Effects of aspect on clonal reproduction and biomass allocation of layering modules of Nitraria tangutorum in nebkha dunes.
Effects of aspect on clonal reproduction and biomass allocation of layering modules of Nitraria tangutorum in nebkha dunes.
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DOI：
10.1371/journal.pone.0079927
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Jia Z
中科院分区：
文献类型：
--
作者：
Li Q;Xu J;Li H;Wang S;Yan X;Xin Z;Jiang Z;Wang L;Jia Z
许多nebha沙丘的形成依赖于无性系植物的分层。不同坡向和坡向的植物网状带微环境条件具有异质性。探讨坡向对无性系繁殖和生物量分配的影响，有助于了解物种的生态适应性。我们假设迎风面会促进分层繁殖，增加分叶和茎的生物量分配，并且在生物量较大的分层中，向向的影响更大。为了验证这些假设，我们调查了白刺腋芽发芽点的深度、分株发芽率、不定根形成点的密度以及在东北、东南、西南和西北4个层位上发芽的模块生物量。迎风面位于西北和西南方向。结果表明，西北向条件更有利于无性系繁殖，分株出苗率最高，不定形成点密度最高。在西南向分层发芽的模块中，分配给叶片和茎的生物量最大，分配给不定根的生物量最少。这个结果支持了我们的假设。与我们的假设相反，坡向对小生物量分层的影响更大。这些结果支持了纬向确实影响该物种的分层繁殖能力和生物量分配的假设。生物量较小的分层发芽模块的无性系繁殖和生物量分配受坡向的影响更大。这些结果表明，白杨的无性系生长对内布区微环境异质性有一定的响应。
The formation of many nebkha dunes relies on the layering of clonal plants. The microenvironmental conditions of such phytogenic nebkha are heterogeneous depending on the aspect and slope. Exploring the effects of aspect on clonal reproduction and biomass allocation can be useful in understanding the ecological adaptation of species. We hypothesized that on the windward side layering propagation would be promoted, that biomass allocation to leaves and stems of ramets would increase, and that the effects of aspect would be greater in the layering with larger biomass. To test these hypotheses, we surveyed the depth of germination points of axillary buds, the rate of ramet sprouting, the density of adventitious root formation points, and the biomass of modules sprouting from layering located on the NE, SE, SW and NW, aspects of Nitraria tangutorum nebkhas. The windward side was located on the NW and SW aspects. The results indicated that conditions of the NW aspect were more conducive to clonal reproduction and had the highest rate of ramet sprouting and the highest density of adventitious formation points. For the modules sprouting from layering on the SW aspect, biomass allocation to leaves and stems was greatest with biomass allocation to adventitious roots being lowest. This result supported our hypothesis. Contrary to our hypothesis, the effects of aspect were greater in layering of smaller biomass. These results support the hypothesis that aspect does affect layering propagation capacity and biomass allocation in this species. Additionally, clonal reproduction and biomass allocation of modules sprouting from layering with smaller biomass was more affected by aspect. These results suggest that the clonal growth of N. tangutorum responses to the microenvironmental heterogeneity that results from aspect of the nebkha.
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影响因子：
2.7
作者：
Flores-Torres, A.;Montana, C.
通讯作者：
Montana, C.
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3.2
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El-Bana, MI;Nijs, I;Kockelbergh, F
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Kockelbergh, F
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1.1
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通讯作者：
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