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旱作条件下紫花苜蓿光合蒸腾日变化与环境因子的关系

刘玉华1,2;史纪安1,2;贾志宽1;韩清芳1   

  1. 1西北农林科技大学农学院, 杨凌 712100; 2河南科技大学农学院, 洛阳 471003
  • 收稿日期:2005-09-14 修回日期:2006-07-28 出版日期:2006-10-18 发布日期:2006-10-18

Diurnal dynamics of photosynthetic and transpiration rates of alfalfa under dry farming and their relationships with environmental factors

LIU Yuhua1,2; SHI Ji’an1,2; JIA Zhikuan1; HAN Qingfang1   

  1. 1College of Agronomy, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China;2College of Agronomy, Henan University of Science and Technology, Luoyang 471003, China
  • Received:2005-09-14 Revised:2006-07-28 Online:2006-10-18 Published:2006-10-18

摘要: 在旱作条件下测定了4年生紫花苜蓿初花期光合蒸腾特性,以及光合有效辐射(PAR)、田间CO2浓度(Ca)、相对湿度(RH)、大气温度(Ta)等环境因子的日变化,并采用相关系数、通径系数和决策系数分析了紫花苜蓿光合蒸腾特性日变化与环境因子的关系.结果表明,对光合速率日变化直接影响最大的因子是Ta,而RH、PAR和Ca主要是通过Ta而间接地影响光合速率日变化;对蒸腾速率日变化直接影响最大的因子是PAR,而RH、Ta和Ca主要是通过PAR而间接地影响蒸腾速率日变化.对光合蒸腾特性起主要决定作用的因子是PAR,主要限制因子是Ta.

关键词: 冬小麦, 干物质, 累积分配, 模拟

Abstract: In this paper, the diurnal dynamics of photosynthetic rate (Pn) and transpiration rate (Tr) of four years planted alfalfa under dry farming, as well as those of photosynthetic active radiation (PAR), CO2 concentration in field (Ca), relative humidity (RH) and air temperature (Ta) were measured , and the relationships between the diurnal dynamics of Pn, Tr and climatic factors were analyzed by correlation coefficient, path coefficient, and decision coefficient analyses. The results showed that Ta had the greatest effect on the diurnal dynamics of Pn, while RH, PAR and Ca affected Pn mainly through their acting on Ta. PAR had the greatest effect on the diurnal changes of Tr, and RH, Ta and Ca affected Tr indirectly by acting on PAR. For the characteristics of photosynthesis and transpiration, PAR was the primary determining factor, and Ta was the main limiting factor.

Key words: Winter wheat, Dry matter, Accumulation and distribution, Simulation