不同土壤水分条件下栾树光合作用的光响应  

Light response of photosynthesis of Koelreuteria paniculata Laxm.under different soil water conditions

作　　者：陈志成[1] 王荣荣[1] 王志伟[1] 杨吉华[1] 王华田[1] 耿兵[1] 张永涛[1] 

机构地区：[1]山东农业大学林学院山东省土壤侵蚀与生态修复重点实验室,山东泰安271018

出　　处：《中国水土保持科学》2012年第3期105-110,共6页Science of Soil and Water Conservation

基　　金：世界银行贷款山东省生态造林项目“干旱瘠薄山地树种及造林模式选择研究”(SEAP-KY-1)

摘　　要：采用光合作用光响应直角双曲线模型、非直角双曲线模型和直角双曲线修正模型对栾树在不同土壤水分条件下的光响应曲线进行拟合,探讨不同光响应模型对栾树的适用性及栾树光合特性对土壤水分和光照强度的响应规律。结果表明:1)3个模型都能较好地拟合栾树的光合光响应过程,其中直角双曲线修正模型能拟合在光抑制条件下的光响应过程,非直角双曲线模型和直角双曲线修正模型要优于直角双曲线模型;2)栾树对土壤水分和光照强度的适宜范围较广,土壤相对含水量在41.5%～93.3%范围内,净光合速率、表观量子效率均相对较高,光合有效辐射强度在600～2 000μmol/(m2.s)范围内,净光合速率和水分利用效率均能获得较高水平。The light responses of photosynthesis of Koelreuteria paniculata Laxm.were studied under 4 different soil water conditions,and the light response curves of photosynthesis were fitted and analyzed by rectangular hyperbola model,non-rectangular hyperbola model and a modified model based on rectangular hyperbola model.Then the best model for Koelreuteria paniculata Laxm.was selected.Photosynthetic characteristic were studied under different soil water conditions and different light intensity.The results show that： 1） The light response of photosynthesis were well fitted by the three models,and the modified rectangular hyperbola model could well fit light response of photosynthesis of photo-inhibition.Non-rectangular hyperbola model and modified rectangular hyperbola model is better than rectangular hyperbola model.2） Koelreuteria paniculata Laxm.had strong adaptability to soil water and light conditions.Higher photosynthetic rate（Pn） and apparent quantum yield（Φ） were observed in the region where the relative soil water contents（RWC） were from 41.5% to 93.3%.Higher Pn and water use efficiency（WUE） were observed in the region where the photosynthetic active radiation（PAR） were from 600 to 2 000 μmol/（m2·s）.

关 键 词：栾树 土壤水分 光合作用光响应 光响应模型 蒸腾作用 水分利用效率 

分 类 号：S644.2[农业科学—蔬菜学]