Photosynthetic Light-response Curves of Lespedeza davurica under Different Water and Fertilization Conditions
In order to study the photosynthetic and physiological characteristics of Lespedeza davurica from loess hilly-gully region under different water and fertility conditions,the photosynthesis-light response curves (Pn-PAR) were determined under potted conditions with three water regimes (HW(80 ％ ± 5 ％ field capacity,FC),MW(60％±5％FC),LW(40％±5％FC)) and four nutrient treatments(CK,N,P,NP).Results indicated that a rectangular hyperbolic correction model was more appropriate to simulate the PnPAR curves of L.davurica under different water and fertility conditions.Under HW regime,NP application significantly improved the maximum net photosynthetic rate (Pnmax),apparent quantum yield (AQY) and light saturation point (LSP);Phosphorus fertilization or nitrogen and phosphorus application together could enhance photosynthetic capacity under adequate water supply,while P application not only can improve its photosynthesis under water stress,and increase its utilization ability to broader light intensity range.
Nitrogen and phosphorusWater stressRectangular hyperbolic correction modelNon-rectangular hyperbolic modelPhotosynthesis
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万方数据
维普
