不同含水量下尖叶拟船叶藓光合速率对光温的响应及其模型

应用生态学报 ›› 2004, Vol. ›› Issue (3): 391-395.

不同含水量下尖叶拟船叶藓光合速率对光温的响应及其模型

李佑稷, 李菁, 陈军, 黄国文

吉首大学生态研究所, 吉首 416000

收稿日期:2003-05-08 修回日期:2003-11-05 出版日期:2004-03-15
通讯作者: 李菁
基金资助:
国家自然科学基金资助项目(39970082)

Response of Dolichomitriopsis diversiformis photosynthesis rate to light,air temperature and plant water content

LI Youji, LI Jing, CHEN Jun, HUANG Guowen

Ecology Institute, Jishou University, Jishou 416000, China

Received:2003-05-08 Revised:2003-11-05 Online:2004-03-15

摘要/Abstract

摘要： 对不同大气温度、藓体含水量及光照条件下尖叶拟船叶藓光合速率测定研究结果表明,光合速率(Pn)与光照强度(PAR)、大气温度(T_a)及藓体含水量(PWC)之间密切相关,光合速率的光响应曲线为直角双曲线,温度、藓体含水量影响图形的曲度参数,在低含水量、高气温组合和高含水量、低气温组合的藓体高光强下都使光合速率降低.弱光下(PAR<200μmol·s^-1·m^-2),光合速率最大值P_max出现在PWC为50%～80%,但随着T_a的升高而增大.当T_a>25℃,P_max随T_a升高而降低;随着光照强度的增大,P_max出现的PWC水平随之提高.当PAR<200μmol·s^-1·m^-2时,光合速率最大值P_max出现在T_a比较高的范围(20～25℃),并随PWC的升高而增大,当PWC>80%时,P_max随PWC升高而降低;随着光照强度的增大,P_max出现的T_a水平降低.在230<PAR<270μmol·s^-1·m^-2条件下,光合速率对温度和含水量响应的灵敏度最大.Pn的温度和含水量响应图型为马鞍型,且曲面参数随PAR的变动而改变.

Abstract: The net photosynthetic rate (Pn) of Dolichomitriopsis diversiformis(Mitt.) was measured under controlled air temperature (T_a),plant water content (PWC) and irradiance (Photosynthetically Active Radiation,PAR) in laboratory.The results showed that Pn was closely related to PAR,T_a and PWC.The response curve of Pn to PAR was a right angle hyperbola,and the parameters were affected by T_a and PWC.The Pn reduction was great when PWC was low and T_a was high,or when PWC was high and T_a was low.The peak Pn (P_max) was observed underweak light (PAR<200 μmol·s^-1·m^-2) and relatively low (50%～80%) PWC.Under higher T_a,P_max was higher,but decreased when T_a was higher than 25 ℃.The PWC range within which P_max occurred increased in accordance with the increase of PAR.When PAR was lower than 200 μmol·s^-1·m^-2,the T_a range within which P_max occurred was relatively high (20～25 ℃),and P_max increased with the increase of PWC.When PWC was higher than 80%,P_max decreased with the increase of PWC.The T_a range within which P_max occurred decreased in accordance with the increase of PAR.Under moderate light (230<PAR<270 μmol·s^-1·m^-2),the sensitivity of Pn response to T_a and PWC was higher than that under higher or lower light.The Pn response to T_a and PWC was saddle-like,and its parameters were altered according to the variation in PAR.

中图分类号:

Q949.35

李佑稷, 李菁, 陈军, 黄国文. 不同含水量下尖叶拟船叶藓光合速率对光温的响应及其模型[J]. 应用生态学报, 2004, (3): 391-395.

LI Youji, LI Jing, CHEN Jun, HUANG Guowen. Response of Dolichomitriopsis diversiformis photosynthesis rate to light,air temperature and plant water content[J]. Chinese Journal of Applied Ecology, 2004, (3): 391-395.

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