The fate of seeds after dispersal in chalk grassland: the role of the bryophyte layer
The fate of seeds after dispersal in chalk grassland: the role of the bryophyte layer
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DOI：
10.2307/3565661
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发表时间：
1988-07
期刊：
影响因子：
3.4
通讯作者：
B. F. V. Tooren;B. F. V. Tooren
中科院分区：
文献类型：
--
作者：
B. F. V. Tooren;B. F. V. Tooren
本研究的目的是量化决定粉笔草场种子扩散后命运的因素：扩散后的捕食、在土壤表面的运输、并入土壤，最后萌发。种子散布后的捕食估计约占释放种子总数的30-70%。对于一个物种，当种子被苔藓植物覆盖时，捕食行为会减少。种子沿土壤表面的横向运移大多局限在几厘米以内。在当地，大量的种子可能会积聚在一片片的苔藓植物中。冬天，种子被埋在土壤里几厘米深的地方。在这一时期，10%-20%的种子被吸收，小种子比大种子快。只有很小一部分埋藏的种子会再次到达上层土壤。
The aim of this study was to quantify the factors determining the fate of seeds after dispersal in a chalk grassland: post-dispersal predation, transport over the soil surface, incorporation into the soil, and finally germination. Post-dispersal predation of seeds was estimated at about 30-70% of the total number of released seeds. For one species predation was reduced when the seeds were covered by a bryophyte layer. Lateral transport of seeds along soil surface was for most seeds limited to a few cm. Locally, large numbers of seeds may accumulate in patches of bryophytes. Seeds were incorporated into the soil to a depth of a few cm during winter. In this period 10-20% of the seeds were incorporated; small seeds faster than large seeds. Only a very small part of the buried seeds will reach the upper soil layers again.