不同土壤水分供给下水稻叶水势的变化规律  

RESPONSE OF LEAF WATER POTENTIAL IN RICE TO DIFFERENT SOIL WATER SUPPLY LEVELS

作　　者：徐林娟[1] 徐正浩[1,2] 李舸[2] 何勇[1] 谢法权 孙映宏[3] 袁侠凡 

机构地区：[1]浙江大学生物系统工程与食品科学学院,浙江杭州310029 [2]浙江大学环境与资源学院污染环境修复与生态健康教育部重点实验室,浙江杭州310029 [3]杭州市水文水资源监测总站,浙江杭州310014 [4]浙江天凌农业科技有限公司,浙江诸暨311800

出　　处：《核农学报》2011年第3期553-558,共6页Journal of Nuclear Agricultural Sciences

基　　金：浙江省科技计划项目(2008C23010;2008C35018);教育部人文社会科学研究一般项目(06JAZH001)

摘　　要：用中9B和金早47在温室及网室条件下,设置4个水分处理,对不同生育期的叶水势进行测定。结果表明,不同水分处理下,主要生育期的叶水势日变化表现为早晨和傍晚较大,而在中午前后较小,呈现反抛物线的曲线走向,中午前后是叶水势曲线拐点。水稻叶水势随着土壤水分含量的下降而降低,土壤保持湿润处理和淹水处理的水稻叶水势差异不明显,而水分胁迫和湿润处理之间叶水势差异明显,这种差异随水分胁迫加重而加大。水稻材料在分蘖期的叶水势与土壤含水量之间具有良好的线性相关性。水稻叶水势随生育进程而降低,反映了水稻叶片随生育进程老化的规律,不同生育期水稻出现水分胁迫的中午叶水势临界值分别是分蘖期<-1.60 MPa,孕穗期<-1.70 MPa,抽穗期<-1.80 MPa,这些指示值在供试的2个水稻材料中差异不大。The response of indica rice to water supply levels was studied by pot experiment.Zhong 9B and Jinzao 47 were used as studied materials.The experiments were carried out by using four kinds of soils under climatological chamber and greenhouse conditions at rice vegetative growth stage.Results showed that the diurnal changes of leaf water potential（LWP） in rice at vegetative stages under different soil moisture treatments tended to be higher at early morning and late afternoon,but lower at the midday time,which displayed a nearly parabolic curve with the inflection point appeared around the midday time.The differences in LWP between the moisture irrigation condition and the water stress condition were more significant than that between the submerged irrigation condition and the moisture irrigation condition.LWP in rice declined at plant developmental stages,and LWP was less than-1.60 MPa,-1.70 MPa and-1.80 MPa at the midday time at tillering,booting and heading stages,respectively.These data could be served as a predictor for the onset of water deficiency in both tested rice materials.

关 键 词：水稻 叶水势 日变化 土壤水分 节水灌溉 

分 类 号：S511[农业科学—作物学]