油茶优良无性系光合日进程及其与环境因子关系的研究

A Study on Daily Photosynthetic Course of Four Improved Clones of Camellia oleifera and Its Influencing Factors

采用Li-6400光合作用测定系统,在自然环境条件下测定4个大别山系列油茶(Camellia oleifera)的光合作用,研究其光合特性与环境因子的关系,为油茶的科学栽培提供理论依据。结果表明:(1)4个油茶Pn日进程都呈单峰型曲线,Pn与Cond、Ci和光强的关系均达到极显著或显著。(2)4个油茶Tr日进程均为单峰型曲线,但它们的Tr峰值出现时间不一致。影响D1和D2 Tr的主要环境因子是光强,影响D3 Tr的主要环境因子是Cond和Vpdl,而影响D4 Tr的主要环境因子是Cond和Ta。(3)4个油茶WUE的日进程总体呈下降趋势,D3和D4较耐旱,而D1和D2耐旱性较弱。Ci对D1的WUE影响最大,其次是Ta;直接影响D2 WUE的最大环境因子是Ta,其次是Ci;光强对D3的WUE直接影响最大,Ta、Vpdl和RH对其WUE直接影响也很大;而Ta是对D4的WUE直接影响最大的环境因子,其次是Ci。

The photosynthesis of four improved clones of Camellia oleifera in Dabie mountain was measured by Li-6400 portable photosynthetic system under natural condition,meanwhile,the relations between Photosynthesis parameters and its influencing factors were studied.This provides a basis for cultivation.The results showed that：（1）the curves of Pn diurnal variation of the four clones were alla single peak.Under consistent condition the relationships between Pn and Cond,Ci,light intensity were very significant or significant.（2）The Tr daily courses of the four clones were also obvious one-peak curve,but the Tr peak value did not appear in the consistent time;the major environmental factor affecting Tr for D1 and D2 was light intensity,the major environmental factors affecting Tr for D3 were Vpdl and Cond,the major environmental factors affecting Tr for D4 were Ta and Cond;（3）WUE daily courses of leaves from different clones all presented a one-peaked curve decreasing at one side,D3 and D4 were more drought-tolerant by contrast.Ci was the largest factor influencing the WUE of D1,followed by Ta;Ta was the largest factor influencing the WUE of D2,followed by Ci;light intensity was the largest factor directly influencing the WUE of D3,followed by Ci;the direct impact of Ta,Vpdl and RH on its WUE were also very great;Ta was the largest factor influencing the WUE of D4,followed by Ci.