不同产地青杨抗寒性变异的研究

Cold Tolerance Variation of Populus cathayana Clones from Different Populations

应用电导法测定电解质渗漏质，研究了青杨分布区内２１个产地、每产地１７个单株的三年生幼树上的一年生休眠枝条的抗寒性，结果表明：产地内单株间有差异，产地间抗寒的能力与纬度变化呈显著正相关。此外还调查了各产地青杨的封顶期及芽萌发期，发现不同产地青杨的封顶期、芽萌发期也与纬度呈正相关变化。说明不同产地的青杨秋末抗早霜。

This article expounded the cold tolerance of 21 populations of Populus cathayana clones,which was measured by conductimetry method. The samples collected for the experiment were one year old dormant shoots of three year old trees which came from 17 individuals of each populations. Differences were found among individuals within the same populations,but the differences among populations were significant. Cold tolerance among populations correlated with latitude positively. The dormant time and budbreak time were also investigated and it showed that the dormant time and budbreak time correlated positively with latitude,which demonstrated that the early frost tolerance in late autumn,cold tolerance in winter and late frost tolerance in early spring of each populations were the result of adapting the ecological factors of origin places.