福建省马尾松群体和个体遗传变异的研究

<正>马尾松是福建省最重要的用材树种。本文对马尾松的群体和个体的遗传变异进行分析研究, 目的在于发掘当地树种的遗传资源,科学地制定马尾松的遗传改良程序,以及为当前林业生产中种子调拨和建立采种基地等工作提供依据。 1979年,共采集种子样本73份,包括全国不同产地、省内不同林分,同一林分不同家系和不同海拔高度的林分。1980年,于洋口,官庄林场作苗期比较。观测项目有种子大小,重量、发育程度、苗木高度,地径。封顶率和其它性状。根据试验结果,本文对各种变异类型做出了评价,并对福建省内马尾松的遗传改良程序提出初步意见。

GENETIC VARIATIONS BETWEEN POPULATIONS AND INDIVIDUALS OF MASSON PINE IN FUJIAN PROVINCE

The present paper deals with the results of a comprehensive experiment on seed; lings of masson pine (Pinus massoniana Lamb.) which is the most important timber species in Fujian Province. In order to study and exploit its natural genetic resource, some selected samples from different provenances (within its natural range), stands (in Fujian Province) and families (in a stand covering 75 mu) were compared so that the most economical breeding program could be found out. The results indicated that for all the measured phenological and morphological characteristics, provenance resu^ Ited in the highest degree of variation. Selecting suitable southern provenance plants for reproduction would obtain greater increment in the seedling stage. But they are by nature some populations in response to continuous ecological factors. Variations of plants among different stands showed a random pattern which indicated that the desirable stand would be within a short distance. As compared with plants from different stands, plants from different half-sib families could give greater variations in height growth, though their ecological characteristics were rather consistent. This suggests that when stands are to be selected, plus trees should also be simultaneously selected in order to establish clone seed orchards after progeny testing. Greater increment would be obtained from selections between half-sib families in addition to selections between different stands than from the latter alone. Variations among plants from stands at different elevation could provide more benefit than from among populations in the vicinity,