冠层下部遮荫和修枝对红锥苗木生长和光合特征的影响  

Effects of Shading and Pruning in Lower Canopy on Growths and Photosynthetic Characteristics of Castanopsis hystrix Seedlings

作　　者：杨康 杨丽萍 韦宇 滕维超[2] 郑威[1] 谭长强[1] Yang Kang;Yang Liping;Wei Yu;Teng Weichao;Zheng Wei;Tan Zhangqiang(Guangxi Forestry Research Institute,Guangxi Castanopsis Hystrix Seed Cultivation Center,Nanning,Guangxi 530002,China;Guangxi University,Nanning,Guangxi 530004,China;Nanning Rural Revitalization Group Co.,Ltd.,Nanning,Guangxi 530021,China)

机构地区：[1]广西壮族自治区林业科学研究院广西红锥良种培育中心,广西南宁530002 [2]广西大学,广西南宁530004 [3]南宁乡村振兴集团有限公司,广西南宁530021

出　　处：《广西林业科学》2024年第2期225-230,共6页Guangxi Forestry Science

基　　金：广西自然科学基金项目(2020GXNSFBA297051);中央引导地方科技发展资金项目(桂科ZY21195049);广西自筹经费林业科技项目(桂林科研[2022ZC]第31号)。

摘　　要：为了解冠层下部枝叶遮荫和修枝对红锥(Castanopsis hystrix)的影响,以2年生红锥苗木为试材,在红锥苗木1/3冠层下部进行遮荫和修枝处理,测定红锥株高、地径、不同器官生物量和光合特征等指标,研究冠层下部遮荫和修枝对红锥苗木生长和光合特征的影响。结果表明,随遮荫度增加,株高和地径均呈先升后降的趋势;冠层上部和下部各部位生物量及总生物量均呈先升后降的趋势;冠层上部和下部叶生物量分配比及冠层上部茎和地上部分生物量分配比均呈先升后降的趋势;冠层下部枝条、茎和地上部分生物量分配比均呈下降趋势;冠层上部枝条和根生物量分配比及根冠比均呈先降后升的趋势;叶片净光合速率、气孔导度、蒸腾速率和水分利用效率均呈先升后降的趋势;胞间二氧化碳浓度呈先降后升的趋势。45%遮荫和修枝处理下,红锥苗木的生长指标、大部分器官生物量及其分配比和光合特征指标均较高,70%和85%遮荫处理下均较低。In order to understand effects of shading and pruning in lower canopy on Castanopsis hystrix,taking 2-year-old C.hystrix seedlings as test materials,different shading and pruning treatments were carried out on 1/3 lower canopy of C.hystrix seedlings,and indexes of plant height,ground diameter,biomass of different organs and photosynthetic characteristics were determined.Effects of shading and pruning in lower canopy on growths and photosynthetic characteristics of C.hystrix seedlings were studied.Results showed that with increase of shading degree,plant height and ground diameter showed trends of firstly increase and then decrease.Biomass of different parts in upper and lower canopies and total biomass showed trends of firstly increase and then decrease.Biomass allocation ratios of leaves in upper and lower canopies,and biomass allocation ratios of stems and above-ground parts in upper canopy showed trends of firstly increase and then decrease.Biomass allocation ratios of branches,stems and above-ground parts in lower canopy showed trends of decrease.Biomass allocation ratios of branches in upper canopy and roots and root to shoot ratio showed trends of firstly decrease and then increase.Net photosynthetic rate,stomatal conductance,transpiration rate and water use efficiency of leaves showed trends of firstly increase and then decrease.Intercellular carbon dioxide concentration showed trend of firstly decrease and then increase.Growth indexes,most of organ biomass and allocation ratios,and photosynthetic characteristics were higher in 45% shading and pruning treatments,and lower in both 70% and 85% shading treatments.

关 键 词：局部遮荫 修枝 冠层下部 生物量 光合特征 红锥 

分 类 号：S792.17[农业科学—林木遗传育种]