Dataset Information

Photosynthetic parameters of a sedge-grass marsh as a big-leaf: effect of plant species composition.

ABSTRACT: The study estimates the parameters of the photosynthesis-irradiance relationship (P_N/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_N/I curves of the dominant plant species. The non-rectangular hyperbola was selected as the best model for fitting the P_N/I relationships. The plant species had different parameters of this relationship. The highest light-saturated rate of photosynthesis (A_sat) was recorded for Glyceria maxima and Acorus calamus followed by Carex acuta and Phalaris arundinacea. The lowest A_sat was recorded for Calamagrostis canescens. The parameters of the P_N/I relationship were calculated also for different growth periods. The highest A_sat 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_sat of the "big-leaf "representing the sedge-grass marsh in different growth periods.

SUBMITTER: Mejdova M

PROVIDER: S-EPMC7881001 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Photosynthetic parameters of a sedge-grass marsh as a big-leaf: effect of plant species composition.

Mejdová Markéta M Dušek Jiří J Foltýnová Lenka L Macálková Lenka L Čížková Hana H

Scientific reports 20210212 1

The study estimates the parameters of the photosynthesis-irradiance relationship (PN/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 PN/I curves of the dominant plant species. The non-rectangular hyperbola was selected as the best model for fitting the PN/I relationships. The plant species had different ...[more]

PMID: 33580095

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Project description:Soil heterogeneity significantly affects plant dynamics such as plant growth and biomass. Most studies developed soil heterogeneity in two dimensions, i.e. either horizontally or vertically. However, soil heterogeneity in natural ecosystems varies both horizontally and vertically, i.e. in three dimensions. Previous studies on plant biomass and biomass allocation rarely considered the joint effects of soil heterogeneity and species composition. Thus, to investigate such joint effects on plant biomass and biomass allocation, a controlled experiment was conducted, where three levels of soil heterogeneity and seven types of species compositions were applied. Such soil heterogeneity was developed by filling nutrient-rich and nutrient-poor substrates in an alternative pattern in pots with different patch sizes (small, medium or large), and species compositions was achieved by applying three plant species (i.e. Festuca elata, Bromus inermis, Elymus breviaristatus) in all possible combinations (growing either in monoculture or in mixtures). Results showed that patch size significantly impacted plant biomass and biomass allocation, which differed among plant species. Specially, at the pot scale, with increasing patch size, shoot biomass decreased, while root biomass and R:S ratio increased, and total biomass tended to show a unimodal pattern, where the medium patch supported higher total biomass. Moreover, at the substrate scale, more shoot biomass and total biomass were found in nutrient-rich substrate. Furthermore, at the community scale, two of the three target plant species growing in monoculture had more shoot biomass than those growing together with other species. Thus, our results indicate soil heterogeneity significantly affected plant biomass and biomass allocation, which differ among plant species, though more research is needed on the generalization on biomass allocation. We propose that soil heterogeneity should be considered more explicitly in studies with more species in long-term experiments.

Dataset Information

Photosynthetic parameters of a sedge-grass marsh as a big-leaf: effect of plant species composition.

Publications

Photosynthetic parameters of a sedge-grass marsh as a big-leaf: effect of plant species composition.

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