不同种植年限皇竹草产量与生物学性状关系分析

Correlation analysis between yield and morphological traits of hybrid giant napier of different growth years

为研究不同种植年限皇竹草（Pennisetumhydridum）产量与生物学性状之间的关系，对生长1～3年的皇竹草一年内不同时期的产量及生物指标进行跟踪观测。结果表明，皇竹草植株株高、分蘖数、有效茎数和产量等均随种植年限的增加而明显提高，其相互间关系极显著正相关。通过相关性分析和通径分析发现，有效茎数、节数和分蘖数对皇竹草产量的直接和间接作用最大。同时，一元回归分析显示，以节数为变量的拟合程度最高，而五元线性回归模型Y=一23．742＋0．031Xl＋0．261x2＋0．187）（3＋0．025X4＋0．825X~，R^2=0．822（P〈0．01）对不同种植年限的田间实际产量拟合最佳。综合分析认为，植株分蘖数、有效茎数和节数为皇竹草产量的最重要影响指标。

In order to study the relationship between grass yield and morphological traits of hybrid giant napier （Pennisetum hydridum）, some important morphological traits including fresh yield, plant height, tiller numbers, etc. were investigated in 2009. Relativity and multiple linear regressions of confirming the dominant morphological traits on impacting yield were also analyzed. The results showed that there were significantly positive correlations among yield and plant height, tillers, numbers of effectual stems; en hanced with the increase of growth years of the hybrid giant napier after planted. The correlation analysis and path analysis found that the greatest direct and indirect effects on fresh yield of hybrid giant napier were its effectual stem numbers, node and tiller numbers. A simple regression analysis showed that the fitting degree of numbers of nodes and fresh yield was the best among the single variables. Moreover, the five linear regression model, Y= -23. 742＋0. 031X1 @0. 261X2 ＋0. 187X3 ＋0. 025X4 ＋0. 825X5 , Rz = 0. 822（P〈0.01）, was the optimal model for the fresh yield of hybrid giant napier with different growth years. The fresh yield of hybrid giant napier can be predicted by the regression equation. The numbers of tillers, effectual stems and nodes of hybrid giant napier have the most important contribution to its fresh yield.