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生态学杂志 ›› 2003, Vol. ›› Issue (4): 90-92.

• 研究简报 • 上一篇    下一篇

不同氮水平对春小麦光合速率日变化的影响

冯兆忠, 王效科, 段晓男, 冯宗炜   

  1. 中国科学院生态环境研究中心系统生态重点实验室, 北京, 100085
  • 收稿日期:2002-04-28 修回日期:2002-11-02 出版日期:2003-04-10
  • 通讯作者: 王效科
  • 基金资助:
    国家自然科学基金资助(30070149)

Effect of nitrogen fertilization on diurnal changes of flag leaf photosynthetic rate in spring wheat

FENG Zhaozhong, WANG Xiaoke, DUAN Xiaonan, FENG Zongwei   

  1. Key Laboratory of System Ecology, Research Center for Eco environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
  • Received:2002-04-28 Revised:2002-11-02 Online:2003-04-10

摘要: 选择干热的天气,测定了春小麦永粮 4号灌浆初期不同氮素营养条件下旗叶的光合速率日变化及其影响因子。利用相关分析和通径分析,考察了光强、叶温、蒸腾速率、气孔导度和细胞间CO2 浓度对光合速率的影响。结果表明,低、高氮处理的旗叶都出现光合“午休”现象,低氮处理光合速率(Pn)日变化为典型的双峰曲线,峰值出现在 10∶00和 14∶00 ;而高氮为单峰曲线,峰值在 10∶00。数据统计分析结果表明,低氮光合“午休”主要受气孔限制,高氮则受气孔与非气孔因素协同作用。高氮增强了开花 灌浆中期春小麦对强光和高温的适应性

关键词: 杉木, 连栽障碍, 土壤微生物, PCR-DGGE, 生物多样性

Abstract: Under field conditions, the spring wheat(Yongliang-4)growing at different nitrogen levels was used to determine diurnal changes of flag leaf photosynthetic rate(Pn)and its major affecting factors. The relationship between photosynthetic rate and its factors were analyzed with correlation analysis and path analysis. The results indicated that the Pn of both nitrogen levels showed midday depression phenomenon. The Pn at low nitrogen level(60 kg ·hm-2)varied as a two peaked curve: at 10∶00 and 14∶00. But high nitrogen level(225 kg ·hm-2)varied as a single peaked curve at 10∶00. Statistical analysis results showed that the photosynthetic depression of flag leaf growing at low nitrogen level was mainly controlled by the stomatal factor.But at high nitrogen level, it was mutually controlled by stomatal and non-stomatal factors. High nitrogen enhances adaptation of spring wheat to strong radiation and high temperature at early filling stage.

Key words: Chinese fir, Continuous planting, Soil microbes, PCR-DGGE, Biodiversity

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