臭氧胁迫下冬小麦物质生产与分配的数值模拟

利用ML9810B型臭氧监测分析仪,测定了浙江嘉兴麦田空气O3浓度,并通过改进的开顶式气室实验确定O3浓度变化对冬小麦叶片光合速率的影响函数.在此基础上,加入O3对叶片生长和穗部光合影响的模拟函数,建立反映O3对冬小麦生长和产量形成影响的作物模型.模型的检验结果表明,该模型较好地反映了O3对冬小麦生长的影响,生物量平均相对误差为10.3%.对冬小麦春后生育期(3—5月)的研究表明,水肥适宜时,由O3影响造成的该地区冬小麦干物质累积总损失量为11.4%,产量损失为17.8%.

A simulation model of ozone stress on photosynthetic production and its allocation of winter wheat

Assessing and predicting the impacts of ozone(O3)concentration on crop production have been drawing great attention in the scientific community.The ambient O3 concentration above the winter wheat field was observed with ML9810B O3 Analyzer in Jiaxing,Zhejiang Province.The impact of O3 on the wheat leaf photosynthesis was measured in open-top chamber.Based on the observed parameters,a numerical model for simulating the impact of O3 on the winter wheat development and yield was established,by added the effects of O3 on ear photosynthesis and leaf area.The results showed that the model properly simulated the impacts of O3 on wheat growth in field.The relative error of predicted biomass was 10.3%.The accumulated loss of photosynthate was 11.4% and yield loss was 17.8% at ambient O3 concentration in the wheat growth period under sufficient moisture and fertilizer supplies.