摘要
利用LI-6400便携式光合作用仪和CI-110冠层分析仪,测定了濒危植物南方红豆杉雌雄植株阴阳面不同部位净光合速率(Pn)与冠层结构参数,以揭示南方红豆杉的净光合速率(Pn)日变化与冠层结构之间的关系。结果表明:南方红豆杉的Pn在10:00时最大,为10.58μmol·m-2·s-1(雌株)和8.21μmol·m-2·s-1(雄株),在14:00时最小,为1.03μmol·m-2·s-1(雌株)和1.54μmol·m-2·s-1(雄株);雌雄植株的Pn日变化(t=0.230,P=0.827)差异不显著(P>0.05);雌雄植株Pn的日变化曲线为"双峰"型,且有明显的"光合午休"现象;在阳面,南方红豆杉冠层各部位的Pn从大到小依次为,雌株为上外>上内>中内>下外>中外>下内;雄株为中外>下外>上外>上内>中内>下内;在阴面,南方红豆杉冠层各部位的Pn从大到小依次为,雌株为上外>上内>中外>中内>下内>下外;雄株为上外>中外>下外>中内>上内>下内;阴阳面雌株冠层各部位(t=1.233,P=0.272)和雄株冠层各部位(t=1.265,P=0.253)的Pn日变化差异均不显著(P>0.05);南方红豆杉雌雄植株的Pn与叶面积指数(LAI)呈极显著负相关(r=-0.732,P=0.000),与叶倾角(MTA)(r=0.602,P=0.001)和散辐射透过系数(τd)(r=0.659,P=0.000)均呈极显著正相关。
To investigate the relationship between diurnal variation of net photosynthetic rate and canopy structure, we measured net photosynthetic rate （Pn） and canopy structure parameters ／[leaf area index （LAI）, mean leaf inclination （MTA）, and radiation coefficient （τd）／] ofendangered plantTaxus chinensis var.mairei by Li-6400 Portable Photosynthesis System and CI-110 Canopy Analyzer. The results showed that Pn was the highest at 10：00, being 10.58 μmol·m-2·s-1 （female） and 8.21 μmol·m-2·s-1 （male） respectively. It was the lowest at 14：00, being 1.03 μmol·m-2·s-1 （female） and 1.54 μmol·m-2·s-1 （female） respectively. Thediurnal variations ofPn was not significantly different between male and female （P〉0.05）. The diurnal variation of Pn in both male and female had a bimodal pattern, with a clear middaydepression. Pn differed among canopy positions. In sunny side, Pn of female was descended inorder of： distal part of upper layer〉basal part of upper layer〉basal part of middle layer〉distal part of lower layer〉distal part of middle layer〉basal part of lower layer. For males,Pn followed the order： distal part of middle layer〉distal part of lower layer〉distal part of upper layer〉basal part of upper layer〉basal part of middle layer〉basal part of lower layer （male）. In rear side,Pn of female was descended as： distal part of upper layer〉basal part of upper layer〉distal part of middle layer〉basal part of middle layer〉basal part of lower layer〉distal part of lower layer. For males,Pn followed the order： distal part of upper layer〉distal part of middle layer〉distal part of lower layer〉basal part of middle layer〉basal part of upper layer〉basal part of lower layer （male）. The diurnal variations of Pn were not significantly different between sunny side and rear side （P〉0.05）.Pn of both male and female was significantly negatively correlated withLAI （r=-0.732,P=0.000） and positively correlated with MTA （r=0.602, P=0.001） andτd （r=0.659, P=0.000）.
作者
铁军
王霞
刘倍贝
TIE Jun1,2 , WANG Xia3, LIU Bei-bei1,4(1 Department of Biological Sciences and Technology, Changzhi College, Changzhi 046011, Shanxi, China ; 2 Ecological and Environmental Research Institute of Taihang Mountain, Changzhi 046011, Shanxi, China; 3College of Life Science, Shanxi Normal University, Linfen 041004, Shanxi, China; 4 School of Life Sciences, Lanzhou University, Lanzhou 730000, China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2018年第4期967-973,共7页
Chinese Journal of Ecology
基金
山西省自然科学基金项目(2012011034-6和2010011041-2)
山西省高等学校大学生创新创业训练项目(2014427)
山西省重点扶持学科项目
长治学院博士启动基金项目资助
关键词
冠层结构
净光合速率
日变化规律
南方红豆杉
濒危植物
canopy structure
photosynthetic rate
diurnal variation
Taxus chinensis var.mairei
endangered plant.
作者简介
通讯作者铁军，男，1974年生，博士，教授，主要事从植物生态学和保护生物学研究。E-mail：tiejun74@163．com
