Responses of radial growth of Fraxinus mandshurica from different provenances to climate at Maoershan in Northeast China
To understand the responses of radial growth of Fraxinus mandshurica from different provenances to cli-matic factors,we used the dendrochronological method to establish the standard chronologies of F.mandshurica from 20 provenances in Maoershan provenance test forest,and analyzed the differences in radial growth and their correlation with climate factors.The results showed that the overall trend of F.mandshurica chronologies from 20 provenances was generally similar.There were differences in growth amplitude,with the average radial growth of F.mandshurica from Dailing,Lushuihe and Sanchazi being the highest.The radial growth of F.mandshurica from 20 provenances was significantly positively correlated with the highest temperature in July and the average temperature in July except for Huinan.The radial growth of F.mandshurica from 14 provenances was significantly positively cor-related with the precipitation in August.The radial growth of F.mandshurica was constrained by temperature and precipitation during the growing season.There was difference in radial growth among F.mandshurica from different provenances under drought stress.F.mandshurica from Wangqing,Dailing,and Hailin had stronger resistance to drought,while that from Wandianzi,Zhanhe,and Xinglong had better recovery ability after drought.
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