Life history strategy influences biomass allocation in response to limiting nutrients and water in an arid system
Life history strategy influences biomass allocation in response to limiting nutrients and water in an arid system
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发表时间：
2012
影响因子：
0.5
通讯作者：
Wei Mao;Ginger R. H. Allington;Y.-L. Li;Tonghui Zhang;X.-Y. Zhao;S. Wang
中科院分区：
文献类型：
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作者：
Wei Mao;Ginger R. H. Allington;Y.-L. Li;Tonghui Zhang;X.-Y. Zhao;S. Wang
最优分配理论（OPT）预测，植物应该将相对更多的生物量分配给获得最有限资源的器官。然而，植物部分之间的生物量分配的变化也可以随着植物尺寸的增长而发生。作为一种替代方法，异速生长生物量分配理论（APT）认为，植物应该权衡其生物量之间的根，茎和叶，这种方法可以最大限度地减少偏见时，比较生物量分配模式的会计在分析中的植物大小。分析了一年生狗尾草（Setaria viridis（L.）本研究通过对北方科尔沁桑迪多年生狼尾草（Pennisetum centrasiaticum Tzvel）和Beauv在不同土壤养分和水分有效性条件下（夏季和冬季添加）的生物量分配策略的比较，推测两种植物对不同土壤水分和氮素含量的响应具有不同的生物量分配策略。在考虑了植物个体大小后，提出了S.不同氮素处理下，紫花苜蓿和中甸苜蓿的叶片和根冠比（RTS）存在差异。不同土壤氮素含量对绿僵菌的响应均为“真”。根系的可塑性对土壤含水量的波动也是“真实的”。然而，在响应氮和水的过程中，中甸松表现出不同的模式，生物量分配策略没有发生变化。调整了各器官生物量分配格局。viridis对氮和水分限制的反应是显着的，这表明S. viridis支持最优分割理论（optimal partitioning theory，OPT）。中甸松对环境的适应性较强，更符合异速生长生物量分配理论，这一特性可能使中甸松在脆弱生境中保持优势。
The optimal partitioning theory (OPT) predicts that a plant should allocate relatively more biomass to the organs that acquire the most limiting resource. However, variation in biomass allocation among plant parts can also occur as a plant grows in size. As an alternative approach, allometric biomass partitioning theory (APT) asserts that plants should trade off their biomass between roots, stems and leaves, and this approach can minimize bias when comparing biomass allocation patterns by accounting for plant size in the analysis. We analyzed the biomass allocation strategy of the two species: annual Setaria viridis (L.) Beauv and perennial Pennisetum centrasiaticum Tzvel from the Horqin Sandy Land of northern China by treating them with different availabilities of soil nutrient and water (added in summer and winter), and hypothesized that the two species have different patterns of biomass allocation strategy in response to different soil water content and soil nitrogen content. After taking plant size into account, the biomass allocation strategy of S. viridis and P. centrasiaticum differed in response to nitrogen and water; leaves and root:shoot ratio (RTS) of S. viridis were “true” in response to various soil nitrogen contents. The plasticity of roots was also “true” in response to fluctuation in soil water content. However, P. centrasiaticum showed a different pattern with no shift of biomass allocation strategy in response to nitrogen and water. Adjustment in organs biomass allocation pattern of S. viridis in response to nitrogen and water limitation was dramatic, this suggested that S. viridis support optimal partitioning theory (OPT). P. centrasiaticum has better tolerance to varied environments and more likely support the allometric biomass partitioning theory (APT), this characteristic may allow P. centrasiaticum to keep dominance in fragile habitats.