Variation in adaptation and growth as indicated by provenance trial Platycladus orientalis (L.) Franco

Abstract

Platycladus orientalis (L.) Franco is an essential tree species for natural conservation and ornamental use in northern and central China. It grows under diverse range of soils with pH 5–8. In 1982 and 1986 provenance trials of whole range, including over 30 seed origins derived from 17 provinces were laid out at 30 experiment sites in total. Response to drought, frost stresses growth and growth rhythm was investigated. Significant differences in performance of seedlings and young trees derived from different origins were found at all sites. Seed origins for this species significantly differ for both adaptation and growth. The variation is closely correlated with altitude and longitude in particular. According to comprehensive investigation and evaluation, five zones and two sub-zones were divided for seed transfer and reforestation using statistic technique. Furthermore, provenance trial provides intraspecific variation patterns, which are extremely valuable information in consideration of the global change.