南方农业学报2017，Vol.48Issue(11)：1983-1988,6.DOI:10.3969/j.issn.2095-1191.2017.11.09
磷素供给对米槁幼苗光合作用—CO2响应的影响
Effects of phosphorus application on photosynthesis-CO2 response of Cinnamomum migao H. W. Li seedlings
摘要
Abstract
[Objective]This study was conducted to explore the response mechanism of photosynthesis to CO2 in Cin-namomum migao H. W. Li seedlings under different phosphorus levels,in order to provide reference for scientific phospho-rus application and cultivation of C. migao in southwestern China.[Method]This study took half-year C. migao seedlings as experimental material. Four phosphorus(KH2PO4)supply concentrations(CK was 1.000 mmol/L,P1,P2 and P3 were 0.125,0.500 and 2.000 mmol/L respectively)were set. Photosynthetic characteristics of the C. migao seedlings under dif-ferent treatments were determinated,and light response curves and parameters were fitted by using right angle hyperbola model,non-right angle hyperbola model and modified right angle hyperbola model(Pn/Ci).[Result]Determination coeffi-cients R2 of the three fitting models on C. migao seedlings photosynthesis response were above 0.9900,and the effective-ness trend was Pn/Ci model>non-right angle hyperbola model>right angle hyperbola model. Pn/Ci model was the most practical one for photosynthesis-CO2 response of C. migao seedlings,and fitting effectiveness of the model was in line with this trend under different phosphorus levels. Under all phosphorus treatments,except intercellular CO2 concentration (Ci),the rank of net photosynthetic rate(Pn),stomatal conductance(Gs),and transpiration rate(Tr)was CK>P3>P2>P1, and Pn,Gs and Tr under P1 treatment were significantly different from those under other treatments(P<0.05),which showed that the photosynthetic efficiency of C. migao seedlings was the highest under 1.000 mmol/L KH2PO4 treatment.[Conclusion]The Pn/Ci model is the most suitable for photosynthesis-CO2 response fitting of C. migao seedlings. Appropri-ate application of phosphorus can promote C. migao photosynthesis. The most suitable content of phosphorus in soil for C. migao seedlings is 1.000 mmol/L.关键词
米槁幼苗/光合作用/CO2响应/双曲线模型/土壤磷含量Key words
Cinnamomum migao H. W. Li seedlings/photosynthesis/CO2 response/hyperbolic model/soil phos-phorus content分类
农业科技引用本文复制引用
熊雪,刘济明,王军才,柳嘉佳,李佳,邓明明..磷素供给对米槁幼苗光合作用—CO2响应的影响[J].南方农业学报,2017,48(11):1983-1988,6.基金项目
贵州省科技计划项目(黔科合SY字[2015]3023-1) （黔科合SY字[2015]3023-1）
贵州省林业厅重大项目(黔林科合[2010]重大04号) （黔林科合[2010]重大04号）
贵州大学研究生创新基金项目(研农2017012) （研农2017012）
