Stable reverse J-shaped diameter distribution occurs in an old-growth karst forest

IF 3.4 2区 农林科学 Q1 FORESTRY
Yuanfa Li, Jie Li, Liting Wei
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Abstract

The reverse J-shaped diameter distribution is considered an inherent attribute of natural forests, crucial for forest resource utilization and community stability. However, in karst regions, intense habitat heterogeneity might alter species composition, spatial distribution, growth, biomass allocation, and mortality processes, yet its impact on diameter structure remains unclear. A fixed plot of 200 m × 110 m was established in the Nanpan River Basin, Southwest China, within an old-growth oak forest (> 300 years old), and the influence of site substrates (i.e., rock and soil), topographic factors, sample area, and orientation on diameter distribution was analyzed. Trees on both rock and soil exhibited a reverse-J shape, quantifiable through the Weibull function. The substrates had a similar density, approximately 2100 plants/ha. However, the average and range of diameter of trees on rock were smaller than those on soil, suggesting that rock constrains tree growth. The diameter distribution of trees across microtopography also displayed a reverse-J shape. Yet, higher elevations and sunny slopes showed a greater curvature of diameter classes compared to lower elevations and shady slopes, indicating habitat preferences in karst trees. Sample area and orientation had minimal effects on diameter class curve that reached stability when the plot size was 6000 m2. These results suggest that the reverse J-shaped diameter distribution prevails at small scales in karst old-growth forests, encompassing multiple curvatures and spanning forest ecosystems.

Abstract Image

古老的喀斯特森林出现稳定的反向 "J "形直径分布
反向 "J "形直径分布被认为是天然森林的固有属性,对森林资源利用和群落稳定至关重要。然而,在喀斯特地区,强烈的生境异质性可能会改变物种组成、空间分布、生长、生物量分配和死亡过程,但其对直径结构的影响仍不清楚。研究人员在中国西南南盘江流域的一片古老橡树林(树龄300年)中建立了一个200米×110米的固定小区,分析了场地基质(即岩石和土壤)、地形因素、样本面积和方向对直径分布的影响。岩石和土壤上的树木都呈现出反J形,可以通过威布尔函数进行量化。基质上的树木密度相似,约为 2100 株/公顷。然而,岩石上树木的平均直径和直径范围都小于土壤上的树木,这表明岩石限制了树木的生长。树木直径在不同微地形上的分布也呈现出反 "J "形。然而,与低海拔地区和阴坡相比,高海拔地区和阳坡上的树木直径等级的弯曲度更大,这表明喀斯特树木对栖息地的偏好。取样面积和取向对直径等级曲线的影响很小,当小区面积为 6000 平方米时,直径等级曲线趋于稳定。这些结果表明,在喀斯特古老森林中,小尺度的反向 J 形直径分布普遍存在,包括多个曲率,跨越森林生态系统。
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来源期刊
CiteScore
7.30
自引率
3.30%
发文量
2538
期刊介绍: The Journal of Forestry Research (JFR), founded in 1990, is a peer-reviewed quarterly journal in English. JFR has rapidly emerged as an international journal published by Northeast Forestry University and Ecological Society of China in collaboration with Springer Verlag. The journal publishes scientific articles related to forestry for a broad range of international scientists, forest managers and practitioners.The scope of the journal covers the following five thematic categories and 20 subjects: Basic Science of Forestry, Forest biometrics, Forest soils, Forest hydrology, Tree physiology, Forest biomass, carbon, and bioenergy, Forest biotechnology and molecular biology, Forest Ecology, Forest ecology, Forest ecological services, Restoration ecology, Forest adaptation to climate change, Wildlife ecology and management, Silviculture and Forest Management, Forest genetics and tree breeding, Silviculture, Forest RS, GIS, and modeling, Forest management, Forest Protection, Forest entomology and pathology, Forest fire, Forest resources conservation, Forest health monitoring and assessment, Wood Science and Technology, Wood Science and Technology.
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