Growth analysis of an aged Turkey oak coppice under conversion into high forest

Monica Notarangelo, O. L. Marca
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Abstract

Most Italian research concerning the conversion of coppices analyse growth response at the stand level and adopt absolute growth as reference metric. Nonetheless, inter-individual interactions are lost when averaging tree level information at the stand level. Moreover, absolute growth ignores the initial size of individuals under comparison, the growth of large trees will thus always outperform that of small trees, and nothing can be inferred about tree-to-tree competition. We modelled the growth response after conversion thinning at the tree level using relative growth rate as a function of the initial diameter of individuals, stand density and time. Twenty years later, thinned treatments still yielded larger growth than the reference unthinned aged coppice. In the first 10-year period, the relative growth rate in all treatments decreased with increasing tree size. In the second 10-year period, the relative growth rate still decreased with increasing tree size in thinned treatments, whereas in the unthinned aged coppice, it increased with increasing tree size. The model we applied shows to what extent released individuals have grown in relation to their size and, at same time, provides information on their competitive state in relation to the overall density of stands over time.
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高林改造下老土耳其栎林的生长分析
大多数意大利关于森林转换的研究分析了林分水平上的生长响应,并采用绝对生长作为参考指标。然而,当平均林分水平的树级信息时,个体间的相互作用丢失了。此外,绝对生长忽略了被比较个体的初始大小,因此大树的生长总是优于小树,因此无法推断出树与树之间的竞争。我们利用相对生长率作为个体初始直径、林分密度和时间的函数,在树水平上模拟了转换间伐后的生长响应。二十年后,疏林处理仍比未疏林的参照物生长更大。在前10年,各处理的相对生长率均随树高的增加而降低。在第二个10年期间,疏林处理的相对生长率仍随乔木的增加而降低,而未疏林处理的相对生长率则随乔木的增加而增加。我们应用的模型显示了释放的个体相对于其大小的增长程度,同时,提供了与一段时间内林分总体密度相关的竞争状态的信息。
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来源期刊
Annals of Silvicultural Research
Annals of Silvicultural Research Agricultural and Biological Sciences-Forestry
CiteScore
2.70
自引率
0.00%
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0
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