Soil environmental factors drive seed density across vegetation types on the Tibetan Plateau
Soil environmental factors drive seed density across vegetation types on the Tibetan Plateau
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土壤环境因素驱动青藏高原不同植被类型的种子密度
DOI：
10.1007/s11104-017-3348-0
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发表时间：
2017-07
期刊：
影响因子：
4.9
通讯作者：
Xianhui Zhou
中科院分区：
文献类型：
--
作者：
Miaojun Ma;James Dalling;Zhen Ma;Xianhui Zhou
背景和目标土壤种子库是草原生态系统幼苗补充的重要来源，特别是在大规模干扰之后。尽管如此，人们对地上植物群落与地下过程在维持这些种子库方面的相对重要性知之甚少。 方法在这里，我们收集了 1026 个土壤种子库样本，并对 57 个地点的 171 个地上植被样方进行了采样，代表了中国青藏高原高海拔地区存在的六种不同的以草为主的植被类型。为了了解影响这些地点种子库的过程，我们研究了土壤环境变量与群落组成、密度和物种丰富度的关联。结果我们发现每种植被类型的种子库和常备植被之间的物种组成存在显着差异，而土壤种子库彼此更加相似。尽管如此，种子库的组成与土壤湿度、pH 值和有效氮显着相关（allp < 0.05）。种子密度与土壤pH值呈显着负相关，与土壤水分、土壤有机质呈显着正相关。多元回归分析表明，对于种子库密度，仅包含 pH 的模型具有最低的 AIC 值。结论土壤条件不仅影响种子投入，还影响种子在土壤中的潜在存活，本研究提出了一个框架，为土壤环境因素（化学和物理因素）对土壤种子库物种组成形成的影响提供了合理的解释。未来的工作应该通过种子埋藏实验来分离土壤化学对种子持久性的直接和间接影响。
Background and aimsSoil seed banks are an important source of seedling recruits in grassland ecosystems, particularly following large-scale disturbance. Nonetheless, the relative importance of above-ground plant communities versus below-ground processes in maintaining these seed banks is poorly understood.MethodsHere we collected 1026 soil seed bank samples and sampled 171 aboveground vegetation quadrats in 57 sites representing six distinct grass-dominated vegetation types present at high elevation on the Tibetan Plateau, China. To understand processes affecting seed banks at these sites we examined the associations of soil environmental variables with community composition, density and species richness.ResultsWe found significant differences in species composition between the seed bank and standing vegetation in each of the vegetation types, whereas soil seed banks were much more similar to each other. Nonetheless, seed bank composition was significantly associated with soil moisture, pH, and available nitrogen (allp< 0.05). Seed density was significantly negatively correlated with soil pH and positively correlated with soil moisture and soil organic matter. Multiple regression analysis showed that for seed bank density a model including pH alone had the lowest AIC value.ConclusionsSoil conditions influence not only seed inputs but also potentially seed survival in the soil, this study present a framework which supply a plausible explanation on effect of soil environment factors (chemical and physical factors) in the formation of species composition of soil seed bank. Future work should isolate the direct and indirect effects of soil chemistry on seed persistence using seed burial experiments.
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影响因子：
1.8
作者：
R. Stephenson;J. Rechcigl
通讯作者：
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影响因子：
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作者：
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DOI：
10.1073/pnas.0808254105
发表时间：
2008-11-18
影响因子：
11.1
作者：
Hartman, Wyatt H.;Richardson, Curtis J.;Bruland, Gregory L.
通讯作者：
Bruland, Gregory L.
DOI：
10.1016/b978-0-12-440405-2.50011-7
发表时间：
1989
期刊：
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影响因子：
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作者：
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通讯作者：
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影响因子：
5.2
作者：
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