农学学报2026，Vol.16Issue(1)：7-16,10.
半干旱区不同水分条件下春小麦光响应曲线特征及光合模型拟合分析
Characterization of Spring Wheat Light Response Curve and Fitting Analysis of Photosynthetic Model Under Different Moisture Conditions in Semi-arid Areas
摘要
Abstract
To investigate the mechanism of photosynthetic physiological response of spring wheat under different moisture conditions in semi-arid rain-fed agricultural areas and to optimize field management,the present study was carried out with spring wheat'Dingxi No.48'as the research object.Seven treatments were set up with three replications for each treatment,namely:film mulching(FM),irrigated treatment 1(GG1),irrigated treatment 2(GG2),drought treatment 1(GH1),drought treatment 2(GH2),drought treatment 3(GH3),and rain-fed treatment(YY),to measure the light response curves of spring wheat at different periods under the seven treatments.Five models were chosen,namely,the right-angle hyperbola model,the non-right-angle hyperbola model,the leaf drift model,the exponential model and the double exponential model,to fit and compare the light response curves before and after the irrigation of spring wheat.The results were analyzed for accuracy and the optimal model was selected.The results showed that:(1)the light response curve increased rapidly when the photosynthetically active radiation was 0-400 μmol/(m2·s),and slowed down when it was 600-800 μmol/(m2·s),and then stabilized or showed a decreasing trend.The leaf area index of spring wheat decreased after filling,and the photosynthetic capacity weakened,and the magnitude of the maximum net photosynthetic rate at the maturity of each treatment was in the following order:FM,GG1,YY,GH3,GG2,GH2,and GH1.(2)Combining the MAE,RMSE and R2 of the measured and fitted values of the five models shows that the leaf float model has the highest fitting accuracy.The mulching treatment had the best drought tolerance and the widest range of light adaptation when planting spring wheat in the semi-arid rain-fed agricultural region of Northwest China,and the leaf floating model among the five models best matched the actual photosynthetic characteristics of spring wheat.关键词
半干旱区/春小麦/光响应曲线/模型拟合Key words
semi-arid areas/spring wheat/light response curve/model fitting分类
农业科技引用本文复制引用
赵鹏伟,盖艾鸿,王小平,鲁聪聪,柳涛,李莺莺,张涛..半干旱区不同水分条件下春小麦光响应曲线特征及光合模型拟合分析[J].农学学报,2026,16(1):7-16,10.基金项目
国家自然科学基金"融合星地多源数据的作物干旱过程定量监测方法研究"(42075120) （42075120）
甘肃省自然科学基金"基于星地多源数据的农业干旱过程定量监测"(20JR10RA448). （20JR10RA448）
