Abstract: Based on the data of provenance test for 17 years in the whole natural distrbution range of Larix olgensis,the geographic variation patterns were analyzed by canonical correlation analysis(CCA).The results showed that the basic variation patterns of Larix olgensis,and it had the genetic character of rapid growth and long growing period.The synthetical interaction between water and heat factors mainly caused the variation of Larix olgensis,and among those factors,the temperature was the key factor.Among the genetic variation of geographic population characters,the variation of growth character was the most obvious,and it could be taken as the main character for provenance division.Allocating seeds from low equivalent latitude region to northern suitable afforestation areas(within 2 equivalent latitudes)would bring on great genetic gain.

Key words: Larix olgensis, Population, Geographic variation, SEOC, mineralization rate., cumulative mineralization amount, biocrust coverage, disturbance intensity, SOC