SPATIAL AND TEMPORAL VARIATION IN THE SEED BANK OF A SEMIARID GRASSLAND
SPATIAL AND TEMPORAL VARIATION IN THE SEED BANK OF A SEMIARID GRASSLAND
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DOI：
10.2307/2444773
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发表时间：
1989-01-01
影响因子：
3
通讯作者：
LAUENROTH, WK
中科院分区：
文献类型：
--
作者：
COFFIN, DP;LAUENROTH, WK
利用土柱研究了美国科罗拉多半干旱草地种子库的时空变异性。在土壤储存的发芽种子的空间变异性进行了评估采样两个短草植物群落在相同的气候条件下，但不同的土壤质地的网站。群落之间的差异主要是一年生植物种子的结果。在两年的8个采样日期被用来评估时间变异性，这是更重要的可发芽种子的存储比空间变异。两个采样年之间的种子储存数量的差异，并在几年内的季节性。从样品中出现的幼苗数量为122 - 2，748/m2。一个穷人的对应关系被发现之间的植物群落的物种组成和可发芽的种子的存储，但是，在网站上产生的种子的物种组成往往有很高的相似性，出现的幼苗。大多数物种在种子库中的存在是短暂的，而不是持久的。
The spatial and temporal variability in the seed bank of a semiarid grassland in Colorado [USA] was evaluated using soil cores. Spatial variability in the soil storage of germinable seeds was assessed by sampling two shortgrass plant communities on sites with the same climatic conditions but differing in soil texture. Differences between communities were largely the result of annual plant seeds. Eight sampling dates over two years were used to assess temporal variability, which was more important to the storage of germinable seeds than spatial variability. Differences in the numbers of seeds stored were found between the two sampling years, and seasonally within years. The number of seedlings that emerged from the samples ranged from 122-2,748/m2. A poor correspondance was found between the species composition of the plant communities and the storage of germinable seeds; however, the species composition of the seeds produced on the sites tended to have a high similarity with the seedlings that emerged. Most of the species had a transient rather than a persistent presence in the seed bank.