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为了评价花旗松(Pseudotsuga menziesii)的39个全同胞家系对三种不同氮肥的反映,于1973年夏在温室进行了研究。在因子分析设计中,这39个家系各用了约60株实生幼苗。十周后测量每株树的高度和直径;十四周后,测量高度、直径、干重、枝根比和叶氮浓度。应用裂区方差分析法分析数据。发芽的结果和种子大小的影响均作了评价。还作了方差分量和遗传相关的估计。全部结果可摘要如下: 1、除叶氮浓度外,从14周后所测得的诸参数方面观察到家系×氮肥的相互作用。有些家系在某一特定氮量条件下表现好,而另一些家系则在所有氮量条件下都好。株高和直径生长与氮肥的相互作用表明:根据有效利用氮肥的能力作生长性状方面的选择,就花旗松来说可能是一种成功的措施。 2、从测得的全部参数发现显著的家系效应。株高、直径、干重、枝根比以及叶氮浓度都处于显著的遗传控制之下,使得选择和育种在兼备全面能力方面可能获得成功。 3、株高、干重和枝根比在表现型和遗传型方面都是彼此成正相关。因此可以预言:对于某一特征的人工选择会在其它特征方面带来一种正反应。 4、叶氮浓度与干重成负相关,而叶总氮量与干重则成正相关。这就指出:生长较快的家系比生长较慢的家系每单位叶干重有较少的氮量,但每株树却有较多的氮量。 5、实生苗的株高和重量对种子重量的相关分析表明无明显的种子大小的效应。这有限的研究效果可说明,花旗松家系×氮肥相互作用效果,在幼苗第一生长季末就可以鉴定。但此项研究可靠性怎样,还需要长期的研究,看造林以后,各家系在不同量的氮肥作用下生长情况怎样,才能结论。
To assess the response of 39 whole-sib families of Pseudotsuga menziesii to three different nitrogen fertilizers, a summer 1973 study was conducted in the greenhouse. In the design of factor analysis, each of the 39 families used about 60 seedlings per plant. Ten weeks later the height and diameter of each tree were measured; after fourteen weeks the height, diameter, dry weight, shoot-root ratio and leaf nitrogen concentration were measured. Analysis of data using split-zone analysis of variance. The effects of germination and seed size were evaluated. A variance component and a genetically related estimate were also made. The overall results can be summarized as follows: 1. In addition to the leaf nitrogen concentration, the family × nitrogen fertilizer interactions were observed from the parameters measured after 14 weeks. Some families performed well under a particular nitrogen level, while others were good at all nitrogen levels. The interaction of plant height and diameter growth with nitrogen fertilizer suggests that the choice of growth traits based on the ability to efficiently use nitrogen fertilizer may be a success measure for Douglas-fir. 2, Significant pedigree effects were found from all measured parameters. Plant height, diameter, dry weight, root / shoot ratio, and leaf nitrogen concentration were all significantly under genetic control, making selection and breeding potentially successful with both full capacity. Plant height, dry weight and root-shoot ratio were positively correlated with each other in phenotype and genotype. Therefore, it can be predicted that the artificial selection of a feature will bring a positive response to other features. Leaf nitrogen concentration was negatively correlated with dry weight, while leaf total nitrogen was positively correlated with dry weight. This suggests that families with faster growth have less nitrogen per unit leaf dry weight than families with slower growth, but have more nitrogen per tree. Correlation analysis of plant height and weight of seedlings to seed weight showed no significant seed size effect. The limited research results indicate that the effect of Douglas fir family × nitrogen fertilizer interaction can be identified at the end of the first growth season of seedlings. However, what is the reliability of this study, but long-term research is also needed. After seeing afforestation, we can conclude the growth of families under different amounts of nitrogen fertilizer.