摘要
为研究缙云山三种典型阔叶树光合生理特性,并找出合适的光响应拟合曲线,通过测定自然条件下三种典型树种四川山矾(Symplocos setchuanensis)、四川大头茶(Gordonia acuminata)、白毛新木姜子(Neolitsea aurata)光合生理生态特征参数,采用修正直角双曲线模型、非直角双曲线模型对光响应曲线进行拟合,结果表明:(1)四川大头茶的光饱和点为1 048μmol/(m2·s),光补偿点为3.25μmol/(m2·s),四川山矾光饱和点为2 337μmol/(m2·s),光补偿点为5.48μmol/(m2·s),白毛新木姜子光饱和点为1 164μmol/(m2·s),光补偿点为4.62μmol/(m2·s);(2)蒸腾速率表现为白毛新木姜子>四川大头茶>四川山矾,在相同光强下,白毛新木姜子比四川山矾蒸腾速率高0.6～0.7μmolCO2/(m2·s)。四川山矾的耐光性最强,且可能为C4植物;对于有光抑制现象树种,修正直角双曲线模型在求光饱和点、最大净光合速率方面更具优势。
For the study of photosynthetic physiological characteristics of the three typical broad-leaved trees in Jinyun Mountain,and identification of the appropriate light response curve,the indicators of the typical tree species（including Symplocos setchuanensis,Gordonia acuminate and Neolitsea aurata） were measured under natural conditions using Li—6400 portable photosynthesis monitor,such as photosynthetic rate,transpiration rate and water use efficiency.Using revised rectangular hyperbolic model（RRHM） and non-rectangular hyperbolic model（NRHM） for light-response curve fitting,we obtained：（1） light saturation point and light compensation point of Gordonia acuminate were 1 048 μmol/（m2·s） and 3.25 μmol/（m2·s）,respectively,while Symplocos setchuanensis′s light saturation point and light compensation point were 2 337 μmol/（m2·s） and 5.48 μmol/（m2·s）,and Neolitsea aurata′s were 1 164 μmol/（m2·s） and 4.62 μmol/（m2·s） respectively;（2） the transpiration rate manifested as Neolitsea aurataGordonia acuminataSymplocos setchuanensis with the transpiration rate of Neolitsea aurata was 0.6~0.7 μmolCO2/（m2·s） higher than that of Symplocos setchuanensis.The results showed that：（1） Symplocos setchuanensis had the strongest light fastness and may be C4 plant;（2） RRHM possessed more advantages in calculating light saturation point and maximum net photosynthetic rate of tree species with photo inhibition.
出处
《水土保持研究》
CSCD
北大核心
2012年第2期189-194,200,共7页
Research of Soil and Water Conservation
基金
林业公益性行业科研专项"西南长江三峡地区典型森林植被对水资源形成过程的调控研究"(201104005-01)
中央高校基本科研业务费专项资金资助(YX2011-26)
长江三峡库区(重庆)森林生态站
关键词
蒸腾速率
水分利用效率
净光合速率
光响应曲线
transpiration rate
water use efficiency
net photosynthetic rate
light response curve
