Pelissari Allan L, F Filho Afonso, Ebling Angelo A, Sanquetta Carlos R, Cysneiros Vinicius C, Corte Ana Paula D
Departamento de Ciências Florestais, Universidade Federal do Paraná / UFPR, Av. Prof. Lothário Meissner, 632, 80210-170 Curitiba, PR, Brazil.
Departamento de Engenharia Florestal, Universidade Estadual do Centro-Oeste / UNICENTRO, PR 153, Km 7, 84500-000 Irati, PR, Brazil.
An Acad Bras Cienc. 2018 Aug;90(2 suppl 1):2491-2500. doi: 10.1590/0001-3765201820170826.
Floristic surveys and diversity indices are often applied to measure tree species diversity in mixed tropical forest remnants. However, these analyses are frequently limited to the overall results and do not allow to evaluate the spatial variability distributions of tree diversity, leading to develop additional tools. This study aimed to estimate the spatial variability of tree diversity and map their spatial patterns in a Brazilian mixed tropical forest conservation area. We used indices to measure the tree species diversity (dbh ≥ 10 cm) in 400 sampling units (25 m x 25 m) from a continuous forest inventory. Semivariograms were fitted to estimate spatial dependences and punctual kriging was applied to compose maps. Mean diversity values were constant in the continuous inventories, indicating a forest remnant in an advanced stage of ecological succession. On the other hand, tree diversity presented spatial patterns identified by geostatistics, in which the dynamics were composed of heterogeneous mosaics spatially influenced by tree species with different ecological features and densities, gap dynamics, advancement of forest succession, mortality, and Araucaria angustilofia's cohorts.
植物区系调查和多样性指数常被用于衡量热带混交林残余地的树种多样性。然而，这些分析往往局限于总体结果，无法评估树木多样性的空间变异分布，因此需要开发额外的工具。本研究旨在估计巴西热带混交林保护区树木多样性的空间变异性，并绘制其空间格局图。我们使用指数来衡量来自连续森林清查的400个采样单元（25米×25米）中胸径≥10厘米的树种多样性。拟合半变异函数以估计空间依赖性，并应用点克里金法绘制地图。连续清查中的平均多样性值是恒定的，表明该森林残余地处于生态演替的高级阶段。另一方面，树木多样性呈现出由地统计学确定的空间格局，其动态由受具有不同生态特征和密度的树种、林窗动态、森林演替进程、死亡率以及南洋杉种群在空间上影响的异质镶嵌体组成。
