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在亚马逊中部,六种人工林树种的空间分布受到地形条件的影响。

Spatial distribution of six managed tree species is influenced by topography conditions in the Central Amazon.

机构信息

Graduate Program in Tropical Forest Science, National Institute of Amazon Researches (INPA), André Araújo Avenue, 2936, Petrópolis, Post Code - 69060-001, Manaus, AM, Brazil.

Graduate Program of Forest Science, Institute of Agrarian Sciences, Amazon Rural Federal University (ICA/UFRA), Presidente Tancredo Neves Avenue, 2501, Terra Firme, Post Code- 66.077-830, Belém, PA, Brazil.

出版信息

J Environ Manage. 2021 Mar 1;281:111835. doi: 10.1016/j.jenvman.2020.111835. Epub 2020 Dec 31.

Abstract

In tropical forests, the spatial distribution of trees may present random, uniform, or grouped patterns that can simultaneously be affected by site and species characteristics. In Central Amazon, topographic gradients and soil water levels drive differences in tree species distribution and in forest dynamics at local scales. Knowing this kind of information can be useful for a forest manager to plan harvesting operations considering the microhabitat preference of merchantable species to reduce the disturbances caused by logging activities. Thus, the spatial variation of tree species is an important information to be considered to support the planning process of forest logging. The present study aims to evaluate the spatial distribution pattern of six species and analyze the relationship between the topography and the population densities and stem size of those species. The study was carried out in a forest production compartment managed by a private company located in the municipality of Silves, state of Amazonas, Brazil. The spatial pattern of the six species was characterized by Ripley's K function. Spatial distribution of diameter at breast height (DBH) and tree density based on kernel incidence calculation were evaluated for topographic classes of slope, elevation, and distance from streams, which were mapped using geographic information systems (GIS). The means of DBH and density of each species were compared among topographic classes by ANOVA and Tukey's test. The results demonstrated the predominance of the aggregate distribution pattern for the six species up to 1105 m (p < 0.01). The tree species Minquartia guianensis Aubl., Protium puncticulatum J.F.Macbr, Manilkara elata (Allemão ex Miq.) Monach, and Caryocar glabrum Aubl. Pers showed an increase in the tree density as the distance from the streams and elevation increased, standing spatially incident on plateaus. Kernel densities of Dinizia excelsa Ducke and Goupia glabra Aubl. were higher closer to streams. The DBH averages followed similar trends of population density for M. guianensis, M. elata, and C. glabrum, and the opposite pattern for D. excelsa, which presented larger individuals in less densely populated areas. P. puncticulatum and G. glabra mean DBH distribution was not affected by the topographic variables analyzed. Topography-related variables showed effects on variations of density and tree size, suggesting that species may be spatially sensitive to the habitat variability available in the study area. In view of logging planning, spatial distribution must be considered in decisions related to cutting down trees and maintenance of remaining trees, especially because some species are more aggregated in smaller scales. Moreover, as topographic variations affect the spatial distribution of size and density, the timber yield will vary spatially in the area, bringing implications for planning logging intensities, roads, skid trails and forest operations. Finally, the procedures and information generated in this study can be reproduced and applied to other species and managed areas to support the planning toward minimizing impacts on the spatial structure of commercial species, as well as to increase the chances of future stock recovery of managed forests in the Amazon.

摘要

在热带森林中,树木的空间分布可能呈现随机、均匀或聚集的模式,这些模式同时可能受到地点和物种特征的影响。在中亚马逊地区,地形梯度和土壤水位差异导致了树种分布和局部尺度上森林动态的差异。了解这种信息对于森林管理者来说可能很有用,因为可以考虑到商品树种对小生境的偏好来规划采伐作业,以减少伐木活动造成的干扰。因此,树种的空间变化是支持森林采伐规划过程的重要信息。本研究旨在评估六种物种的空间分布模式,并分析地形与这些物种的种群密度和茎干大小之间的关系。该研究在巴西亚马逊州西尔韦斯市的一家私营公司管理的森林生产小区内进行。利用 Ripley 的 K 函数对六种物种的空间格局进行了特征描述。利用地理信息系统(GIS)绘制坡度、海拔和溪流距离的地形类别图,对胸径(DBH)和基于核密度计算的树木密度的空间分布进行了评估。通过方差分析和 Tukey 检验比较了各物种在地形类别中的 DBH 和密度平均值。结果表明,在 1105 米以内,六种物种的聚集分布模式占主导地位(p < 0.01)。Minquartia guianensis Aubl.、Protium puncticulatum J.F.Macbr.、Manilkara elata (Allemão ex Miq.) Monach.、Caryocar glabrum Aubl. Pers.等树种的树木密度随着与溪流的距离和海拔的增加而增加,在高原上呈空间聚集分布。Dinizia excelsa Ducke 和 Goupia glabra Aubl. 的核密度则更靠近溪流。M. guianensis、M. elata 和 C. glabrum 的 DBH 平均值遵循与种群密度相似的趋势,而 D. excelsa 的相反,其在人口密度较低的地区有更大的个体。P. puncticulatum 和 G. glabra 的平均 DBH 分布不受分析的地形变量的影响。与地形有关的变量对密度和树木大小的变化有影响,这表明物种可能对研究区域内可用栖息地的变化具有空间敏感性。从采伐规划的角度来看,在与砍伐树木和保留树木有关的决策中必须考虑空间分布,特别是因为一些物种在较小的尺度上更聚集。此外,由于地形变化会影响大小和密度的空间分布,该区域的木材产量将在空间上有所不同,这对规划采伐强度、道路、滑橇径迹和森林作业产生影响。最后,本研究中生成的程序和信息可以在其他物种和管理区域中复制和应用,以支持规划,尽量减少对商业物种空间结构的影响,并增加亚马逊地区管理森林未来蓄积量恢复的机会。

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