Global Change Research Institute, Academy of Sciences of the Czech Republic, v. v. i., Bělidla 98/4a, Brno, CZ-603 00, Czech Republic.
Faculty of Agriculture, University of South Bohemia, Studentská 1668, CZ-370 05, České Budějovice, Czech Republic.
Sci Rep. 2021 Feb 12;11(1):3723. doi: 10.1038/s41598-021-82382-2.
The study estimates the parameters of the photosynthesis-irradiance relationship (P/I) of a sedge-grass marsh (Czech Republic, Europe), represented as an active "green" surface-a hypothetical "big-leaf". Photosynthetic parameters of the "big-leaf" are based on in situ measurements of the leaf P/I curves of the dominant plant species. The non-rectangular hyperbola was selected as the best model for fitting the P/I relationships. The plant species had different parameters of this relationship. The highest light-saturated rate of photosynthesis (A) was recorded for Glyceria maxima and Acorus calamus followed by Carex acuta and Phalaris arundinacea. The lowest A was recorded for Calamagrostis canescens. The parameters of the P/I relationship were calculated also for different growth periods. The highest A was calculated for the spring period followed by the summer and autumn periods. The effect of the species composition of the local plant community on the photosynthetic parameters of the "big-leaf" was addressed by introducing both real (recorded) and hypothetical species compositions corresponding to "wet" and "dry" hydrological conditions. We can conclude that the species composition (or diversity) is essential for reaching a high A of the "big-leaf "representing the sedge-grass marsh in different growth periods.
该研究估算了一种莎草-草甸湿地（捷克共和国，欧洲）的光合作用-光照关系（P/I）参数，该湿地被表示为一个活跃的“绿色”表面——一个假设的“大叶片”。“大叶片”的光合作用参数基于优势植物物种的原位叶片 P/I 曲线测量。非矩形双曲线被选为拟合 P/I 关系的最佳模型。该植物物种具有不同的关系参数。最大光饱和光合作用速率（A）记录为大油莎草和菖蒲，其次是粗喙薹草和菵草。Calamagrostis canescens 的 A 最低。还为不同的生长时期计算了 P/I 关系的参数。春季的 A 最高，其次是夏季和秋季。通过引入对应于“湿”和“干”水文学条件的实际（记录）和假设的物种组成，研究了当地植物群落的物种组成对“大叶片”光合作用参数的影响。我们可以得出结论，物种组成（或多样性）对于达到代表不同生长时期的莎草-草甸湿地的高 A 是必不可少的。
