生态学杂志2018，Vol.37Issue(4)：967-973,7.DOI:10.13292/j.1000-4890.201804.040
濒危植物南方红豆杉冠层结构对其净光合速率的影响
Effects of canopy structure on the net photosynthetic rate in endangered plant Taxus chinensis var.mairei.
摘要
Abstract
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)] of endangered plant Taxus 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.The diurnal variations of Pn 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 midday depression.Pn differed among canopy positions.In sunny side,Pn of female was descended in order 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 with LAI (r=-0.732,P=0.000) and positively correlated with MTA (r=0.602,P=0.001) and τd (r=0.659,P=0.000).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Key words
canopy structure/photosynthetic rate/diurnal variation/Taxus chinensis var.mairei/endangered plant引用本文复制引用
铁军,王霞,刘倍贝..濒危植物南方红豆杉冠层结构对其净光合速率的影响[J].生态学杂志,2018,37(4):967-973,7.基金项目
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和长治学院博士启动基金项目资助. （2012011034-6和2010011041-2）
