Arboreal Vegetation Dynamics in an Anthropized Montane Araucaria Forest

ABSTRACT Changes in floristic composition, phytosociological structure and dynamic processes like ingrowth, mortality and diameter increment were studied between 2007 and 2009 in all trees with DBH ≥ 5 cm in a fragment of Montane Araucaria Forest in Boa Ventura do São Roque, Paraná, Brazil. The analyses showed the occurrence 2596 ind.ha-1, 25 families, 40 genera and 45 species, while in the survey conducted in 2009, 2558 indivuals.ha-1, 27 families, 41 genera and 47 species were registered, with Matayba elaeagnoides Radlk. being the most important species in both surveys. The forest fragment showed a mortality rate of 0.41% per year and recruitment of 1.75% per year. This indicates that the dynamics take place in a gradual manner, with a mean annual increment (MAI) of 0.328 cm.year-1. Based on the evaluated parameters, it follows that the fragment is in process of regeneration.摘要 本研究于2007—2009年间，对巴西巴拉那州圣罗克博阿文图拉境内一处山地南洋杉林片段内胸径（DBH）≥5厘米的全部林木，就其植物区系组成、植物群落结构以及径级补充、个体死亡与直径生长等动态过程展开了研究。分析结果显示：2007年调查共记录到2596株·公顷⁻¹、25个科、40个属及45个物种；2009年调查则记录到2558株·公顷⁻¹、27个科、41个属及47个物种，其中Matayba elaeagnoides Radlk.为两次调查中的优势物种。该林分片段的年死亡率为0.41%，年补充更新率为1.75%，表明其森林动态过程呈渐进式发展，年均直径生长量（MAI）为0.328厘米·年⁻¹。基于上述评估参数可知，该林分片段正处于更新恢复进程中。