水稻叶片光合作用对开放式空气CO2浓度增高(FACE)的响应与适应

摘要/Abstract

摘要： 利用便携式光合气体分析系统(LI-6400),比较测定了高CO₂浓度(FACE,free-airCO₂enrichment)和普通空气CO₂浓度下生长的水稻叶片的净光合速率、水分利用率、表观量子效率和RuBP羧化效率等光合参数.在各自生长CO₂浓度(380vs580μmol·mol^-1)下测定时,高CO₂浓度(580μmol·mol^-1)下生长的水稻叶片的净光合速率、碳同化的表观量子效率和水分利用率明显高于普通空气(380μmol·mol^-1)下生长的水稻叶片.但是,随着FACE处理时间的延长,高CO₂浓度对净光合速率的促进作用逐渐减小.在相同CO₂浓度下测定时,FACE条件下生长的水稻叶片净光合速率和羧化效率明显比普通空气下生长的对照低.尽管高CO₂浓度下生长的水稻叶片的气孔导度明显低于普通空气中生长的水稻叶片,但两者胞间CO₂浓度差异不显著,因此高CO₂浓度下生长的水稻叶片光合下调似乎不是由气孔导度降低造成的.

关键词: CO₂浓度增高, 净光合速率, 气孔导度, 水稻, 适应

Abstract: The net photosynthetic rate (Pn),water use efficiency (WUE),and apparent quantum yield of carbon assimilation of rice leaves were boserved contrastively under ambient air (380μmol·mol^-1 CO₂) and FACE (580μmol·mol^-1 CO₂).The results showed that the observed index under FACEwere significantly higher than those under ambient air.Nevertheless,along with the time of high CO₂ treatment prolonged, the enhancement effect of high CO₂ on net photosynthetic rate declined gradually.At the same CO₂ concentration, Pn and carboxylation efficiency (CE) in rice leaves under FACEwere lower than those under ambient air.Although the stomatal conductances in FACE leaves was obviously lower than that in ambient leaves, their intercellular CO₂ concentrations were not significantly different,which implied that the photosynthetic down regulation in rice leaves grown under FACE was not caused by the decrease of stomatal conductance.

中图分类号:

Q945.11

廖轶, 陈根云, 张海波, 蔡时青, 朱建国, 韩勇, 刘钢, 许大全. 水稻叶片光合作用对开放式空气CO₂浓度增高(FACE)的响应与适应[J]. 应用生态学报, 2002, (10): 1205-1209.

LIAO Yi, CHEN Genyun, ZHANG Haibo, CAI Shiqing, ZHU Jianguo, HAN Yong, LIU Gang, XU Daquan . [J]. Chinese Journal of Applied Ecology, 2002, (10): 1205-1209.

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水稻叶片光合作用对开放式空气CO₂浓度增高(FACE)的响应与适应

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