文献类型：期刊文献

中文题名：遮荫对江南油杉幼苗生长和叶绿素荧光参数的影响

英文题名：Effects of Shading on Growth and Chlorophyll Fluorescence Characteristics of Keteleeria fortunei var.cyclolepis Seedlings

作者：张培[1,2] 庞圣江[1] 刘士玲[1,3] 谌红辉[1] 段润梅[1] 曾琪瑶[1]

第一作者：张培

机构：[1]中国林业科学研究院热带林业实验中心,广西凭祥532600;[2]广西友谊关森林生态系统国家定位观测研究站,广西凭祥532600;[3]崇左凭祥友谊关森林生态系统广西野外科学观测研究站,广西凭祥532600

年份：2023

卷号：43

期号：10

起止页码：1716-1722

中文期刊名：西北植物学报

外文期刊名：Acta Botanica Boreali-Occidentalia Sinica

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD2023_2024】；

基金：国家林木种质资源共享服务平台项目(2005DKA21003)。

语种：中文

中文关键词：江南油杉;遮荫;幼苗生长;叶绿素荧光特性

外文关键词：Keteleeria fortunei var.cyclolepis;shading;seedling growth;chlorophyll fluorescence characteristics

分类号：S758.1

摘要：为探究有利于江南油杉(Keteleeria fortunei var.cyclolepis)幼苗生长发育的最适光照条件,该研究以1.5年生江南油杉幼苗为研究对象,对其进行为期2年不同光照强度(即全光照和遮荫率40%、60%、80%)处理,分析其形态生长、叶绿素含量、叶绿素荧光参数、生物量积累及分配等对不同光环境的适应机制。结果表明:(1)随遮荫程度的增强,江南油杉幼苗的地径生长量、叶片厚度逐渐减小,株高生长量、叶面积和比叶面积逐渐增大,叶片干质量呈先升后降的趋势;(2)遮荫造成叶片的叶绿素含量、初始荧光(F_(o))、PSⅡ潜在活性(F_(v)/F_(o))、PSⅡ最大光化学量子产量(F_(v)/F_(m))、PSⅡ实际光化学量子产量[Y(Ⅱ)]、电子传递速率(ETR)均呈现显著增加的趋势;(3)遮荫处理下幼苗的叶、茎、根生物量和总生物量总体表现出随着光照强度的降低而减小的变化趋势,幼苗根生物量比和根冠比均减小,而叶生物量比、茎生物量比以及光合组织与非光合组织生物量比均增大。研究发现,全光照下江南油杉幼苗生长发育受到了抑制,遮荫显著影响江南油杉苗期生长及叶绿素荧光特性,适度遮荫能提高幼苗叶片的光捕获能力、光能利用效率,增强幼苗光合能力,促进生长;江南油杉幼苗在遮荫率为60%的环境下受光胁迫较小,其生长、叶片表观特征、光合能力以及生物量积累与分配等表现最优。
In order to explore the optimal light conditions for the growth and development of Keteleeria fortunei var.cyclolepis seedlings,we treated 1.5-year-old K.fortunei var.cyclolepis seedlings with different light intensities(full light,shading rate 40%,60%and 80%)for 2 years,and analyzed their morphological growth,chlorophyll content,chlorophyll fluorescence parameters,biomass accumulation and distribution.The results showed that,(1)with the increase of shading,the growth of ground diameter and the thickness of leaves decreased,the growth of plant height,the leaf area and specific leaf area increased,the dry weight of the leaves increased first and then decreased.(2)The chlorophyll content,the initial fluorescence(F_(o)),the potential activity of PSⅡ(F_(v)/F_(o)),the maximum photochemical quantum yield of PSⅡ(F_(v)/F_(m)),the actual photochemical quantum yield of PSⅡ[Y(Ⅱ)],and the electron transfer rate(ETR)of leaves were all significantly increased due to shading.(3)The leaf,stem,root biomass and total biomass of seedlings under shading treatment showed a trend of decreasing with the decrease of light intensity.The root biomass ratio and root shoot ratio of seedlings decreased,while the leaf biomass ratio,stem biomass ratio and photosynthetic and non-photosynthetic tissue biomass ratio increased.The study found that the growth and development of K.fortunei var.cyclolepis seedlings were inhibited under full light,and shading could significantly affect their growth and chlorophyll fluorescence characteristics,moderate shading could improve the light capture ability and light energy utilization efficiency of seedling leaves,enhance the photosynthetic capacity of seedlings and promote growth;the K.fortunei var.cyclolepis seedlings were less stressed under 60%shading rate,and their growth,leaf phenotype characteristics,photosynthetic capacity,biomass accumulation and distribution were the best.