混交比例对杉木红锥混交林光环境与叶片生理特征的影响  

Effects of mixed ratio on light environment and physiological characteristics of leaves of Cunninghamia lanceolata and Castanopsis hystrix mixed forest

作　　者：黄健 郭晓斌 杨贵云 严松文 马祥庆[1] 吴鹏飞[1] HUANG Jian;GUO Xiaobin;YANG Guiyun;YAN Songwen;MA Xiangqing;WU Pengfei(College of Forestry,Fujian Agriculture and Forestry University/Engineering Research Center of Fujian Provincial University for Sustainable Management of Plantation Forests,Fuzhou,Fujian 350002,China;Fujian Shanghang Baisha Forestry Farm,Shanghang,Fujian 364205,China)

机构地区：[1]福建农林大学林学院/人工林可持续经营福建省高校工程研究中心,福建福州350002 [2]福建省上杭白砂国有林场,福建上杭364205

出　　处：《亚热带农业研究》2024年第4期234-241,共8页Subtropical Agriculture Research

基　　金：福建省林业科技项目“基于不同混交模式冠层光竞争强度的杉木与红锥混交林中龄期生长特性及碳贮量”(2023FKJ09)。

摘　　要：[目的]探究不同混交比例对杉木与红锥混交林林内光环境以及相邻林木叶片生理特征的影响,为杉阔混交林高效培育提供依据。[方法]选择15年生杉木与红锥混交林为研究对象,杉木与红锥的混交比例分别设为1∶1、2∶1和3∶1,以相同林龄的杉木纯林为对照。测定不同林分林内光环境指标及相邻林木叶片叶绿素、非结构性碳水化合物(NSC)含量,并分析光环境指标与林分冠层特征指标及林木生理指标的相关性。[结果]杉木与红锥混交林冠层开度和平均叶倾角均随着混交比例的增大而增大。不同混交比例林分间光环境指标差异显著,且与冠层开度及平均叶倾角呈正相关。红锥叶片叶绿素a、叶绿素b含量与照度及PPFD呈负相关,杉木叶片叶绿素含量与照度及PPFD呈正相关。红锥叶片淀粉含量随着混交比例的增大呈先减小后增大的趋势,可溶性糖含量呈先增大后减小的趋势,NSC含量则逐渐减小;杉木叶片淀粉含量随着混交比例增大而逐渐增大,而可溶性糖、NSC含量则呈逐渐减小的趋势。[结论]对于中龄发育阶段的杉木与红锥混交林,当杉木比例较大时,林分的冠层开度较大,林内光照强度较好。随着杉木所占比例的减小,林内光照强度减弱,红锥通过提高叶片叶绿素含量以增强光资源的捕获能力;而杉木则通过降低叶绿素含量并提高NSC含量以适应弱光环境。[Purpose]The aim of the study is to explore the effects of different mixed ratios on the light environment and the physiological characteristics of adjacent tree leaves of Cunninghamia lanceolata and Castanopsis hystrix mixed forest,and to provide a basis for the efficient cultivation of Cunninghamia lanceolata and broadleaf mixed forest.[Method]The mixed ratios of Cunninghamia lanceolata and Castanopsis hystrix were set as 1∶1,2∶1,3∶1,respectively in 15-year-old mixed forests of Cunninghamia lanceolata and Castanopsis hystrix,and the pure Cunninghamia lanceolata forest of the same age was set as the control.The indexes of light environment characteristics in different forest stands and the concentrations of chlorophyll and non-structural carbohydrate(NSC)in leaves of adjacent trees were measured,and the correlations between light environment characteristics and canopy characteristics as well as physiological characteristics of trees were analyzed.[Result]The canopy openness and average leaf inclination of Cunninghamia lanceolata and Castanopsis hystrix mixed forest increased with the increase of mixed ratio.There were significant differences in the characteristics of light environment between different mixed ratios of mixed forests,and they were positively correlated with canopy openness and average leaf inclination.The concentrations of chlorophyll a and chlorophyll b in the leaves of Castanopsis hystrix were negatively correlated with light intensity and PPFD,while those in the leaves of Cunninghamia lanceolata were positively correlated with light intensity and PPFD.The starch content of Castanopsis hystrix leaves decreased first and then increased with the increase of mixing ratio,while the contents of soluble sugar increased first and then decreased,and the contents of NSC decreased.The starch content of Cunninghamia lanceolata leaves increased gradually with the increase of mixing ratio,while the contents of soluble sugar and NSC decreased gradually.[Conclusion]For the half-mature mixed forest of Cun

关 键 词：混交比例 冠层特征 光环境 非结构性碳水化合物 红锥 杉木 

分 类 号：S725.2[农业科学—林木遗传育种]