阶段亏水条件下水稻产量及水分生产率的通径分析

Pathway Analysis of Rice Yield and Water Productivity Based on Water Deficit dring Different Stages

以水稻辽星9号为材料,进行盆栽试验,测定了分蘖前、分蘖末、拔节孕穗、抽穗开花、乳熟5个生育阶段不同程度亏水下,水稻的有效穗数、穗长、每穗粒数、实粒数、千粒质量、总腾发量、最大分蘖数、收获时蘖数、株高、根干质量、茎干质量、叶干质量、产量。采用相关分析和通径分析的方法,计算了各指标对产量和水分生产率的相关系数、通径系数、决定系数和对回归方程估测可靠程度的总贡献,建立了各指标对产量和水分生产率的回归方程。结果表明,在阶段亏水条件下,水稻有效穗数、每穗粒数、实粒数的提高和协调有助于实现高产的目标;在提高水稻水分生产率的过程中,产量的直接作用大于总腾发量,同时,应充分考虑土壤水分状况对水稻有效穗数、每穗粒数、实粒数、收获时分蘖数、根干质量的调节和促控作用。

Pot experiments were conducted under different status of water deficit during different stages of rice whose breed was middle-season rice ＂Liao Xing No.9＂.Valid spikes,spike length,kernel number per spike,filled grains number,weight of 1000 grains,total evapotranspiration,maximum tillers number,tillers number at harvest time,plant height,root dry weight,stem dry weight,leaf dry weight,rice yield and water productivity were measured after different status of water deficit during five stages including tillering initial stage,tillering final stage,jointing stage,heading stage and milk maturity stage.Regression equations with the dependent variable was rice yield and water productivity influenced by indexes above were established,respectively;correlation coefficient,path coefficient,determination coefficient and the total contribution of R2 represented the reliability of regression equation estimating between each index and rice yield or water productivity were calculated by correlation analysis and path analysis respectively.The results showed that the promotion and coordination of valid spikes,kernel number per spike and filled grains number based on water deficit during different stages were in favor of increasing yield.Therefore,regulation and promote control function of soil water on valid spikes,kernel number per spike,filled grains number,tillers number at harvest time and root dry weight should be serious consideration.The research provided a direction for improving water productivity of rice.