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首页> 外文期刊>Nordic Journal of Botany >Shading results in depletion of the soil seed bank
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Shading results in depletion of the soil seed bank

机译：阴影导致损耗的土壤种子库

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摘要

To what extent is the decline of characteristic dry alvar species related to the decline in the soil seed bank during scrub encroachment? We recorded the number of flower stems in the vegetation in relation to light attenuation along an encroachment series progressing from open alvar through small gaps inside dense scrub of Juniperus communis (cover of 60%) to intact dense scrub (cover of 100%) on the island of oland, Sweden. This measurement of potential reproduction (number of flower stems) was then compared to the number of species in the soil seed bank at each site along the alvar encroachment series. Scrub encroachment results in light attenuation between and under the shrubs. The total number of flower stems averaged over all species was similar between gaps and open alvar, but that of alvar species was significantly lower in the gaps, indicating that light attenuation could reduce their seed set. Shading in gaps is related to depletion of the soil seed bank and loss of alvar species, particularly those that do not form a persistent soil seed bank.
机译：到什么程度的衰落特性干乙烯树脂物种下降有关土壤种子库在擦洗入侵吗?记录花的茎的数量植被与光衰减从开一个入侵系列进展乙烯树脂通过小缺口在茂密的灌木丛Juniperus普通的密度(60%)的封面完好无损擦洗(100%)的封面在厄兰岛,瑞典。繁殖(花的茎数)物种的数量相比,在土壤中种子银行沿着乙烯树脂在每个站点上侵犯系列。在光衰减之间灌木。在所有物种之间的差距和相类似开放乙烯树脂,但乙烯树脂的物种差距显著降低,表明光衰减可以减少他们的种子。在缺口与损耗的阴影土壤种子库和乙烯树脂物种丧失,尤其是那些不持久土壤种子库。

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