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	Ecological adaptation strategies of annual plants in artificial vetetation-stabilized sand dune in Shapotou region
	Zhang, JG; Li, XR; Wang, XP; Wang, G
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2004-08-01
卷号	47页码:50-60
关键词	Shapotou region Eragrostis poaeoides ecological adaptation strategy
ISSN号	1006-9313
DOI	10.1360/04zd0006
通讯作者	Zhang, JG(jguangz@public.lz.gs.cn)
英文摘要	Taking annual plant Eragrostis poaeides in the artificial vegetation-stabilized sand dune in the Shapotou Experimental Research Station as example, study has been done on the adaptation strategies of annual plants to random environment through fixed quadrat observations of population changes and fixed plant determinations of individual growth, seed germination, population dynamics, spatial distribution pattern of population, competition and regulation. During the growing season, the survival rate of annual plants depends on the precipitation intensity and precipitation duration which activate the germination of seeds. The optimal germination strategy of annual plants in this habitat during the growing season appears as continuous germination under suitable conditions. Such continuous germination is an adaptive characteristic of annual plants to random environment. In addition, the variation processes of population size and regulation mechanism of E poaeoides are studied. Statistical results of natural population in four consecutive years show that water condition in the habitat is the leading factor affecting the population dynamics of E poaeoides. During the establishment period E poaeoides had a higher death rate, but in the middle to later period they could survive stably. Due to the limitation of soil moisture, the competition among individuals for water inevitably led to self-thinning phenomena. Under very arid condition, the survival curve of annual herbs entirely appears as Deevey III type (C type), but under relatively adequate precipitation condition, the survival curve appears as intermediate type. The strategy of life history obviously appears as r-strategy. Plant species of r-strategy often occurs in the early succession stage of the communities. In the relatively adequate and evenly-distributed rainfall years, E poaeoides population exhibited a density-dependent, i.e., survival rate increased with decrease in population density. The main pattern to regulate the population number for the intraspecific competition is to regulate the highly variable initial density into a final density with narrow variation range.
收录类别	SCI
WOS关键词	BET-HEDGING GERMINATION ; WESTERN-AUSTRALIA ; DESERT ANNUALS ; SEED DORMANCY ; ARID REGION ; COMPETITION ; POPULATIONS
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000224381400006
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2556942
专题	寒区旱区环境与工程研究所
通讯作者	Zhang, JG
作者单位	Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Shapotou Desert Expt Res Stn, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Zhang, JG,Li, XR,Wang, XP,et al. Ecological adaptation strategies of annual plants in artificial vetetation-stabilized sand dune in Shapotou region[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2004,47:50-60.
APA	Zhang, JG,Li, XR,Wang, XP,&Wang, G.(2004).Ecological adaptation strategies of annual plants in artificial vetetation-stabilized sand dune in Shapotou region.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,47,50-60.
MLA	Zhang, JG,et al."Ecological adaptation strategies of annual plants in artificial vetetation-stabilized sand dune in Shapotou region".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 47(2004):50-60.

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