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本文从利弊两个方面讨论了关于种子园无性系的系统分布,其结论是系统排列能提供较多的优越性。对于从9到65的无性系所有数量来源,考察最佳系统排列的尺度将满足如下三个基本的必要条件:(1)模式图在所有方向上的可扩张性;(2)任何一个无性系的所有样本的最大分布性;(3)预先规定各次疏伐最大限度不影响分布的可能性。能获得正方形分布的那些无性系数量应评价为最好的数量。如图-1的排列对于9、25和49个无性系是可以实行的。对于其它无性系的数量而言,需要一种连贯的排列(如图-2和图-3),在这种情况下,分布是由无性系的数量来决定的,借此无性系-1便被定位(指示值)。关于9到65的无性系数量的指示值,以及用植距单位表示的隔离,均列于表-1。在这里的排列中,正方形的分布仅由如下无性系的数量来获得:13,17,25,29,37,41,53,61和65。如图-4所示,具有特殊排列的45个无性系,将同样给出一种正方形的分布。偶数仅许可一次50％的疏伐,而奇数则能进行任何次数的疏伐。
This paper discusses the system distribution of seed orchard clones from two aspects of the pros and cons. The conclusion is that the systematic arrangement can provide more advantages. For all sources of clones from 9 to 65, examining the scale of the optimal system arrangement will satisfy the following three basic requirements: (1) the expansibility of the pattern in all directions; (2) any one of the clones Of the maximum distribution of all samples; (3) pre-provision of each thinning does not affect the distribution of the possibility of the maximum. The number of clones that can obtain a square distribution should be evaluated as the best. The arrangement shown in Figure-1 is feasible for 9, 25 and 49 clones. For the number of other clones, a coherent arrangement is required (Figure-2 and Figure-3), in which case the distribution is dictated by the number of clones through which clone 1 Positioned (indicated value). The indicated values for clonal numbers from 9 to 65, as well as the isolation in plantation units, are shown in Table-1. In the arrangement herein, the distribution of squares is obtained only by the number of clones as follows: 13,17,25,29,37,41,53,61 and 65. As shown in Fig. 4, 45 clones with a special arrangement will likewise give a square distribution. Even numbers allow only a 50% thinning, while odd numbers can be thinned any number of times.