O3胁迫下冬小麦总初级生产力的损耗模拟

Simulated Ozone Damage on Gross Primary Productivity(GPP) in a Winter Wheat Field

基于涡度相关系统,并引入O3损耗半机制模型,分析了南京地区冬小麦主要生育期总初级生产力(GPP)的变化,并模拟了不同O3含量胁迫条件下冬小麦GPP的损耗.结果表明:①冬小麦GPP随其生育期变化,呈现出'中间时段高,前后期低'的分布趋势,最大值为40μmol·(m2·s)-1;②基于高、低两种O3敏感度效应,150、100和50 n L·L-1组和本研究(CK组)胁迫条件下,冬小麦GPP损耗率分别为:-72%、-36%、-6%、-10%和-13%、-6%、-1%、-2%.损耗评估结果可为我国制定防御O3对作物伤害对策提供科学依据.

An eddy-covariance system combined with a semi-mechanistic model was used to analyze variations in gross primary productivity(GPP)and to simulate the impact of ozone(O3)on GPP under different levels O3 concentrations over a winter wheat field in Nanjing.The results showed that GPP was higher during the middle of the growth period and low during the early and late growth periods,reaching a maximum of 40μmol·(m2·s)-1.Using high and low ozone sensitivity settings,O3-damage in 150,100,50 n L·L-1 and control treatment(CK)reduced GPP by-72%,-36%,-6%,and-10%,and by-13%,-6%,-1%,and-2%,respectively.These results provide a scientific basis for formulating defense strategies for O3 damage to crops.