LIU Min,FANG Jiang-ping.Response of Quercus aquifoliodes Net Photosynthetic Rate to Environmental Factors in Tibet[J].Research of Soil and Water Conservation,2008,15(03):263-265.
西藏川滇高山栎净光合速率对环境因子的响应
- Title:
- Response of Quercus aquifoliodes Net Photosynthetic Rate to Environmental Factors in Tibet
- Keywords:
- Quercus aquifoliodes; net photosynthetic rate; daily change; air temperature; strength of illumination
- 分类号:
- Q945.11;X171
- 摘要:
- 使用便携式光合系统仪LI-6400测定西藏川滇高山栎净光合速率的日变化及其对环境因子的响应。结果表明：川滇高山栎的净光合速率在11：00点左右达到最大值，然后逐渐下降，到20：00左右净光合速率降到0以下，转入暗呼吸。从川滇高山栎的日进程可以看出，叶片出现明显的“午睡”现象。在温度（15.5±2）℃，大气CO2浓度386.5 μmol/mol和相对湿度48%±5%的条件下，光补偿点为22 μmol/（m2·s）左右，光饱和点在1 029 μmol/（m2·s）左右。在大气CO2浓度为381.5 μmol/mol，相对湿度为48%±5%，光强800 μmol/（m2·s）的情况下，15~30℃川滇高山栎的净光合速率都是比较高的。
- Abstract:
- The daily chang of net photosynthetic rate (NPR) and its response to environment factors such as quantum radiation,relative humidity and CO2 concentration of Quercus aquifoliodes was monitored with a portable photosynthesis system.It is showed that the maximal NPR happened at 11:00,then the rate decreased and down below zero at about 20:00 in which Quercus aquifoliodes entered dark respiration.From the Quercus aquifoliodes date advancement,the leaf blade has obvious the phenomenon.Under the condition of air temperature (15.5±2)℃,relative humidity 48%±5%,and CO2 concentration 386.5 μmol/mol,the light compensation point of Quercus aquifoliodes is about 22 μmol/(m2·s) and its light saturation point is about 1 029 μmol/(m2·s).Under the condition of relative humidity 48%±5%,and CO2 concentration 381.5 μmol/mol and saturated luminous intensity 800 μmol/(m2·s),net photosynthetic rate of Quercus aquifoliodes is high at 15~30℃.
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备注/Memo
收稿日期:2007-11-23。
基金项目:“十一五”国家科技支撑计划（2006BAC01A04）
作者简介:刘敏（1981- ），女，河南濮阳人，在读硕士，主要从事生理生态学研究。E-mail：1204abc@163.com
通讯作者:方江平（1967- ），男，副教授，硕士生导师，在读博士，主要从事生态系统的生态学研究。E-mail：xzfjp@sina.com