%0 Journal Article
%T Photosynthetic characteristics of Gynostemma pentaphyllum under shade<br>遮荫条件下绞股蓝光合作用特点的研究
%A HUANG Chenglin
%A WU Zemin
%A YAO Yongkang
%A XU Xiaoniu
%A <br>黄成林
%A 吴泽民
%A 姚永康
%A 徐小牛
%J 应用生态学报
%D 2004
%I 
%X The study showed that under summer shade condition, the diurnal variation of net photosynthetic rate of Gynostemma pentaphyllum presented nontypical double apex, the first apex being 13.8 micromol CO2 x m(-2) x s(-1) at 11:00, and the diurnal net photosynthetic rate was about 176.97 micromol CO2 x m(-2), 3.1 times of that under full sunlight. There was a positive correlation between net photosynthetic rate and photon flux density (PFD), and relative humidity had a small effect on net photosynthetic rate. Under full sunlight, the typical "midday depression" of photosynthesis was observed, and the diurnal variation of net photosynthetic rate presented double apex, with the first apex being 3.0 micromol CO2 x m(-2) x s(-1) at 10:00 and the second being 1.25 micromol CO2 x m(-2) x s(-1) at 14:00. There was a positive correlation between net photosynthetic rate and relative humidity, and the latter had a strong effect on net photosynthetic rate. When PFD was higher than 700 micromol CO2 x m(-2) x s(-1), it had a negative correlation with net photosynthetic rate. Stoma conductance was the main factor affecting the transpiration rate of Gynostemma pentaphyllum. Therefore, Gynostemma pentaphyllum was a typical sciophytic plant, and light factor should be considered firstly in its cultivation.
%K Gynostemma pentaphyllum
%K Transpiration rate
%K Stoma conductance
%K Photon flux density
%K Net photosynthetic rate<br>绞股蓝
%K 蒸腾速率
%K 气孔导度
%K 光量子通量密度
%K 净光合速率
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=2B33AB640DDFD986&yid=D0E58B75BFD8E51C&vid=23CCDDCD68FFCC2F&iid=708DD6B15D2464E8&sid=9329D00191B11ACC&eid=44A550A7E1220BE2&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=12&reference_num=24