%0 Journal Article
%T Effects of nitrate application on alleviating photosynthesis restriction of Cinnamomum burmannii leaves under elevated CO2 concentration and enhanced temperature<br>供氮和增温对倍增二氧化碳浓度下荫香叶片光合作用的影响
%A SUN Guchou
%A ZHAO Ping
%A RAO Xingquan
%A CAI Xi''''an
%A ZENG Xiaoping
%A <br>孙谷畴
%A 赵平
%A 饶兴权
%A 蔡锡安 曾小平
%J 应用生态学报
%D 2005
%I 
%X In this study, potted C. burmannii saplings were cultured in a top-closed chamber with elevated CO2 (+ CO2, 731 micromol x mol(-1)) and ambient CO2(CO2, 365 micromol x mol(-1)), and at diurnal temperature (day/night) 25/23 degrees C and 32/25 degrees C, respectively. The gas exchange, calculated photosynthesis parameter, Rubisco content, and activated state of Rubisco were examined. The results showed that under + CO2 and at 25/23 degrees C, the mean photosynthetic rate (Pnsat) of sapling leaves was 5.1% higher than that under + CO2 and at 32/25 degrees C. Temperature enhancement declined Pnsat, while nitrate addition increased it. Under + CO2, saplings had lower V(cmax) and J(max) at 32/25 degrees C than at 25/23 degrees C. Temperature enhancement under + CO2 also declined V(cmax) and J(max). Under + CO2, lower photorespiration rate (Rp) occurred in leaves, but temperature enhancement could increase Rp. Under + CO2, Rubisco content (NR) and its active site per unit leaf area (M) decreased as diurnal temperature changed from 25/23 degrees C to 32/25 degrees C. Meanwhile, nitrate addition could increase NR and M. It may be suggested that nitrate addition could alleviate the restriction of photosynthesis under elevated CO2 concentration and enhanced temperature.
%K Cinnamomum burmannii
%K Restriction of photosynthesis
%K Elevated temperature
%K Elevated CO2concentration<br>荫香
%K 光合作用的限制
%K 温度增高
%K CO2浓度增高
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=71E511B93F573B3F&yid=2DD7160C83D0ACED&vid=7801E6FC5AE9020C&iid=5D311CA918CA9A03&sid=969830E7B1842E81&eid=615D9FEA4E7369ED&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=9&reference_num=36