Arid
DOI10.1007/s004420100779
The influence of climatic variability on local populations dynamics of Cercidium microphyllum (foothill paloverde)
Bowers, JE; Turner, RM
通讯作者Bowers, JE
来源期刊OECOLOGIA
ISSN0029-8549
出版年2002
卷号130期号:1页码:105-113
英文摘要

This study investigated correlations among climatic variability, population age structure, and seedling survival of a dominant Sonoran Desert tree, Cercidium microphyllum (foothill paloverde), at Tucson, Arizona, USA. A major goal was to determine whether wet years promote seedling establishment and thereby, determine population structure. Plant age was estimated from basal circumference for a sample of 980 living and dead trees in twelve 0.5-ha plots. Ages ranged from 1 to 181 years. Age frequency distribution showed that the population is in decline. Most (51.2%) of the 814 living trees were 40-80 years old; only 6.5% were younger than 20 years. The average age of the 166 dead trees was 78 years. Fifty-nine percent of dead trees were aged 60-100 years. Survival of newly emerged seedlings was monitored for 7 years in a 557-m(2) permanent plot. Mean survival in the 1st year of life was 1.7%. Only 2 of 1,008 seedlings lived longer than 1 year. Length of survival was not correlated with rainfall. Residual regeneration, an index of the difference between predicted arid observed cohort size, showed that regeneration was high during the first half of the twentieth century and poor after the mid-1950s. Trends in regeneration did not reflect interannual variation in seasonal temperature or rain before 1950, that is, in the years before urban warming. Taken together, the seedling study and the regeneration analysis suggest that local population dynamics reflect biotic factors to such an extent that population age structure might not always be a reliable clue to past climatic influences.


英文关键词age frequency distribution mortality regeneration Sonoran Desert survivorship
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000173032500012
WOS关键词SONORAN DESERT ; VEGETATION CHANGE ; ESTABLISHMENT ; DEMOGRAPHY ; SEEDLINGS ; GROWTH ; CACTI
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/143475
作者单位(1)US Geol Survey, Tucson, AZ 85745 USA
推荐引用方式
GB/T 7714
Bowers, JE,Turner, RM. The influence of climatic variability on local populations dynamics of Cercidium microphyllum (foothill paloverde)[J]. United States Geological Survey,2002,130(1):105-113.
APA Bowers, JE,&Turner, RM.(2002).The influence of climatic variability on local populations dynamics of Cercidium microphyllum (foothill paloverde).OECOLOGIA,130(1),105-113.
MLA Bowers, JE,et al."The influence of climatic variability on local populations dynamics of Cercidium microphyllum (foothill paloverde)".OECOLOGIA 130.1(2002):105-113.
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