Investigation on adaptability and production performance of productive black poplar (Populus nigra L.) clones in the Markazi province, Iran

Document Type : Research article

Authors

1 Corresponding author, Assistant Prof., Research Division of Natural Resources, Markazi Agricultural and Natural Resources Research and Education Center, AREEO, Arak, Iran

2 Assistant Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran

3 Senior Forest Expert, Department of Afforestation and Forestry, Markazi Natural Resources and Watershed Administration, Arak, Iran

Abstract

    The present study was carried out in the nursery of Markazi Natural Resources and Watershed Administration of Iran in 2009 in order to select and introduce the most adaptable and productive poplar clones. For this reason, 10 clones of closed crown non-native black poplar for a period of 11 years were planted under the randomized complete blocks statistical design with three replications at 2×3 m2 spacing for adaptability studying. The characteristics of diameter at breast height (dbh), total height, total volume (stocking), mean increments of diameter, height and volume, crown area, survival percentage, trunk quality, branch density in the trunk and resistance to pests were measured and studied annually at the end of each growth period. The results of variance analysis showed that all the studied characteristics showed a statistically significant difference between different poplar clones, except for total height. According to the comparisons of means with Duncan’s test, the highest dbh, total volume and mean increments of height and volume were observed in P.n.62/154 clone whereas the lowest dbh, total volume, crown area, mean increments of diameter, volume and survival percentage were in P.n.56/32 clone. The highest bending and branch density in trunk and more susceptibility to pests were observed in P.n.56/33 clone than other studied clones. Clones of P.n.62/154, P.n.56/75 and P.n.62/172 with an annual volume increment of 80.63, 68.68 and 62.29 m3ha-1, respectively, were introduced as adaptable poplar clones with high wood production and suitable for planting in Markazi province.

Keywords

References

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