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甜瓜叶片气体交换特性和幼苗生长对土壤水分和大气湿度的响应
引用本文:陈年来,黄海霞,高慧娟,安黎哲.甜瓜叶片气体交换特性和幼苗生长对土壤水分和大气湿度的响应[J].兰州大学学报(自然科学版),2009,45(4).
作者姓名:陈年来  黄海霞  高慧娟  安黎哲
作者单位:1. 中国科学院,寒区旱区环境与工程研究所,兰州,730000;甘肃农业大学资源与环境学院,兰州,730070
2. 甘肃农业大学资源与环境学院,兰州,730070
3. 中国科学院,寒区旱区环境与工程研究所,兰州,730000
基金项目:国家科技支撑计划项目 
摘    要:采用温室盆栽试验,研究了土壤水分和大气湿度及其交互作用对甜瓜壮龄叶光合作用特性的影响.结果表明:轻度土壤水分胁迫下,气孔因素是导致甜瓜叶片光合速率下降的主要原因.土壤水分严重亏缺使甜瓜叶肉光合能力降低,引起胞间CO2积累,叶片光合速率与蒸腾速率同步下降.在土壤湿度极低时,较高的空气湿度有助于诱导气孔开张.土壤水分充足时,过高的空气湿度导致甜瓜叶片气孔导度下降,叶肉细胞CO2供应不足,光合速率降低.甜瓜生产中土壤湿度应不低于最大持水量的50%,空气湿度宜控制在70%以下.

关 键 词:甜瓜  生理生态  光合特性  气孔导度  大气湿度  土壤水分

Responses of gas exchange and seedling growth of Cucumis melo L.to soil moisture and air humidity
CHEN Nian-lai,HUANG Hai-xia,GAO Hui-juan,AN Li-zhe.Responses of gas exchange and seedling growth of Cucumis melo L.to soil moisture and air humidity[J].Journal of Lanzhou University(Natural Science),2009,45(4).
Authors:CHEN Nian-lai  HUANG Hai-xia  GAO Hui-juan  AN Li-zhe
Institution:1;2;1.Cold and Arid Region Environmental and Engineering Research Institute;Chinese Academy of Science;Lanzhou 730000;China;2.College of Resource and Environmental Sciences;Gansu Agricultural University;Lanzhou 730070;China
Abstract:Soil moisture and air humidity are important factors affecting plant metabolism including photosynthesis. Cucumis melo L.was employed in this experiment to investigate the impact of soil moisture and air humidity on photosynthesis of melon.The results show that photosynthesis of melon leaves were more sensitive to soil moisture than to air humidity.Stressed soil moisture reduced the photosynthetic capacity of mesophyll cells,resulting in decreased stomatal conductance and CO_2 diffusion.High air humidity al...
Keywords:Cucumis melo L    ecophysiology  photosynthesis  stomatal conductance  air humidity  soil moisture  
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