巨桉种源引种选择研究

RESEARCH ON THE INTRODUCTION OF EUCALYPTUS GRANDIS PROVENANCE

用巨桉自然分布区两大地理种群种源和巴西人工林选择出的２个种批号进行巨桉种源引种选择试验。经过几年的栽培观测，反映出种源性状存在着极显著差异，种源间的遗传变异不规律。综合多个性状因子选择出４个优良种源，在生长量、干形、长势、适应性、林分的稳定性等方面比其它参试种源优良。入选种源平均单株蓄积比其它种源平均单株蓄积大２２９４％，比对照（四川大叶桉）平均单株材积大８１３１％。为巨桉栽培中种子的调进和改良奠定了实验基础。

The provenance of Eucalyptus grandis from two geographical interpopulations in natural distributed area and two groups of seeds selected from Brazil grandis plantation were included in the introduction experiment. After several years observation, it is shown that the difference between provenances is remarkable and the variation of provenances is not regular. Four fine provenances were selected based on the test multiple factors such as increment, trunk, growing way, suitibality etc. The results show that average volume per tree of selected provenance is 22 94% more than the average voume of other provenances unselected and 81 31% more than check (E.robusta). The experiment lay a foundation for the introduction and improvement of E.Grandis. The general characteristics of E.Grandis are also illustrated in the research.