Spatial and temporal variation of seed distributions in Sonoran Desert soils
Spatial and temporal variation of seed distributions in Sonoran Desert soils
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DOI：
10.2307/2844771
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发表时间：
1984
影响因子：
3.9
通讯作者：
O. Reichman
中科院分区：
文献类型：
--
作者：
O. Reichman
在美国亚利桑那州图森西北部索诺兰沙漠的十七个不同微生境中采集的样本，揭示了种子分布的空间（78倍）和时间（28倍）模式的巨大变化。种子密度最低，在正常干燥的洗涤和灌木之间的开放区域，灌木之间的中间，最高的人工和自然发生的洼地在土壤表面。有高种子密度的微生境低的整体种子密度的微型网站。小生境之间的差异是最大的高种子生产期间，往往在降雨量低的季节消失。种子密度与灌木冠层体积不相关，但与微地形凹陷的尺寸。小的或圆形的种子往往比大的或长的种子形成更高密度的斑块。
Samples taken in seventeen different microhabitats in the Sonoran Desert, NW of Tucson, Arizona (U.S.A.), revealed large variation in spatial (78-fold) and temporal (28-fold) patterns of seed distribution. Seed densities were lowest in normally dry washes and open areas between shrubs, were intermediate between shrubs, and were highest in artificial and naturally occurring depressions in the soil surface. There were microsites with high seed densities within microhabitats of low overall seed density. Differences between microhabitats were greatest during periods of high seed production and tended to disappear in seasons when rainfall was low. Seed densities were not correlated with shrub canopy volume, but were correlated with the dimensions of microtopographic depressions. Seeds which were small, or round, tended to form higher density patches than large or long seeds.