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在调查2010年6—7月大风对黄河三角洲地区人工刺槐林的影响基础上,测定了风倒木形态指标、根系特征及其所处林窗的大小和土壤紧实度,分析滨海盐碱地人工刺槐林风倒的成因.结果表明:风倒是刺槐林遭受风害的主要形式,以胸径15～20cm的树木受害最严重.随着径级的增加,风倒木的树高、冠幅、冠高和尖削度显著增加,而枝下高、冠幅/冠高和枝下高/树高变化不显著;根系长度先迅速增加而后增加缓慢,根系质量逐渐增加.随林窗面积增加,倒木株数先增加后下降,100～150m2林窗倒木株数最多.土壤紧实度随土壤深度增加而增加,而随样木径级增加变化不显著.随径级增加,树形因子增大、根系生长受抑是刺槐风倒的重要原因,而林窗起到了促进作用.
Based on the investigation of the effect of the gale on the Artificial Robinia pseudoacacia in the Yellow River Delta from June to July in 2010, the morphological characteristics of the fallen tree, the characteristics of the root system, the size of the forest window and soil compaction were measured. The results showed that windfall was the main form of windbreak in Robinia pseudoacacia forest, and the trees with diameter of 15-20cm had the most serious damage.With the increase of diameter class, the tree height, crown width, crown height and tip But the height of crown, crown width / crown height and branch height / tree height did not change significantly.The root length increased rapidly and then increased slowly, the root quality increased gradually.With the increase of forest window area, the number of fallen wood first increased , And the number of fallen wood in the gaps of 100-150 m 2 was the largest.The soil compaction increased with soil depth but did not change significantly with the increase of wood diameter.With the increase of diameter, Wind down an important reason, while the window played a catalytic role.