木麻黄天然更新主要影响因子的调查与分析

Investigation and Analysis on Impact Factors of Natural Regeneration for Casuarina equisetifolia

对木麻黄母树林与更新区距离及地被物盖度等因子对其天然更新影响进行了研究,结果表明:更新与母树分布情况及母树和更新区主风向上距离关系密切,在更新当年母树下风向更新区距离母树越近,幼树数量越多,保存数在距离母树10~30 m内为天然更新活跃区,随着距离延长更新能力减弱;盖度也是影响天然更新重要因子之一,地被物盖度越大,天然更新越困难,应对更新区的地被物进行清理;天然更新形成的幼树经过5 a左右生长逐渐自然枯死,保存数量大幅减少。木麻黄天然更新对于半风化岩石地、粗砂硬质土壤等人工难以栽植的地段快速成林及发挥木麻黄防护功能等有重要意义。

Through the analysis on natural regeneration of mature Casuarina equisetifolia forests,result shows that the regeneration distance is closely related to the distribution of the parent tree and the main wind in the regeneration area,the closer the distance between the parent tree and the main wind direction of the regeneration area,the more the number of preserved trees is within 10 m-30 m of the parent tree,which is the active area of natural regeneration,as the distance increased,the regeneration capacity decreased.Coverage is also one of the important factors affecting in natural regeneration,the larger the coverage,the more difficult the natural regeneration,therefore,the ground cover should be cleaned in the regeneration area.After about five years of growth,the number of saplings gradually withered and the number of preserved trees decreased significantly.The natural regeneration of Casuarina equisetifolia is of great significance for the rapid growth of forests in semi-weathered rocky soil,coarse sand and hard soil,which are difficult to be planted by man-made areas.