干旱地区农业研究2018，Vol.36Issue(1)：10-18,9.DOI:10.7606/j.issn.1000-7601.2018.01.02
干热河谷紫色土区不同复合肥施肥量对玉米苗期光响应特性的影响
Light response characteristics of maize seedling under different amount of compound fertilizer in the purple soil at dry-hot valley
摘要
Abstract
In this study,three different light response models were used to simulate the effect of different compound fertilizers on the light response characteristics of maize at seedling stage.The optimal model was selected though compar-ing the advantages and disadvantages of different fitting models.This study could provide a scientific basis for the the re-search of nitrogen,phosphorus and potassium physiology and scientific fertilization of spring maize in the purple soil area by using the optimal model to simulatie the maize photosynthetic parameters.On the basis of plot fertilization test,the photosynthesis of a maize(cultivar,Changcheng799)leaves at the seedling stage was measured by LI -6400 portable photosynthesis system.The photosynthetic response characteristics of maize seedling leaves under different levels of com-pound fertilizition treatments were studied,and three different light response models,including rectangular hyperbola model,non-rectangular hyperbola model and modified model of rectangular hyperbola were used to selected the optimal model by comparing the fitting degree(R2),apparent quantum efficiency(α),maximum net photosynthetic rate (Pnmax),light saturation point(LSP),light compensation point(Ic)and dark respiration rate(Rd).(1)The three kinds of the models can be well applied to fitting the maize leaf Pn light response of different compound fertilizer treat-ments,and the determination coefficient of the three different models were all greater than 0.98.The determination coef-ficients in order are:the rectangular hyperbola modified model>the non-rectangular hyperbola model>the rectangular hyperbola model.(2)The four parameters of maximum net photosynthetic rate(Pnmax),light saturation point(LSP), light compensation point(Ic)and dark respiration rate(Rd)are close to the measured values by the right angle hyperbol-ic model.(3)The net photosynthetic rate,intercellular CO2concentration,stomatal conductance and transpiration rate of maize on seedlings stage increased with the increasing of fertilizer application rate,but decreased by the extreme rate of fertilizer.Reasonable increase of the amount of fertilizer could increase the chlorophyll content of the maize leaves at seedling stage,and prolong the period of higher photosynthetic capacity.The results from the three models simulation show that the modified rectangular hyperbola model can best fit the light response of photosynthesis and accurately calcu-late main photosynthetic parameters,such as the maximum net photosynthetic rate and saturation light intensity.Thus, the modified rectangular hyperbola model can be applied to fit the light response curves of photosynthesis of maize under different compound fertilizers in dry-hot valley purple soil of Yuanmou.Therefore,the fertilization amounts ranged from 1.12 t·hm-2(N,0.190;P2O5,0.190;K2O,0.190 t·hm-2)and 1.49 t·hm-2(N,0.253;P2O5,0.253;K2O, 0.253 t·hm-2)were the tolerable fertilization amounts.关键词
玉米/光合参数/施肥量/直角双曲线模型/非直角双曲线模型/直角双曲线修正模型Key words
maize/photosynthetic parameter/fertilization/rectangular hyperbola model/non-rectangular hyperbola model/modified model of rectangular hyperbola分类
农业科技引用本文复制引用
赵丽,贺玉晓,魏雅丽,刘刚才..干热河谷紫色土区不同复合肥施肥量对玉米苗期光响应特性的影响[J].干旱地区农业研究,2018,36(1):10-18,9.基金项目
国家自然科学基金项目"气候变化对紫色土容许土壤流失量的影响"(41471232) （41471232）
西南科技大学博士基金"不同N、P施肥量对紫色土玉米生长期微生物特性及土壤肥力的影响"(14zx7108) （14zx7108）
河南理工大学博士基金"干热河谷土壤水分胁迫对扭黄茅生理特性的影响机制"(B2014-070) （B2014-070）
