%0 Journal Article
%T Physiology and ecology of Pometia tomentosa photosynthesis in tropical seasonal rain forest<br>热带季节雨林冠层树种绒毛番龙眼的光合生理生态特性
%A SONG Qinghai
%A ZHANG Yiping
%A ZHENG Zheng
%A YU Guirui
%A SUN Xiaomin
%A <br>宋清海
%A 张一平
%A 郑征
%A 于贵瑞
%A 孙晓敏
%J 应用生态学报
%D 2006
%I 
%X Pometia tomentosa is a dominant uppermost canopy tree in Xishuangbanna tropical seasonal rain forest. In this paper, the photosynthetic characteristics of the three layers of P. tomentosa canopy were measured with Li-6400 portable photosynthesis system, and the results showed that P. tomentosa had the characteristics of high light saturation point (1 000 - 1 500 micromol x m(-2) x s(-1)) and low compensation point (7.7 - 15.3 micromol x m(-2) x s(-1)). Its leaf photosynthesis had the adaptive responses when the high irradiance changed. PAR was the main factor affecting the diurnal changes of net photosynthesis. In December, the leaf grew well, and had a high ability of photosynthesis, with the diurnal change of P. for upper layer exhibiting single-peaked pattern and the maximum value being 8.9 micromol CO2 x m(-2) x s(-1). April was the alternative period of old and young leaves, and the ability of photosynthesis was dropped, with the diurnal change of P(n) for upper layer following double-peaked curve and the maximum value being 4.3 micromol CO2 x m(-2) x s(-1). The highest net photosynthesis rate was observed in July, with the diurnal change of P. for upper and middle layers exhibiting single-peaked pattern and that for lower layers being double-peaked. Short-term enriched CO2 concentration could evidently increase the photosynthesis of P. tomentosa, while the stomatic conductance and transpiration would be inhibited. When the CO, concentration increased from 400 micromol x mol(-1) to 800 micromol x mol(-1), water use efficiency (WUE) was increased by 50% - 100% in dry season, but rather low in wet season.
%K Pometia tomentosa
%K Photosynthesis-light response
%K CO2 response
%K Diurnal change of photosynthetic rate
%K Xishuanghanna<br>绒毛番龙眼
%K 光合光响应
%K CO2响应
%K 光合速率日变化
%K 西双版纳
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=768257BB9715C07E&yid=37904DC365DD7266&vid=BCA2697F357F2001&iid=B31275AF3241DB2D&sid=6D947E6CDDEFFBDE&eid=7EEA6F8DDD9FAD6E&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=13&reference_num=22