Survival and growth of the tree species and provenances in response to salinity on a discharge site

作者：Nico E. Marcar, Debbie F. Crawford, A. K. M. A. Hossain, A. T. Nicholson · 发表于：Australian Journal of Experimental Agriculture · 年份：2003 · DOI：10.1071/ea02192 · 被引用次数：25 · 研究领域：Tree Root and Stability Studies、Forest ecology and management、Plant Water Relations and Carbon Dynamics

The survival and growth of 24 native tree species planted in 2 trials on a saline discharge site, which had a soil salinity gradient as well as watertable depth and salinity, near Wellington in central-west New South Wales were investigated. Several provenances of some species (including Acacia stenophylla , Eucalyptus camaldulensis and E. spathulata ) and clones of E. camaldulensis and E. spathulata , were also evaluated. Each accession was represented by a 5-tree row plot with 8 replications. Root-zone salinity (ECe0–60 cm) at the tree and plot level was calculated from in situ measurements of bulk soil salinity using an EM-38 device (Geonics, Canada). Growth measurements are reported at 72 (trial 1) and 61 months (trial 2) after planting. For each trial, 4 replicates were classified as either non-saline (mean ECe <2 dS/m) or saline (ECe range from about 6 to 10 dS/m). Watertable depths varied from 0 to 1.5 m (depending on season) in the saline areas to >4 m in the non-saline, upslope areas. Survival and growth differed significantly between species, provenances and clones in both trials and under both saline and non-saline conditions. For most accessions, trees survived and grew better under non-saline conditions. Under non-saline conditions A. mearnsii , E. camaldulensis and E. occidentalis performed best; for example, A . mearnsii (16268) attained a mean height of 7 m and mean DBH of 11 cm at 61 months in trial 2. Under saline conditions, A. stenophylla , E. camaldulensi...