Performance of a clonal species in patchy environments: effects of environmental context on yield at local and whole-plant scales
Performance of a clonal species in patchy environments: effects of environmental context on yield at local and whole-plant scales
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DOI：
10.1007/s10682-007-9178-4
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发表时间：
2008-05-01
影响因子：
1.9
通讯作者：
Wijesinghe, Dushyantha K.
中科院分区：
文献类型：
--
作者：
Hutchings, Michael J.;Wijesinghe, Dushyantha K.
在不同的空间尺度、异质环境和均匀环境下，在提供相同养分的条件下，比较了无性繁殖植物杂交种的产量。在非均质处理中，不同斑块大小、不同质量斑块间养分浓度差异程度不同的环境。不同处理的无性系总产量差异约为2.5倍，在大斑块和高对比度的环境中最高，在小斑块和高对比度的环境中最低，在均匀条件下处于中等水平。与同质条件下的植株相比，许多异质处理在所有测量尺度上都有显著的增产或减产。这些对产量的影响反映了对生长条件的局部响应以及由于与植物在不同条件下生长的其他部分的生理整合而对这些响应的修改，支持了de Kroon等人的建议（2005 New Phytol 166:73-82）。结果表明，植物在所有尺度上的产量都强烈依赖于环境背景，并且只有在有限的异质条件下才能实现最大产量。
Yield of the clonal plant Glechoma hederacea was compared at different spatial scales, in heterogeneous and homogeneous environments providing the same amount of nutrients. For the heterogeneous treatments, environments were created with different patch sizes and different degrees of contrast in nutrient concentration between patches of different quality. Total clone yield differed by almost 2.5-fold across treatments, being highest in environments with large patches and high contrast, lowest in environments with small patches and high contrast, and intermediate under homogeneous conditions. Compared with plants in homogeneous conditions, there were significant increases or decreases in yield at all scales of measurement in many of the heterogeneous treatments. These effects on yield reflected a combination of local responses to growing conditions and modification of these responses due to physiological integration with other parts of the plant growing in contrasting conditions, supporting the proposal of de Kroon et al. (2005 New Phytol 166:73-82). The results show that plant yield at all scales is strongly dependent on environmental context, and that maximum yield can only be realized under a limited range of heterogeneous conditions.