Effect of Forest Gap Size on Chlorophyll Fluorescence Parameters of Three Bamboo Species in Sandy Coastal Area
In order to reveal the photosynthetic adaptability of bamboo plants under the forest gaps of different sizes in Casuarina equisetifolia plantation along coastal sandy area,Pseudosasa japonica,Phyllostachys nidularia f.farcata and Bambusa oldhami are taken in Chishan State-owned Protective Forest Farm located in Dongshan,Fujian Province to measure and analyze the changes in chlorophyll fluorescence parameters of three bamboo species,such as PSII actual photochemical quantum yield(Y),photosynthetic electron transport rate(ETR),photochemical quenching coefficient(qP),non-photochemical quenching coefficient(qN),PSII potential activity(Fv/F0)and maximum photochemical efficiency(Fv/Fm),under different canopy environments(large-sized forest gap,medium-sized forest gap and understory).The results show that different canopy environments have a significant impact on the photosynthetic plasticity of bamboo plants,exhibiting inter-species differences.The Fv/Fm of the three bamboo species decreases with the decrease of canopy light intensity.The Y and ETR values of P.japonica are higher in the medium-sized forest gap and understory,while those of P.nidularia are higher in the medium-sized forest gap,and those of B.oldhami are higher in the large-sized and medium-sized forest gaps.In the low light environment under forest,the photosynthetic electron transport and heat dissipation capacity of P.japonica are not significantly weakened,and its Fv/Fm,Y,and ETR values are significantly higher than those of P.nidularia and B.oldhami under forest.The light energy of photosynthetic electron transfer in P.nidularia and B.oldhami is significantly affected in the low light environment under forest.P.japonica exhibits better weak light adaptability,and its photosynthetic efficiency and heat dissipation capacity remain at higher level in canopy environments with different light intensities.However,B.oldhami and P.nidularia have relatively weak adaptability in low light environments under forest.This study provides a theoretical basis for bamboo plant introduction and the development of photosynthetic adaptation strategies for bamboo plants under coastal protective forests.
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