Relationship between reproductive allocation and relative abundance among 32 species of a Tibetan alpine meadow: effects of fertilization and grazing.
Relationship between reproductive allocation and relative abundance among 32 species of a Tibetan alpine meadow: effects of fertilization and grazing.
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青藏高原高寒草甸32种物种生殖分配与相对丰度的关系：施肥和放牧的影响
DOI：
10.1371/journal.pone.0035448
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Du G
中科院分区：
文献类型：
--
作者：
Niu K;Schmid B;Choler P;Du G
研究背景了解物种性状与物种多度之间的关系是生态学和生物多样性科学的重要目标。虽然理论研究预测，性状有关的性能（如生殖分配）是最直接的联系在一起的物种丰富度在一个社区，经验调查很少做。目前还不清楚放牧或施肥等环境因素如何影响预测的关系。方法在青藏高原高寒草甸进行了为期3年的田间试验，以评估植物生殖分配（RA）和物种相对多度（SRA）之间的关系在控制，放牧和施肥的地块。总体而言，所研究的植物群落包含32种常见物种。在处理水平上，（i）RA与对照地块和施肥地块第一年的SRA呈负相关。(ii)没有负RA-SRA的相关性，观察放牧地块，并在第二和第三年施肥地块。(iii)对照地种子大小与SRA呈正相关。在样地水平上，SRA与RA之间的相关性不受处理、年份和物种组成的影响。结论/意义我们的研究表明，与表现相关的性状RA会对群落内的SRA产生负面影响，这可能是由于克隆生长（用于空间占用）和有性生殖之间的权衡。我们认为，如果不同的物种占据不同的位置沿着这些权衡，它将有助于维护生物多样性在当地社区，甚至在更大的规模。
Background Understanding the relationship between species traits and species abundance is an important goal in ecology and biodiversity science. Although theoretical studies predict that traits related to performance (e.g. reproductive allocation) are most directly linked to species abundance within a community, empirical investigations have rarely been done. It also remains unclear how environmental factors such as grazing or fertilizer application affect the predicted relationship. Methodology We conducted a 3-year field experiment in a Tibetan alpine meadow to assess the relationship between plant reproductive allocation (RA) and species relative abundance (SRA) on control, grazed and fertilized plots. Overall, the studied plant community contained 32 common species. Principal Findings At the treatment level, (i) RA was negatively correlated with SRA on control plots and during the first year on fertilized plots. (ii) No negative RA–SRA correlations were observed on grazed plots and during the second and third year on fertilized plots. (iii) Seed size was positively correlated with SRA on control plots. At the plot level, the correlation between SRA and RA were not affected by treatment, year or species composition. Conclusions/Significance Our study shows that the performance-related trait RA can negatively affect SRA within communities, which is possibly due to the tradeoffs between clonal growth (for space occupancy) and sexual reproduction. We propose that if different species occupy different positions along these tradeoffs it will contribute to biodiversity maintenance in local communities or even at lager scale.
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