Photosynthesis, growth, and decay traits in Sphagnum - a multispecies comparison.
Photosynthesis, growth, and decay traits in Sphagnum - a multispecies comparison.
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DOI：
10.1002/ece3.2119
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发表时间：
2016-05
影响因子：
2.6
通讯作者：
Rydin H
中科院分区：
文献类型：
--
作者：
Bengtsson F;Granath G;Rydin H
在北方泥炭地，泥炭藓（泥炭藓）主要控制着碳固存。我们调查了泥炭藓物种的生长和分解相关的功能性状。我们测试了环境和繁殖在驱动物种性状方面的重要性，并调查了它们之间的权衡。我们选择了15个全球重要的泥炭藓物种，代表四个部分（亚属）和泥炭地栖息地的范围。我们在标准实验室条件下测量了光合作用和分解速率，作为先天生长和腐烂潜力的衡量标准，并将其与其自然栖息地中实现的生长，生产和分解联系起来。总的来说，我们发现支持增长和分解措施之间的权衡。然而，相关性并不强，对于不同的增长与分解措施，r介于0.24和0.45之间。使用光合速率来预测在标准条件下的分解产生R 2 = 0.20。栖息地和部分（繁殖）影响的性状和权衡。在一个潮湿的一年，物种从部分Cuspidata和泥炭藓有最高的产量，但在一个干燥的一年，物种，部分和栖息地之间的差异趋于平衡。一般来说，Cuspidata物种产生容易分解的凋落物，但它们在野外的腐烂受到阻碍，可能是由于它们潮湿栖息地的近地表缺氧。在主成分分析中，PCA，光合能力，生产，和实验室分解作用在同一方向。根据植被类型和演替的物种不完全聚类，使一些种与其他人在同一节，而其他人更明显地与其他类似的植被类型的聚类。我们的研究包括了比以前泥炭藓性状分析更广泛的物种和栖息地，并表明虽然存在以前描述的生长-腐烂权衡，但它远非完美。因此，我们建议，我们的物种特异性性状措施提供了机会，泥炭地生态系统模型的改进。在实验室条件下测得的先天品质在现场反应中的转化方式不同。最引人注目的是，快速生长的物种只有在多雨的年份才能实现它们的潜力。同一种植物在室内分解速度快，但在田间分解速度慢于其他植物。这些关系对于理解泥炭地群落的长期动态至关重要。
Peat mosses (Sphagnum) largely govern carbon sequestration in Northern Hemisphere peatlands. We investigated functional traits related to growth and decomposition in Sphagnum species. We tested the importance of environment and phylogeny in driving species traits and investigated trade‐offs among them. We selected 15 globally important Sphagnum species, representing four sections (subgenera) and a range of peatland habitats. We measured rates of photosynthesis and decomposition in standard laboratory conditions as measures of innate growth and decay potential, and related this to realized growth, production, and decomposition in their natural habitats. In general, we found support for a trade‐off between measures of growth and decomposition. However, the relationships are not strong, with r ranging between 0.24 and 0.45 for different measures of growth versus decomposition. Using photosynthetic rate to predict decomposition in standard conditions yielded R 2 = 0.20. Habitat and section (phylogeny) affected the traits and the trade‐offs. In a wet year, species from sections Cuspidata and Sphagnum had the highest production, but in a dry year, differences among species, sections, and habitats evened out. Cuspidata species in general produced easily decomposable litter, but their decay in the field was hampered, probably due to near‐surface anoxia in their wet habitats. In a principal components analysis, PCA, photosynthetic capacity, production, and laboratory decomposition acted in the same direction. The species were imperfectly clustered according to vegetation type and phylogeny, so that some species clustered with others in the same section, whereas others clustered more clearly with others from similar vegetation types. Our study includes a wider range of species and habitats than previous trait analyses in Sphagnum and shows that while the previously described growth–decay trade‐off exists, it is far from perfect. We therefore suggest that our species‐specific trait measures offer opportunities for improvements of peatland ecosystem models. Innate qualities measured in laboratory conditions translate differently to field responses. Most dramatically, fast‐growing species could only realize their potential in a wet year. The same species decompose fast in laboratory, but their decomposition was more retarded in the field than that of other species. These relationships are crucial for understanding the long‐term dynamics of peatland communities.