Numerical Simulation Study on the Impacts of Tropospheric and CO_2 Concentration Changes on Winter Wheat. Part I: Model Description  

作　　者：郑昌玲 王春乙 

机构地区：[1]National Meteorological Center [2]Chinese Academy of Meteorological Sciences

出　　处：《Acta meteorologica Sinica》2006年第1期109-116,共8页

基　　金：Supported by the key project of the National Natural Science Foundation of China under Grant No. 49899270.

摘　　要：Ozone is well documented as the air pollutant It is reported that tropospheric 03 concentration most damaging to agricultural crops and other plants. increases rapidly in recent 20 years. Evaluating and predicting impacts of ozone concentration changes on crops are drawing great attention in the scientific community. In China, main study method about this filed is controlled experiments, for example, Open Top Chambers. But numerical simulation study about impacts of ozone on crops with crop model was developed slowly, what is more, the study about combined impacts of ozone and carbon dioxide has not been reported. The improved agroecosystem model is presented to evaluate simultaneously impacts of tropospheric O3 and CO2 concentration changes on crops in the paper by integrating algorithms about impacts of ozone on photosynthesis with an existing agroecosystem biogeochemical model （named as DNDC）. The main physiological processes of crop growth （phenology, leaf area index, photosynthesis, respiration, assimilated allocation and so on） in the former DNDC are kept. The algorithms about impacts of ozone on photosynthesis and winter wheat leaf are added in the modified DNDC model in order to reveal impacts of ozone and carbon dioxide on growth, development, and yield formation of winter wheat by coupling the simulation about impacts of carbon dioxide on photosynthesis of winter wheat which exists in the former DNDC. In the paper, firstly assimilate allocation algorithms and some genetic parameters （such as daily thermal time of every development stage） were modified in order that DNDC can be applicable in North China. Secondly impacts of ozone on crops were simulated with two different methods- one was impacts of ozone on light use efficiency, and the other was direct effects of ozone on leaves photosynthesis. The latter simulated results are closer to experiment measurements through comparing their simulating results. At last the method of direct impacts of ozone on leaf growth is adopted and the coefficiOzone is well documented as the air pollutant It is reported that tropospheric 03 concentration most damaging to agricultural crops and other plants. increases rapidly in recent 20 years. Evaluating and predicting impacts of ozone concentration changes on crops are drawing great attention in the scientific community. In China, main study method about this filed is controlled experiments, for example, Open Top Chambers. But numerical simulation study about impacts of ozone on crops with crop model was developed slowly, what is more, the study about combined impacts of ozone and carbon dioxide has not been reported. The improved agroecosystem model is presented to evaluate simultaneously impacts of tropospheric O3 and CO2 concentration changes on crops in the paper by integrating algorithms about impacts of ozone on photosynthesis with an existing agroecosystem biogeochemical model （named as DNDC）. The main physiological processes of crop growth （phenology, leaf area index, photosynthesis, respiration, assimilated allocation and so on） in the former DNDC are kept. The algorithms about impacts of ozone on photosynthesis and winter wheat leaf are added in the modified DNDC model in order to reveal impacts of ozone and carbon dioxide on growth, development, and yield formation of winter wheat by coupling the simulation about impacts of carbon dioxide on photosynthesis of winter wheat which exists in the former DNDC. In the paper, firstly assimilate allocation algorithms and some genetic parameters （such as daily thermal time of every development stage） were modified in order that DNDC can be applicable in North China. Secondly impacts of ozone on crops were simulated with two different methods- one was impacts of ozone on light use efficiency, and the other was direct effects of ozone on leaves photosynthesis. The latter simulated results are closer to experiment measurements through comparing their simulating results. At last the method of direct impacts of ozone on leaf growth is adopted and the coeffici

关 键 词：OZONE carbon dioxide DNDC model numerical simulation 

分 类 号：S512.11[农业科学—作物学] S16