干扰会减缓垃圾的分解速度,这取决于干扰的严重程度和季节:乞力马扎罗山的一个例子

IF 2.3 3区 环境科学与生态学 Q2 ECOLOGY
Web Ecology Pub Date : 2024-02-23 DOI:10.5194/we-24-11-2024
Juliane Röder, Tim Appelhans, Marcell K. Peters, Thomas Nauss, Roland Brandl
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引用次数: 0

摘要

摘要森林砍伐和土地利用变化会影响生态系统的碳循环过程。在此,我们介绍了在坦桑尼亚乞力马扎罗山南坡海拔 3600 米处的六种自然植被类型和六种受干扰植被类型中进行的垃圾分解实验的结果。我们在两个季节分别将装有标准材料的垃圾袋暴露长达 12 周。在寒冷的雨季,我们对整个海拔梯度进行了采样;在温暖的雨季,我们在海拔梯度的下部重复了采样。虽然我们发现干扰对森林生态系统有明显的负面影响,但这仅仅是由于天然林和烧毁的波多巴森林之间的差异造成的。当我们对整个海拔梯度进行研究时,许多被研究的植被类型中以更开放的植被结构为特征的干扰没有普遍影响;这也包括非森林植被类型。土地使用强度对分解率有显著的负面影响,但只在暖湿季有影响,在冷湿季没有影响。在所有植被类型和季节的子集中,温度和湿度都是导致分解的最重要因素。我们的研究表明,干扰或土地利用强度对分解的负面影响取决于干扰的严重程度和季节。然而,气候通常是影响分解的最主要因素。因此,干扰程度适中的植被类型可以在短时间内保持较高的碳循环功能。为了更好地预测土地利用变化对非洲热带地区碳循环的影响,有必要进行更多和更长时间的分解研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Disturbance can slow down litter decomposition, depending on severity of disturbance and season: an example from Mount Kilimanjaro
Abstract. Deforestation and land-use change affect ecosystem processes such as carbon cycling. Here, we present results from a litter decomposition experiment in six natural and six disturbed vegetation types along an elevation gradient of 3600 m on the southern slopes of Mount Kilimanjaro, Tanzania. We exposed litter bags with a standard material for up to 12 weeks each in two seasons. In the cold wet season we sampled the full elevation gradient and in the warm wet season we repeated the sampling in the lower part of the elevation gradient. Though we found significantly negative effects of disturbance in forest ecosystems, this was only due to differences between natural and burned Podocarpus forests. Disturbance characterized by a more open vegetation structure in many of the studied vegetation types had no general effect when we studied the full elevation gradient; this also included non-forest vegetation types. Land-use intensity had a significant negative effect on decomposition rates but only in the warm wet season, not in the cold wet season. Temperature and humidity were the most important drivers of decomposition overall and for all subsets of vegetation types and seasons. Our study shows that negative effects of disturbance or land-use intensity on decomposition depended on the severity of disturbance and on the season. Nevertheless, climate was generally the most relevant driver of decomposition. Therefore, vegetation types with moderate levels of disturbance can retain high functionality in regards to carbon cycling over short periods of time. More and longer decomposition studies are necessary to better predict consequences of land-use change for carbon cycling in the Afrotropics.
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来源期刊
Web Ecology
Web Ecology Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics
CiteScore
4.60
自引率
0.00%
发文量
6
审稿时长
17 weeks
期刊介绍: Web Ecology (WE) is an open-access journal issued by the European Ecological Federation (EEF) representing the ecological societies within Europe and associated members. Its special value is to serve as a publication forum for national ecological societies that do not maintain their own society journal. Web Ecology publishes papers from all fields of ecology without any geographic restriction. It is a forum to communicate results of experimental, theoretical, and descriptive studies of general interest to an international audience. Original contributions, short communications, and reviews on ecological research on all kinds of organisms and ecosystems are welcome as well as papers that express emerging ideas and concepts with a sound scientific background.
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