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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
【摘要】 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.
【Abstract】 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 40 μmol·( 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.
【Key words】 ozone(O3); gross primary productivity(GPP); winter wheat; damage effect; eddy-covariance;
- 【文献出处】 环境科学 ,Environmental Science , 编辑部邮箱 ,2019年10期
- 【分类号】S512.11;X515
- 【网络出版时间】2019-05-28 11:13
- 【下载频次】97