杉木第3代良种早期生长增益分析

Early growth gain of Chinese fir 3rd generation seed orchard

基于6a生良种对比试验林,分析杉木第3代良种的早期生长增益。结果表明第3代良种林分4a林龄后,保存率稳定维持在86.17%,树高连年生长量达到最大值1.55m。6a林龄时树高达到6.60m,比第2.5代良种大10.00%;胸径达到10.53cm,比第2.5代良种大28.57%;单株立木材积达到0.03581m^3,比第2.5代良种大67.81%。第3代良种树高、胸径和单株立木材积在单株间的分化程度较第2.5代良种低39.72%、27.72%和24.33%,具有更高的林分整齐性。因此杉木第3代良种可作为良种在泰宁产区推广应用。

The early growth gain of Chinese fir 3rd generation cultivar was examined based on 6-year-old test plantation.The preservation rate of tested 3rd generation cultivar stabilized at 86.17% at the age of 4 years old, the annual growth of tree height got the max value of 1.55 m at the same age. The average of tree height, diameter at breast height(DBH) and individual volume of 3rd generation cultivar was 6.60 m, 10.53 cm and 0.03581 m3 respectively at the age of 6 years old,reaching more 10.00%, 28.57% and 67.81% than that of (2.5)th generation cultivar in growth gain. Moreover, the differentiation of 3rd generation cultivar in tree height, DBH and individual volume was less 39.72%, 27.72% and 24.33%than that of (2.5)th generation cultivar. Therefore, the 3rd generation cultivar could be considered as an improved variety in Taining production area.