Higher photosynthetic capacity and different functional trait scaling relationships in erect bryophytes compared with prostrate species
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- 作者：Zhe Wang ; Xin Liu ; Weikai Bao
- 关键词：Growth form ; Life form ; Light interception ; Nutrient distribution ; Photosynthetic performance
- 刊名：Oecologia
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：180
- 期：2
- 页码：359-369
- 全文大小：902 KB
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Xin Liu (1)
Weikai Bao (1)
1. Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu, 610041, Sichuan, People’s Republic of China - 刊物类别：Biomedical and Life Sciences
- 刊物主题：Life Sciences
Ecology
Plant Sciences - 出版者：Springer Berlin / Heidelberg
- ISSN：1432-1939
文摘
Ecophysiological studies of bryophytes have generally been conducted at the shoot or canopy scale. However, their growth forms are diverse, and knowledge of whether bryophytes with different shoot structures have different functional trait levels and scaling relationships is limited. We collected 27 bryophyte species and categorised them into two groups based on their growth forms: erect and prostrate species. Twenty-one morphological, nutrient and photosynthetic traits were quantified. Trait levels and bivariate trait scaling relationships across species were compared between the two groups. The two groups had similar mean values for shoot mass per area (SMA), light saturation point and mass-based nitrogen (Nmass) and phosphorus concentrations. Erect bryophytes possessed higher values for mass-based chlorophyll concentration (Chlmass), light-saturated assimilation rate (A mass) and photosynthetic nitrogen/phosphorus use efficiency. Nmass, Chlmass and A mass were positively related, and these traits were negatively associated with SMA. Furthermore, the slope of the regression of Nmass versus Chlmass was steeper for erect bryophytes than that for prostrate bryophytes, whereas this pattern was reversed for the relationship between Chlmass and A mass. In conclusion, erect bryophytes possess higher photosynthetic capacities than prostrate species. Furthermore, erect bryophytes invest more nitrogen in chloroplast pigments to improve their light-harvesting ability, while the structure of prostrate species permits more efficient light capture. This study confirms the effect of growth form on the functional trait levels and scaling relationships of bryophytes. It also suggests that bryophytes could be good models for investigating the carbon economy and nutrient allocation of plants at the shoot rather than the leaf scale. Keywords Growth form Life form Light interception Nutrient distribution Photosynthetic performance