比较9种稳定性参数在甘蔗品种区试上的应用

利用24个甘蔗品种7点区试的蔗产量数据,比较分析了评价品种稳定性的9种参数方法.S_i~2和 CV_i 2种参数评价的结果相似,不适于用评价受环境影响大的蔗产量的稳定性.4种参数θ_i、θ_(i)、ω_i~2、σ_i~2评价的结果完全一致,其中ω_i~2计算简便,σ_i~2为无偏估计值,更适用于评价区试中甘蔗品种的稳定性.回归参数方法中,b_i 只把品种大致分为3种适应类型,类内难以比较.以 b_i 和δ_i~2共同分析品种稳定性,不仅能表示品种的稳定性强弱,还能反映品种随环境变化的反应模式,最适合用在甘蔗品种区试上.B_i 和δ_(?)~2参数方法统计上等价于 b_i 和δ_i~2分析的品种稳定性结果也有相似的趋势.

COMPARISON OF NINE STABILITY PARAMETERS APPLIED TO THE REGIONAL TEST OF SUGARCANE VARIETIES

The 9 parameter methods for evaluting variety stability were compared by using cane yield data of 24 sugarcane varieties tested on 7 locations of Fujian Province.The stability ranks were similar between two parameter S~2_i and CV_i which could not suitable for evaluting the stability of cane yield effected largely by the environmental factors.The varietal se- quences of stability were completely the same among 4 parameters θ_i,θ_((i)),ω~2_i and σ~2_i,of which the calculation of ω~2_i was simple and σ~2_i was an unbiased estimate of GE interaction, both of them were more suitable for assessing the stabilities of sugarcane variety in the re- gional test.In the three kinds of regressional parameter methods,b_i could only divide the varietal stabilities into three groups and were difficult to compare within each group.The ana- lysis of variety stabililties made with b_i and δ~2_i together were the most suitable to apply on the regional test of sugarcane varieties,because they could not only show the states of variety stability,but also reflect the forms of variety response to the changing environments.The parameter B_i and δ_i~2,were identical with b_i and δ~2_i statistically and their results of variety stability analysis showed the similar tendencies.