Stand structure and climate influence on the growth trends of a marginal forest population of Pinus nigra spp. nigra

M. Marchi, Cristiano Castaldi, P. Merlini, S. Nocentini, F. Ducci
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引用次数: 9

Abstract

The Black pine of Villetta Barrea (Pinus nigra ssp. nigra var italica) is a variety of the nigra subspecies. It is naturally distributed only in the Abruzzo Region, near the village of Villetta Barrea, with a rear-edge Marginal Population. A dendrochrono- logical sampling of the population was implemented with the aim of studying its stand structure and the most probable interactions between growth trends and climate. Mensurational data were used to characterize the stand and, furthermore, the general correlation function (CF) and the moving correlation function (MCF), with a 30 years window, were used to assess the interrelation between the growth of the tree rings and the climate.The results indicated that the past forest management, mainly carried out with thinnings from below and selective cuttings, influenced the current structure of the forest (mean diameter) but no differences in growth trends were detected within the population. The survey on Villetta Barrea Black pine showed a positive and statistically significant correla- tion between the ring-width and the average temperatures of the months of December (before the ring formation - t-1), February and March; but it also showed a negative correlation with the temperatures of July, September and October of the current year (t). Moreover, the analysis with moving correlation functions suggested that, in the last decades, the population has negatively reacted to very few climate factors and, in particular, to the changes in temperatures (both minimum and maximum temperatures). This is especially true for the shifts occurred in September, the year of the ring formation.
林分结构和气候对黑松边缘林种群生长趋势的影响
维勒塔巴雷亚的黑松(Pinus nigra ssp.)。黑衣人(Nigra var italica)是黑衣人亚种的变种。它自然地只分布在Abruzzo地区,靠近Villetta Barrea村,具有后边缘边缘人口。为了研究其林分结构和生长趋势与气候之间最可能的相互作用,对种群进行了年代学采样。利用实测资料对林分进行表征,并利用一般相关函数(CF)和30年窗的移动相关函数(MCF)来评价年轮生长与气候的相互关系。结果表明,过去的森林管理主要以从下疏伐和选择性扦插为主,影响了目前的森林结构(平均直径),但种群内的生长趋势没有变化。调查结果表明,12月(环形成前)、2月和3月的平均气温与环宽呈显著正相关;但与当年7月、9月和10月(t)的温度也呈负相关。此外,移动相关函数分析表明,近几十年来,人口对少数气候因子,特别是对温度(最低和最高温度)变化的负反应。这对于发生在九月的变化尤其如此,那一年是土星环形成的年份。
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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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