Seedling emergence on Sonoran Desert dunes

被引:35
作者
Bowers, JE
机构
[1] U.S. Geological Survey, Tucson, AZ 85745
关键词
dunes; seed size; seedling emergence; Sonoran Desert;
D O I
10.1006/jare.1996.0046
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Seedling emergence of psammophiles (plants restricted to active dunes) was examined with germination experiments and with field observations at the Algodones Dunes, California, U.S.A., and the Sierra del Rosario Dunes, Sonora, Mexico. In the field, perennial psammophiles germinated in response to smaller rainfall triggers (greater than or equal to 10mm) than other woody desert plants (greater than or equal to 16mm). In germination experiments, seedlings of three perennial psammophiles, Astragalus magdalenae var. peirsonii, Helianthus niveus subsp. tephrodes, and Palafoxia arida var. gigantea emerged in larger numbers from greater soil depths than those of three nonpsammophiles, Cercidium microphyllum, Fouquieria splendens, and Palafoxia arida var. arida. Seed size for these six species did not correlate in any consistent fashion with emergence depth, suggesting that food reserves are nor the only variable that ensures emergence of deeply buried psammophile seeds. (C) 1996 Academic Press Limited
引用
收藏
页码:63 / 72
页数:10
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