Leaf nutrient contents and photosynthetic physiological characteristics under Ulmus pumila and Robinia pseudocacia mixed plantation
QIN Juan1,2, SHANGGUAN Zhou-ping2
1. College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China; 2. Institute of Soil and Water Conservation, Northwest A & F University, Yangling 712100, China
Pot experiments were used to study the leaf nutrient status and photosynthetic physiological characteristics under Ulmus pumila and Robinia pseudocacia mixed plantation.The leaf nitrogen(N),leaf phosphorus(P),ratio of N/P and Chlorophyll contents(Chl),photosynthetic gas exchange parameters and Chlorophyll fluorescence parameters were measured under U.pumila monoculture,R.pseudocacia monoculture and U.pumila-R.pseudocacia mixed plantation conditions.The results showed that the leaf N contents under the mixed plantation were higher than those in monocultures,but the changes of leaf P contents of U.pumila or R.pseudocacia were smaller under the two different planting ways.Chl and photosynthetic rates(Pn) of U.pumila were higher than R.pseudocacia under the mixed plantation and they were also higher than in monocultures.The Fv/Fm and Fv/Fo of U.pumila were higher than R.pseudocacia and they were also higher than in monocultures.It showed that the leaf PSⅡ potential activity was improved and light energy conversion efficiency of PSⅡ was increased under the mixed plantation than in monocultures.Two different planting methods had little effect on qp,and the NPQ of R.pseudocacia under the mixed plantation was significantly higher than in monocultures.It indicated that the PSII potential heat dissipation capacity of R.pseudocaciaa was much higher,which might be a kind of protection mechanism protecting the leaf away from light damage.This can effectively avoid the damage of excess light energy to photosynthetic apparatus.
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