贵州省油茶林地生产力与种群构件特征分析

Analysis on the Relationship between the Production and the Characteristics of Population Modules of Camellia oleifera Abel. in Guizhou

通过调查全省12个油茶主产区的县市的油茶产区,涉及样地69个,调查标准株373株,调查内容包括林地类型、产量(Y)以及冠幅面积(X1)、分株数(X2)、平均地径(X3)、平均树高(X4)、分枝总数(X5)、分枝高度(X6)、分枝角度(X7)、1年生枝条长度(X8)、1年生叶片数量(X9)、2年生枝条长度(X10)、1年生枝总数(X11)、总花芽数(X12)、果径(X13)、单果重(X14)等构件因子。结果得到分株数、平均地径、平均树高、分枝角度、单果重量等指标相关性显著,是影响贵州省油茶林地生产力的限制性因子。逐步回归得到回归方程Y=-17.73976410+14.672240247X2+19.083828811X3-34.99973960X4+8.732365441X14,通径分析表明油茶产量与分株数增加、平均地径增大、平均树高减小、分枝角度增大以及单果重增大等因素相关。

To tap the production potential of the camellia plantation, the relationship between the production and the characteristics of population modules of Camellia oleifera Abel. in Guizhou was studied. To do so, 69 plots were set in 12 main producing areas, in which a total of 373 standard trees were selected. The investigated parame- ters were ： type of the plantation, yield （ Y）, crown range area （ X1 ）, the number of ramets （ X2 ）, the average di- ameter （ X3 ）, average tree height （ X4 ） , the total number of branches （ X5 ）, the branching height （ X6 ）, the branching angle （ X7 ） , 1 - year - old shoot length （ X8 ） , the number of 1 - year - old leaves （ X9 ） , the twig length of 2 - years - old branches （X10） , the total number of 1 - year - old branches （ Xll ） ,the total number of flower buds （ X12 ）, the fruit diameter （ X13 ）, the weight of single fruit （ X14 ）. The result showed that the number of ramets （ X2 ） , the average diameter （ X3 ）, average tree height （ X4）, the branching angle （ X7 ）, and the weight of single fruit （X14） have significant correlation, and they are the main limiting factors for productivity of camellia plantations in Guizhou province. The multiple regression equation was as follows： Y = - 17.73976410 ＋ 14. 672240247X2 ＋ 19. 083828811X3 - 34. 99973960X4 ＋ 8.732365441X14. Result of path analysis showed that yield increase of camellia plants correlates with increased ramet number, increased average diameter, decreased a- erage tree height, increased branching angle, and increased weight of single fruit.