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首页> 外文期刊>Flora >Can spatial variation and inter-annual variation in precipitation explain the seed density and species richness of the germinable soil seed bank in a tropical dry forest in north-eastern Brazil?
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Can spatial variation and inter-annual variation in precipitation explain the seed density and species richness of the germinable soil seed bank in a tropical dry forest in north-eastern Brazil?

机译：降水的空间变化和年际变化是否可以解释巴西东北部热带干旱森林中可萌发的土壤种子库的种子密度和物种丰富度？

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摘要

The interaction between microhabitat and inter-annual variation in precipitation has an important role on the dynamics of the seed bank and can play a crucial role in survival and maintenance of plant populations in semi-arid environments. We hypothesized that the type of microhabitat and the inter-annual variability in precipitation can explain the richness and density of the seed bank in a semi-arid region in Brazil. The study was conducted in an area of tropical dry forest with shrub-tree physiognomy, locally called caatinga. We collected 35 soil samples in three distinct microhabitats, at the end of rainy and dry seasons, respectively, over three years, totalling 630 samples. The seed bank (richness and seed density) were determined by seedling emergence method. Over the three years, 79 species emerged from the seed bank, 64, 45 and 42 in riparian, non-riparian and rocky microhabitats, respectively. We recorded differences in species richness and average density between microhabitats and between years, with significant statistical interaction between them. Inter-annual precipitation explained 48% and 5% of the variation in richness and seed density, respectively. Spatial variation explained 7% of the species richness and 31% of the density. Our results show that the interaction between spatial variation and precipitation has an important role on the spatial and temporal heterogeneity of the richness and density of seed banks in dry environments.
机译：微生境和降水年际变化之间的相互作用对种子库的动力学起着重要作用，并且在半干旱环境下对植物种群的存活和维持起着至关重要的作用。我们假设微生境的类型和降水的年际变化可以解释巴西半干旱地区种子库的丰富度和密度。这项研究是在热带干旱森林地区进行的，该地区有灌木树相，当地称为caatinga。在三年的雨季和旱季结束时，我们分别在三个不同的微生境中收集了35个土壤样本，总计630个样本。通过幼苗出苗方法确定种子库（丰度和种子密度）。在过去的三年中，从种子库中发现了79种，分别在河岸，非河岸和岩石微生境中出现了64、45和42种。我们记录了微生境之间以及多年之间物种丰富度和平均密度的差异，它们之间存在显着的统计相互作用。年际降水分别解释了丰富度和种子密度变化的48％和5％。空间变异解释了物种丰富度的7％和密度的31％。我们的结果表明，空间变化与降水之间的相互作用对干旱环境下种子库的丰富度和密度的时空异质性具有重要作用。

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