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海南红豆(Ormosia pinnata)夏季叶片气体交换,气孔导度和水分利用效率的日变化
引用本文:赵平,曾小平,彭少麟,孙谷畴.海南红豆(Ormosia pinnata)夏季叶片气体交换,气孔导度和水分利用效率的日变化[J].热带亚热带植物学报,2000,8(1):43-48.
作者姓名:赵平  曾小平  彭少麟  孙谷畴
作者单位:中国科学院华南植物研究所,广东,广州,510650
基金项目:中国科学院"九·五"重大资助项目(KZ951-B1-110),广东省自然科学基金项目(980952)和中国生态研究网络研究项目(KZ95T-04-02,KZ951-A1-301)资助.
摘    要:对野外海南红豆叶片的气体交换、气孔导度和水分利用效率及其相应环境因子的日变化进行测定的结果表明:夏季7月叶片净光光合速率和蒸腾速率的日变化曲线呈双峰型,前者的变化主要受光控制,与气温、叶温和湿度的关系不明显;后者与光、气温和叶温成正相关,与湿度成负相关,气孔导度对湿度的敏感性比对光和温度明显很多。分析结果显示,气孔导度和光合速率受环境因子的响应是相对独立的,海南红豆的水分利用效率最高值出现在上午较

关 键 词:气体交换  净光合速率  气孔导度  日变化  海南红豆
文章编号:1005-3395(2000)01-0035-08
修稿时间:1998年7月10日

DAILY VARIATION OF GAS EXCHANGE,STOMATAL CONDUCTANCE AND WATER USE EFFICIENCY IN SUMMER LEAVES OF ORMOSIA PINNATA
ZHAO Ping,ZENG Xiao-ping,PENG Shao-lin,SUN Gu-chou.DAILY VARIATION OF GAS EXCHANGE,STOMATAL CONDUCTANCE AND WATER USE EFFICIENCY IN SUMMER LEAVES OF ORMOSIA PINNATA[J].Journal of Tropical and Subtropical Botany,2000,8(1):43-48.
Authors:ZHAO Ping  ZENG Xiao-ping  PENG Shao-lin  SUN Gu-chou
Abstract:Daily gas exchange, stomatal conductance and water use efficiency in summer leaves of 6-8 years old Ormosia pinnata were undertaken in a mixed forest of Heshan Hilly Land Interdisplinary Experiment Station in 1995. Results showed that the daily variations of net photosynthetic rate (Pn) and transpiration rate (Tr) exhibited a two-peak pattern. Pn was mainly affected by light, and had no obvious correlation with air temperature, leaf temperature and humidity. Tr correlated with light, air temperature and leaf temperature positively, but negatively with the humidity. Stomatal conductance appeared more sensitive to humidity than to light and temperature. Stomatal conductance and Pn responded independently to environmental factors. Water use efficiency of Ormosia pinnata peaked in the early morning and demonstrated a significant correlation with stomatal conductance in the daytime.
Keywords:Gas exchange  Net photosynthetic rate  Stomatal conductance  Daily variation
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