摘要
为探索光温协同作用对作物产量影响的机制和规律,文中运用APSIM模型模拟小麦产量对光照和温度变化的响应机制。研究结果表明:当温度不变时,小麦产量随光照升高呈开口向上的二次抛物线型变化,光照降低阈值点为3.23MJ/m2(日平均光照为17.89MJ/m2)。当光照小于17.89MJ/m2,光照对产量为负效应,每增加0.5MJ/m2,最大减产幅度高达7.1%,平均减产4.2%。当光照大于17.89MJ/m2,光照对产量为正效应,每增加0.5MJ/m2,最大增产幅度为2.9%,平均增产1.0%;当光照不变时,小麦产量与温度呈二次抛物线下降型变化,且温度对产量的贡献呈叠加递减效应。温度每升高0.5℃,最大减产幅度高达13.37%,平均减产7.31%。光照和温度二者之间存在正的互作效应,光照升高的增产效应不能补偿高温所导致的减产。
In order to explore the influence mechanism and regulation of the cooperation effect of light and temperature on yields of crops,the response of wheat to light and changed temperature was researched by simulating wheat yield using APSIM model.The results showed that when the temperature was unchanged,wheat yield and light showed an open up type change of quadratic parabola,and threshold point of lower light was 3.23MJ/m2（the daily average light go up to17.89MJ/m2）.When light was less than 17.89 MJ/m2,light on yield showed negative effect,when decreased 0.5MJ / m2,the highest yield decrease range reached 7.1%,with average reduction of 4.2%.When light was greater than 17.89 MJ/m2,light on yield was positive effect,when light increased 0.5MJ/m2 the highest yield improvement range reached 2.9%,with average improvement of 1.0%.When light was constant,wheat yield with temperature showed decrease change with quadratic parabola,and the contribution of temperature to the yield coincided with the superimposed decreasing effect.Light increased 0.5℃,the highest yield decrease range reached 13.37%,with average reduction of 7.31%.There existed an plus interaction effect between them.Increasing yield caused by elevated light can＇t compensate the yield reduction caused by high temperature.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2014年第2期98-102,共5页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(31060178)
甘肃省自然科学基金项目(096RJZA010和1010RJZA185)资助
关键词
APSIM
小麦产量
光温
响应
APSIM
wheat yield
light-temperature
response
