刘赞,胡立志,杨露,文亮
LIU Zan,HU Lizhi,YANG Lu,WEN Liang

• 1:四川省林业和草原调查规划院
• 2:四川省林业勘察设计研究院

摘要(Abstract)：

采用盆栽试验方法,以树龄2年生的桢楠幼树为材料,将其移植在阔叶林腐殖土(HS)、紫色土(PS)、冲积土(AS)中培育,并于5月、7月、10月测定各幼树的形态指标和光合指标,探讨在3种土壤上桢楠幼树的生长和光合特性的差异。结果表明:(1)培育在HS中的桢楠幼树长势最好,株高和地径的增长量较多,明显高于紫色土和冲积土上的幼树生长量,而后两种幼树形态生长差异不明显;(2)就幼树叶片中的叶绿素a(Chl a)、叶绿素b(Chl b)、类胡萝卜素(Car)含量看,栽培在HS中的幼树叶片中的光合色素含量最高,叶片色素总体含量表现为:HS>PS>AS;(3)幼树净光合速率(P_n)、气孔导度(G_s)和蒸腾速率(T_r)总体表现为:HS>PS>AS;(4)HS中幼树的光饱和点(LSP)、CO_2饱和点(CSP)均高于PS和AS,光补偿点(LCP)、CO_2补偿点(CCP)均低于PS和AS,说明生长在HS中的幼树具有较高的光合效率,能够积累更多的有机物质。研究表明,桢楠幼树生长在阔叶林腐殖土(HS)上效果最好,紫色土(PS)次之,冲击土(AS)较差,实践中,除非特殊需要,应尽量避免在黏重,孔隙度低、通气透水性差的冲积土上栽植。
In order to explore the differences of growth and photosynthetic characteristics of Phoebe zhennan saplings in three types of soil conditions(broad-leaved forest humus soil(HS), purple soil(PS), alluvial soil(AS)), 2-years-old Phoebe zhennan saplings were taken as study material, which were planted in three types of soil conditions and the saplings morphology and photosynthetic indicators were determined in May, July and October. The results showed that:(1) Phoebe zhennan saplings planted in HS had the best growth, with more growth in plant height and ground diameter,which was obviously higher than that in PS and AS, but there was no obvious difference in morphological growth between the latter two saplings;(2) The saplings planted in HS had the highest levels of chlorophyll a(Chl a),chlorophyll b(Chl b) and carotenoids(Car) content, and the overall leaf pigment content was HS > PS > AS;(3) The overall performance of net photosynthetic rate(P_n), stomatal conductance(G_s) and transpiration rate(T_r) of saplings was HS > PS > AS;(4) The light saturation point(LSP) and CO_2 saturation point(CSP) of saplings in HS were higher than those of PS and AS, while the light compensation point(LCP) and CO_2 compensation point(CCP) were lower than those of PS and AS, indicating that saplings planted in HS had higher photosynthetic efficiency and could accumulat more organic matter. The research showed that Phoebe zhennan saplings grown best in forest humus soil(HS),followed by purple soil(PS), and alluvial soil(AS) was the worse. In practice, it is necessary to avoid planting on alluvial soil with heavy viscosity, low porosity and poor ventilation, unless there is special need.

关键词(KeyWords)： 桢楠;幼树;土壤;生长;光合生理
Phoebe zhennan;Soil;Grow;Photosynthetic physiology

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 刘赞,胡立志,杨露,文亮
LIU Zan,HU Lizhi,YANG Lu,WEN Liang

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