Land tenure and human disturbance influence the current distribution of aboveground biomass in Sri Lankan rainforest fragments

IF 3.7 2区 农林科学 Q1 FORESTRY
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Abstract

This study examines the landscape distribution of aboveground biomass (AGB) in fragmented tropical rainforests in Sri Lanka. While most attribute AGB losses from fragmentation to abiotic edge effects (e.g., desiccation and wind), land tenure and human disturbance also play a significant role. In South Asia, forest fragments are essential food, medicine, and wood sources for large rural populations. Despite this, few studies have addressed AGB dynamics in smallholder landscapes with a long land clearance and cultivation history. This study explored three objectives: (a) assessing the accuracy of a common allometric height-diameter model, (b) comparing AGB stocks in forest fragments to primary forests, and (c) examining the influence of land tenure, abiotic edge effects, and human disturbance on AGB distribution. We estimated AGB using field-based measurements in 18 forest fragments and two primary forest sites and employed mixed effects models to explore the landscape distribution of AGB. The allometric height-diameter model overestimated fragment tree heights compared to measured heights, leading to an overestimation of AGB by 25 %. AGB stocks were significantly lower in fragmented forests (259.9 Mg ha−1) than in primary forests (434.5 Mg ha−1), and there was no significant correlation between plot AGB and variables associated with abiotic edge effects (i.e., distance-to-edge, fragment size, isolation). However, AGB positively correlated with factors related to decreased accessibility and local land ownership. These findings suggest that land tenure and human disturbance strongly influence the current AGB distribution in Sri Lankan rainforest fragments, emphasizing the need to understand human impacts for effective conservation and management.

土地使用权和人为干扰影响斯里兰卡热带雨林片区目前的地上生物量分布
本研究考察了斯里兰卡破碎热带雨林中地上生物量(AGB)的景观分布。虽然大多数人将破碎化造成的地上生物量损失归因于非生物边缘效应(如干燥和风),但土地保有权和人为干扰也发挥了重要作用。在南亚,森林破碎带是大量农村人口不可或缺的食物、药品和木材来源。尽管如此,很少有研究探讨土地清理和耕种历史悠久的小农地貌中的 AGB 动态。本研究探讨了三个目标:(a) 评估常见的等比线高度-直径模型的准确性;(b) 比较森林破碎带和原始森林中的 AGB 储量;(c) 检验土地保有权、非生物边缘效应和人为干扰对 AGB 分布的影响。我们在 18 个森林片区和两个原始森林地点进行了实地测量,估算了 AGB,并采用混合效应模型探讨了 AGB 的景观分布。与测量高度相比,高度-直径异速模型高估了片段树木的高度,导致 AGB 被高估了 25%。片断森林的 AGB 储量(259.9 兆克/公顷-1)明显低于原始森林(434.5 兆克/公顷-1),地块 AGB 与非生物边缘效应相关变量(即边缘距离、片断大小、隔离度)之间没有明显的相关性。然而,AGB 与交通不便和当地土地所有权相关因素呈正相关。这些研究结果表明,土地保有权和人为干扰对斯里兰卡雨林片区目前的 AGB 分布有很大影响,这强调了了解人为影响以进行有效保护和管理的必要性。
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来源期刊
Forest Ecology and Management
Forest Ecology and Management 农林科学-林学
CiteScore
7.50
自引率
10.80%
发文量
665
审稿时长
39 days
期刊介绍: Forest Ecology and Management publishes scientific articles linking forest ecology with forest management, focusing on the application of biological, ecological and social knowledge to the management and conservation of plantations and natural forests. The scope of the journal includes all forest ecosystems of the world. A peer-review process ensures the quality and international interest of the manuscripts accepted for publication. The journal encourages communication between scientists in disparate fields who share a common interest in ecology and forest management, bridging the gap between research workers and forest managers. We encourage submission of papers that will have the strongest interest and value to the Journal''s international readership. Some key features of papers with strong interest include: 1. Clear connections between the ecology and management of forests; 2. Novel ideas or approaches to important challenges in forest ecology and management; 3. Studies that address a population of interest beyond the scale of single research sites, Three key points in the design of forest experiments, Forest Ecology and Management 255 (2008) 2022-2023); 4. Review Articles on timely, important topics. Authors are welcome to contact one of the editors to discuss the suitability of a potential review manuscript. The Journal encourages proposals for special issues examining important areas of forest ecology and management. Potential guest editors should contact any of the Editors to begin discussions about topics, potential papers, and other details.
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