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• 研究报告 •    下一篇

草光合作用日变化及其与环境因子的关系

李萍萍1;陈歆1;付为国2;吴沿友1;吴春笃1   

  1. 1江苏大学江苏省现代农业装备与技术重点实验室, 镇江 212013;2南京农业大学农业与生物技术学院, 南京 210095
  • 收稿日期:2005-12-16 修回日期:2006-06-23 出版日期:2006-10-10 发布日期:2006-10-10

Diurnal change of Phalaris arundinacea photosynthetic characteristics and its relations with environmental factors

LI Pingping1; CHEN Xin1; FU Weiguo2; WU Yanyou1; WU Chundu1   

  1. 1Key Laboratory of Modern Agricultural Equipment and Technology of Jiangsu Province, Jiangsu University, Zhenjiang 212013, China;2College of Agricultural and Biological Technology, Nanjing Agricultural University, Nanjing 210095, China
  • Received:2005-12-16 Revised:2006-06-23 Online:2006-10-10 Published:2006-10-10

摘要: 对镇江北固山湿地优势植物——〓草的光合作用进行了试验研究。结果表明,春夏季晴天〓草净光合速率(Pn)的日变化为双峰曲线,有明显的光合“午休”现象;多云天〓草的Pn主要受光强制约,随光合有效辐射(PAR)变化而变化。经统计学验证,〓草的Pn与PAR、气孔导度(Gs)有显著正相关关系,而与细胞间隙CO2浓度(Ci)呈显著负相关。用一元二次方程拟合了〓草的光响应曲线,得到光补偿点为38.572 μmol·m-2·s-1,光饱和点为2 087.5 μmol·m-2·s-1

关键词: 水稻, 化感作用, 抑草效应, 农艺性状, 品种

Abstract: The study on the photosynthetic characteristics of Phalaris arundinacea, the dominant plant in Beigu Mountain wetland, showed that on sunny days in spring and summer, the net photosynthetic rate (Pn) of P. arundinacea had a diurnal change with two peaks, exhibiting an obviously phenomena of midday depression, while on cloudy days, the Pn was mainly affected by light intensity.The Pn was positively correlated with photosynthetically available radiation (PAR) and stomatal conductance (Gs), while negatively correlated with intercellular CO2 concentration (Ci). The light-response curve of P. arundinacea could be quantitatively simulated by quadratic equation, with the obtained light compensation point being 38.572 μmol·m-2·s-1 and light saturation point being 2 087.5 μmol·m-2·s-1.

Key words: Oryza sativa, Allelopathy, Agronomic character, Weed-inhibiting effect, Variety