首页 | 本学科首页   官方微博 | 高级检索  
   检索      

不同供水吸力对温室黄瓜光合特性及根系活力的影响
引用本文:李邵,薛绪掌,郭文善,李霞,陈菲.不同供水吸力对温室黄瓜光合特性及根系活力的影响[J].应用生态学报,2010,21(1):67-73.
作者姓名:李邵  薛绪掌  郭文善  李霞  陈菲
作者单位:1. 扬州大学江苏省作物遗传生理重点实验室,江苏扬州225009;国家农业信息化工程技术研究中心,北京100097
2. 国家农业信息化工程技术研究中心,北京,100097
3. 扬州大学江苏省作物遗传生理重点实验室,江苏扬州,225009
基金项目:北京市农业科技示范推广项目和扬州大学研究生培养创新工程项目资助
摘    要:采用一种负水头供水控水盆栽装置,通过设定不同供水吸力(1、3、5、7、9、11、13kPa)来控制不同土壤含水量,研究土壤水分对黄瓜光合、荧光参数的变化及根系生长的影响.结果表明:供水吸力与土壤含水量呈反比对应关系,各处理控制的土壤含水量范围为14.23%~42.32%;随供水吸力的增强,不同生育时期黄瓜叶片净光合速率都呈抛物线变化趋势,初花期7~11kPa处理和采收期3~5kPa处理叶片的净光合速率较强,采收期9~13kPa的高供水吸力处理叶片净光合速率较低是由气孔限制因素导致的,而1~5kPa低供水处理下叶片PSⅡ光量子转化成化学能的效率较高,实际光化学效率较高,光抑制发生的可能性较低;不同生育时期叶片叶绿素含量和蒸腾速率与净光合速率呈明显的正相关关系;随供水吸力的增强,黄瓜根系生长及活力呈抛物线变化趋势,5kPa处理的根系活力最高,7kPa处理的根系干物质量最大.说明3~7kPa的供水吸力处理更有利于温室黄瓜根系生长与叶片净光合速率的提高.

关 键 词:负水头控水  光合特性  荧光特性  根系活力  黄瓜

Effects of water supply tension on photosynthetic characteristics and root activity of greenhouse cucumber.
Institution:Jiangsu Province Key Laboratory of Crop Genetics and Physiology, Yang
zhou University|Yangzhou 225009, Jiangsu, China|National Engineering Re
search Center for Information Technology in Agriculture|Beijing 100097, China
Abstract:To study the effects of soil water content on the photosynthesis, fluo
rescence parameters, and root growth of greenhouse cucumber (Cucumis sativus L.)
, a pot experiment was conducted, using a negative pressure water supplying and
controlling device to control soil moisture regime. Seven levels of water supply
 tension (WST), i.e., 1, 3, 5, 7, 9, 11, and 13 kPa, wer
e designed. The WST was inversely proportional to soil water content, and the gr
avimetric soil water content was maintained in the range of 14.23%-42.32%. With increasing WST, the leaf net photosynthetic rate (Pn)
in different growth periods showed a parabolic trend, being higher when the WST
was 7-11 kPa at initial flowering stage, and was 3-5 kPa at fruiting stage. The reason for the decreased Pn at 9-13 kPa WST was stomatal limitation. Under 1-5 kPa
 WST, the actual photochemical efficiency (Φ PSⅡ ) had a high value,a
nd the possibility of photo inhibition was small. Both the leaf transpiration ra
te and the chlorophyll content were positively correlated with leaf  Pn in
different growth periods. Root growth and activity also had a parabolic trend wi
th increasing WST. The maximum root dry mass and root activity happened at 7 kPa
 and 5 kPa WST, respectively. Our results indicated that a WST of 3-7 kPa was more profitable for the leaf photosynthesis and root growth of g
reenhouse cucumber.
Keywords:negative pressure water control  photosynthetic characteristics  fluo
rescence characteristics
  root activity  cucumber
本文献已被 CNKI 万方数据 等数据库收录!
点击此处可从《应用生态学报》浏览原始摘要信息
点击此处可从《应用生态学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号