胡麻对亚麻象蛀食胁迫的补偿效应初探

A preliminary study on compensation effect of oil-flax yield traits under the boring stress of Ceuthrrhynchus liupanensis

为了阐明旱地胡麻对亚麻象蛀食胁迫的补偿效应,采用大田罩网法和伤口模拟危害法,结合田间调查分析和数据验证,研究亚麻象危害与胡麻产量及其相关性状补偿效应的相互关系,建立数学模型,模拟胡麻产生补偿效应的虫口密度范围。结果表明,虫口密度在20头/m^2时,千粒重、单株产量和小区产量的补偿系数最高,分别为17.74%、24.62%和26.97%。亚麻象危害指数和千粒重的模拟回归方程为y=-0.198 1x^2+0.902 9x+6.076 6(R^2=0.809 0),种群密度与危害指数模拟回归方程为y=0.020 3x+0.412 7(R^2=0.996 7),亚麻象种群密度与胡麻产量模拟方程为y=-0.005 1x^2+0.727 7x+86.107(R^2=0.881 4)。通过验证试验,对千粒重和产量的实测值与理论值进行Bonferroni配对比较的显著性检验,实测值与理论值差异不显著,拟合度较好。

Ceuthrrhynchus liupanensis is a kind of boring insect and compensatory response can be induced by boring stress of Ceuthrrhynchus liupanensis. The oil-flax has developed an important mechanism to adapt the boring stress,but there is a lack of relevant research. We aim to reveal the compensation effect of oil-flax yield traits under the boring stress of Ceuthrrhynchus liupanensis. A plot experiment was conducted to study the relationship between compensation effect of oil-flax and pest damage in different pest population density and wounds simulation test. The regression model was established to simulate the compensatory effect of oil-flax by using field investigation and data validation and the population density ranges of Ceuthrrhynchus liupanensis. Results showed that compensative coefficient was the highest at 20/m2,for 1000-seed weight,yield per plant and plot yield,the compensative coefficients were 17. 74%,24. 62% and 26. 97% respectively. The regression equation between damage index and 1000-seed weight was y =-0. 198 1 x2＋ 0. 902 9 x ＋ 6. 076 6（ R2= 0. 809 0）,the regression equation between population density and damage index was y = 0. 020 3 x ＋ 0. 412 7（ R2= 0. 996 7）,regression equation between population density and yield was y =-0. 005 1 x2＋ 0. 727 7 x ＋ 86. 107（ R2= 0. 881 4）. The test of significance showed that measured value and theoretical value had no significant difference,the goodness of fit was better.