水稻叶水势与不同水分处理定量关系研究

研究了不同水分处理对水稻各生长发育时期的影响,确立了水稻叶水势与不同水分处理之间的变化规律与相关关系,并在不同水分条件下水稻叶水势动态变化特征的基础上,建立了温度、光照、水分与叶水势的定量关系及各不同生长发育时期的叶水势变化规律.通过这些量化关系可以与实测叶水势相结合,实现较快地得到水稻叶水势的值,从而判定其是否出现了水分亏缺,以利于及时准确地对水稻进行灌溉.与此同时,得出了两个品种水稻(中9B,金早47)在主要生育期用于判断水分亏缺状况的临界叶水势值,为水稻的节水灌溉提了依据.

Quantitative relationship between water supply level and leaf water potential (LWP) in rice.

The investigation was mainly conducted to study the effect of water supply level on leaf water potential(LWP) of rice.Results of the experiments revealed some useful quantitative relations between them.And the relations between temperature,illumination,water level and LWP in the different growth periods of rice were also established.With the concluded quantitative relations between LWP and environmental ingredients,the value of the LWP can be calculated under the different circumstance.So we could get the LWP value more easily and detect the water status of the plant more quickly and punctually.In this study,we also found the critical point of LWP of the two varieties of rice-Zhong 9B & Jinzao 47 in the three main growth stages,which is an important factor for diagnosing whether the plant is suffering water stress or not.So it could be used for irrigating rice crop more punctually and economically.