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研究沿海防护林种群生长竞争规律对营建高效沿海防护林具有重要意义。对苏北海堤不同栽植密度下12 a生刺槐人工林进行生长情况调查,研究种群生长的空间及竞争特征。结果表明,随着密度的增加,刺槐平均胸径(DBH)呈下降趋势,3 m×3 m密度下刺槐平均胸径为13.3cm,单株刺槐生长量最大,而1 m×1 m密度下单位面积刺槐生物量最高。高密度下种内竞争激烈,死亡率高。刺槐胸径的空间分布规律存在差异,随着栽植密度的增高,刺槐胸径的空间变异性增大。因此,营建刺槐防护纯林密度不宜过高,不同栽植密度下刺槐种群竞争规律及机制还有待进一步研究。
Studying the competition rules of coastal shelterbelt population growth is of great significance to the construction of an efficient coastal shelter forest. The growth of 12-year-old Robinia pseudoacacia plantations under different planting densities in North Jiangsu sea wall was investigated to study the spatial and competitive characteristics of population growth. The results showed that the average DBH of black locust decreased with the increase of density. The average DBH of Robinia pseudoacacia was 13.3 cm at 3 m × 3 m density, and the highest growth was at locust (1 m × 1 m) Black locust has the highest biomass. High-density competition within the species, high mortality. The spatial distribution of breast diameter of Robinia pseudoacacia was different. With the increase of planting density, the spatial variability of DBH diameter increased. Therefore, the density of pure locust protection forest should not be set too high. The competition rules and mechanisms of locust population under different planting densities have yet to be further studied.