Non-neutral patterns of species abundance in grassland communities
Non-neutral patterns of species abundance in grassland communities
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DOI：
10.1111/j.1461-0248.2005.00836.x
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发表时间：
2006-01-01
期刊：
影响因子：
8.8
通讯作者：
Tilman, D
中科院分区：
文献类型：
--
作者：
Harpole, WS;Tilman, D
虽然在明尼苏达州草原植物物种丰富度的分布与中性理论是一致的，生态位，而不是中性的机制支持的物种性状的能力，以预测物种丰富度在三个实验草地社区。特别是，从27个物种在单一栽培中生长的数据表明，物种在一个性状，R*，这是每个物种降低土壤硝酸盐的浓度，限制土壤养分的水平，并预测与氮（N）的竞争能力呈负相关。在这些N-有限的栖息地，物种丰度等级与其预测的竞争等级：低R* 物种，平均占主导地位。这些相关性与中性理论的预期显著不同，中性理论假设物种性状的交换。此外，我们发现环境变化（N-添加或干扰）后相对丰度的变化不是中性的，但也与R* 显着相关。
Although the distribution of plant species abundance in a Minnesota grassland was consistent with neutral theory, niche but not neutral mechanisms were supported by the ability of species traits to predict species abundances in three experimental grassland communities. In particular, data from 27 species grown in monoculture showed that species differed in a trait, R*, which is the level to which each species reduced the concentration of soil nitrate, the limiting soil nutrient and which is predicted to be inversely associated with competitive ability for nitrogen (N). In these N-limited habitats, species abundance ranks correlated with their predicted competitive ranks: low R* species, on average dominated. These correlations were significantly different than expected for neutral theory, which assumes the exchangeability of species traits. Additionally, we found that changes in relative abundance after environmental change (N-addition or disturbance) were not neutral but also were significantly associated with R*.