生态学报2018，Vol.38Issue(6)：1897-1907,11.DOI:10.5846/stxb201701230187
不同天气水稻光合日变化对大气CO2浓度和温度升高的响应——FACE研究
Response of diurnal variation in photosynthesis to elevated atmospheric CO2 concentration and temperature of rice between cloudy and sunny days： a free air CO2enrichment study
摘要
Abstract
To understand the effect of elevated CO2 concentration,temperature,and different weather of photosynthetically active radiation (PAR) on diurnal variation photosynthetic characteristics of rice,a paddy field experiment utilizing free air CO2 enrichment (FACE) technology was conducted at two concentration levels of CO2(ambient and elevated 200μmol/mol) and two temperature regimes (ambient and elevated 1-2°C) between cloudy and sunny days,using the widely cultivated inbred Japonica rice (Oryza sativa L.) Nanjing 9108 as the test material.Diurnal variation in the photosynthetic characteristics of rice were measured every hour from 9:00 to 17:00 in the two kinds of weather.The diurnal variations in net photosynthetic rate (Pn) under each treatment followed a single-peak curve during cloudy days without a midday depression in photosynthesis,and a double-peak curve during sunny days with a midday depression.The results showed that elevated atmospheric CO2 concentrations significantly increased rice Pn.However,elevated temperature tended to reduce Pn.Therefore,elevating atmospheric CO2 concentration by 200μmol/mol had a greater effect on the photosynthetic characteristics of rice than elevating temperature by 1-2°C.Elevated CO2 concentration improved rice intercellular CO2 concentration (Ci) and inhibited transpiration rate (Tr) by an average 10.8％-22.0％.Elevated temperature nonsignificantly decreased Ci and increased Tr by an average 5.0％-13.5％.Rice Tr on sunny days was larger than on cloudy days,by an average of 9.8％-31.2％.Rice stomatal conductance (Gs) decreased significantly under elevated CO2 concentrations and temperature.This indicated that CO2 concentration,temperature,and PAR had a comprehensive effect on rice water use efficiency (WUE).The PAR on cloudy days was 53.3％ lower than on sunny days.At the same time,the average Pn on cloudy days was lower by an average of 37.1％-72.0％ than that on sunny days.Compared with ambient conditions,Pn increased under elevated CO2 concentrations average by 21.6％-38.8％ and 38.6％-58.4％ in the low PAR of cloudy days and in the high PAR of sunny days,respectively.It is suggested that more attention should be focused on the effect of elevated CO2 concentration,elevated temperature,and the downward trend of PAR on rice,which would be conducive to a more comprehensive assessment of climate change impacts on rice production.关键词
CO2/温度/光合有效辐射/光合日变化/水稻Key words
CO2/temperature/photosynthetically active radiation/diurnal variation photosynthesis/rice引用本文复制引用
袁嫚嫚,朱建国,刘钢,王伟露..不同天气水稻光合日变化对大气CO2浓度和温度升高的响应——FACE研究[J].生态学报,2018,38(6):1897-1907,11.基金项目
基金委国际(地区)合作与交流项目(31261140364) （地区）
科技部国际合作与交流项目(2010DFA22770) （2010DFA22770）
