干旱区生态环境知识资源中心(Arid): Effect of Amount and Frequency of Precipitation on Seedling Establishment and Survival of Lane Mountain Milkvetch (Astragalus jaegerianus Munz).

Arid

报告编号	ADA482584
	Effect of Amount and Frequency of Precipitation on Seedling Establishment and Survival of Lane Mountain Milkvetch (Astragalus jaegerianus Munz).
	Rundel, P. W; Prigge, B. A; Sharifi, M. R.
英文摘要	The Lane Mountain milkvetch (Astragalus jaegerianus Munz) is an endangered perennial herb and is one of few plant species narrowly endemic to the central Mojave Desert. Its populations are threatened primarily by physical disturbance and habitat fragmentation. Rare recruitment events and the plant’s short life span result in extreme fluctuations in population size from high numbers following a successful recruitment year to very low numbers following several years of average or below average precipitation. Our field studies indicate that in addition to total precipitation, frequency and timing of precipitation are critical for successful recruitment. In a greenhouse study, we grew milkvetch under nine artificial rainfall treatments: 3 amounts (100, 150, and 200 mm/wet season) x 3 frequencies (1,2, and 4 times per month) of precipitation. Our results indicate that 200 mm of precipitation with a frequency of four times per month is required for seedlings to attain a level of development that enables them to endure a summer drought and resprout in the next growing season. We conclude that exceptionally above average and frequent precipitation is required for recruitment to occur. Such conditions are estimated to occur once in about every 10 years in the central Mojave Desert.
英文关键词	Rainfall Deserts Plant growth Survival(General) Artificial precipitation Drought Habitats Fragmentation Extinction Astragalus jaegerianus munz Lane mountain milkvetch Seedling establishment Artificial rainfall Perennial herbs F
出版年	2007
语种	英语
国家	United States
来源学科分类	57C - Botany ; 57Z - Zoology ; 57H - Ecology
URL	http://r.cnki.net/KCMS/detail/detail.aspx?DbCode=KJBG&dbname=KJBGW&filename=59fff95531c97d1c38951da5
来源机构	Non Paid ADAS
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/273511
推荐引用方式 GB/T 7714	Rundel, P. W,Prigge, B. A,Sharifi, M. R.. Effect of Amount and Frequency of Precipitation on Seedling Establishment and Survival of Lane Mountain Milkvetch (Astragalus jaegerianus Munz).,2007.