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Growth, nitrogen and tannins of semi-arid savanna saplings in response to herbivory and water

机译:半干旱稀树草原幼树对草食和水的生长,氮和单宁含量

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Large herbivores and water availability are important factors determining the growth of woody plants from the sapling stage to the adult stage and hence the abundance of woody plants in African savannas. We tested specific predictions derived from the growth-differentiation balance hypothesis that either severe browsing intensity or low watering frequency (i) reduce plant height, stem circumference, plant mass or new shoot abundance, or (ii) reduce nitrogen or condensed tannin concentrations. We applied four levels of browsing by domestic goats and three levels of watering frequency to saplings growing in pots in two experiments under a clear plastic roof. One experiment was on Combretum apiculatum and the other was on Dichrostachys cinerea. Our predictions were not consistently supported by both experiments. However, the responses did indirectly suggest that C apiculatum saplings were more prone than D. cinerea saplings to carbon limitation (e.g., reduced abundance of new shoots, reduced tannin concentration) under either severe browsing or low watering frequency. We attributed this difference to the contrasting morphology of the two species and concluded that the extent to which severe herbivory or water stress limit the recruitment of adult woody plants in semi-arid savannas is species-dependent. (C) 2016 Elsevier Ltd. All rights reserved.
机译:大量的草食动物和水供应是决定木本植物从树苗到成年的生长以及非洲大草原上木本植物丰富的重要因素。我们测试了来自生长-分化平衡假说的特定预测,即严格的浏览强度或低浇水频率(i)降低株高,茎周长,植物质量或新枝丰度,或(ii)降低氮素或单宁浓度降低。我们在透明塑料屋顶下进行的两个实验中,对家养的树苗应用了四个等级的家养山羊浏览和三个等级的浇水频率。一项实验是在尖顶Combretum上进行的,另一项实验是在灰暗的Dichrostachys cinerea上进行。两个实验均未一致支持我们的预测。但是,这些反应确实间接表明,无论是在严重浏览还是在低浇水频率下,尖齿小树苗都比灰葡萄小树苗更易受碳限制(例如,减少新芽的丰度,降低单宁浓度)。我们将此差异归因于两个物种的形态差异,并得出结论,严重的食草或水分胁迫限制了半干旱热带稀树草原上成年木本植物的募集与否取决于物种。 (C)2016 Elsevier Ltd.保留所有权利。

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