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濒危植物南方红豆杉冠层结构对其净光合速率的影响

铁军1,2*,王霞3,刘倍贝1,4   

  1. 1长治学院生物科学与技术系, 山西长治 046011;2太行山生态与环境研究所, 山西长治 046011;3山西师范大学生命科学学院, 山西临汾 041004; 4兰州大学生命科学学院, 甘肃兰州 730000)
  • 出版日期:2018-04-10 发布日期:2018-04-10

Effects of canopy structure on the net photosynthetic rate in endangered plantTaxus chinensisvar.mairei.

TIE Jun1,2*, WANG Xia3, LIU Bei-bei1,4   

  1. (1Department of Biological Sciences and Technology, Changzhi College, Changzhi 046011, Shanxi, China; 2Ecological and Environmental Research Institute of Taihang Mountain, Changzhi 046011, Shanxi, China; 3College of Life Science, Shanxi Normal University, Linfen 041004, Shanxi, China; 4School of Life Sciences, Lanzhou University, Lanzhou 730000, China).
  • Online:2018-04-10 Published:2018-04-10

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10.58 μmol·m-2·s-1(雌株)和8.21 μmol·m-2·s-1(雄株),在14:00时最小,为1.03μmol·m-2·s-1(雌株)和1.54 μmol·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。
 

关键词: 秸秆还田, CH4排放, 水稻, 稳定性氮肥, 产量, N2O排放

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).

Key words: CH4 emission, rice, straw returning, N2O emission, stabilized fertilizer, yield