Response of leaf dark respiration of winter wheat to changes in CO_2 concentration and temperature  

作　　者：TAN KaiYan ZHOU GuangSheng REN SanXue 

机构地区：[1]Chinese Academy of Meteorological Sciences [2]State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences

出　　处：《Chinese Science Bulletin》2013年第15期1795-1800,共6页

基　　金：supported by the National Natural Science Foundation of China (41075085);the Project of the National Basic Research Program of China (2010CB951303)

摘　　要：Accurate evaluation of dark respiration of plants is important for estimation of the plant carbon budget.The response of leaf dark respiration of winter wheat to changes in CO 2 concentration and temperature was studied,using an open top chamber during 2011-2012,to understand how leaf dark respiration of winter wheat will respond to climate change.The results indicated that leaf dark respiration decreased linearly with increased CO2 concentration.Dark respiration decreased by about 11% under 560 μmol mol-1 CO2 compared with that under 390 μmol mol-1 CO2.Leaf dark respiration showed an exponential relationship with temperature,and the temperature constant(Q10) was close to 2.Moreover,the responses of leaf dark respiration to CO concentration and temperature were independent.A leaf dark respiration model based on CO2 concentration and temperature responses was developed.This model provides a method for estimation of the leaf dark respiration rate of winter wheat under future climate change and guidance for establishment of crop carbon countermeasures.Accurate evaluation of dark respiration of plants is important for estimation of the plant carbon budget. The response of leaf dark respiration of winter wheat to changes in CO2 concentration and temperature was studied, using an open top chamber during 2011-2012, to understand how leaf dark respiration of winter wheat will respond to climate change. The results indicated that leaf dark respiration decreased linearly with increased CO2 concentration. Dark respiration decreased by about 11% under 560 μmol mol-1 CO2 compared with that under 390 μmol mol-1 CO2. Leaf dark respiration showed an exponential relationship with temper- ature, and the temperature constant （Q10） was close to 2. Moreover, the responses of leaf dark respiration to CO2 concentration and temperature were independent. A leaf dark respiration model based on CO2 concentration and temperature responses was devel- oped. This model provides a method for estimation of the leaf dark respiration rate of winter wheat under future climate change and guidance for establishment of crop carbon countermeasures.

关 键 词：二氧化碳浓度 暗呼吸速率 小麦叶片 温度恒定 CO2浓度增加 未来气候变化 模型开发 指数关系 

分 类 号：S512.11[农业科学—作物学]