种源试验是探索各个种源的遗传变异规律,为种子调拨区划提供依据,以避免种子调拨中的混乱现象和调入不相宜的种子所造成的损失。造林试验是种源试验的组成部分,是继苗期之后另一阶段的试验。一个树种各个阶段的生长表现不一定相同,且其遗传基础的效应在某种程度上取决于和环境条件的统一,造林地 The provenance test is to explore the genetic variation rules of all provenances and provide the basis for allocating seeds to the seed so as to avoid the chaos in seed allocation and the loss caused by the introduction of inappropriate seeds. Afforestation experiment is part of the provenance experiment, following another stage of seedling after the experiment. The growth performance of a tree species at different stages is not necessarily the same, and its genetic basis of the effect to some extent depends on the unity and environmental conditions, afforestation