the eigenvalues of their niches.
中文关键词	荒漠植物 ; 生态位宽度 ; 生态位相似比例 ; 影响因子 ; 生境条件 ; 关键资源
英文关键词	desert plant niche breadth similarity ratio affecting factor habitat condition key resource
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:2329386
来源机构	甘肃省治沙研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/220276
作者单位	甘肃省治沙研究所, 甘肃省荒漠化防治重点实验室, 武威, 甘肃 733000, 中国
推荐引用方式 GB/T 7714	常兆丰,赵明,韩福贵,等. 民勤沙区几种荒漠植物群落的现实生态位研究[J]. 甘肃省治沙研究所,2006,26(1):165-173.
APA	常兆丰,赵明,韩福贵,&仲生年.(2006).民勤沙区几种荒漠植物群落的现实生态位研究.,26(1),165-173.
MLA	常兆丰,et al."民勤沙区几种荒漠植物群落的现实生态位研究".26.1(2006):165-173.