Changes in soil arthropods and litter nutrients after prescribed burn in a subtropical moist pastureland

IF 2 3区农林科学 Q3 ECOLOGY

Pedobiologia Pub Date : 2024-09-01 DOI:10.1016/j.pedobi.2024.150990

Wei Huang , Grizelle González , María Fernanda Barberena-Arias , Weili Liu , Xiaoming Zou

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引用次数: 0

Abstract

Plant litter decomposition is driven by soil biota and biophysiochemical conditions as well as substrate quality. Prescribed burns can affect the abundance and diversity of soil arthropods and the biophysiochemical conditions in terrestrial ecosystems. In this study, we examined the effects of a prescribed burn on soil arthropods and litter chemistry in decomposing litter during a total of 469-days field incubation using litter from two grasses, Dichanthium annulatum and Megathyrsus maximus, in a subtropical moist pastureland of Puerto Rico. We found the prescribed burn substantially elevated ultraviolet (UV) radiation and soil temperature; and significantly decreased the diversity of litter total arthropods, especially predators and Mesostigmata mites, during the initial 5 months after the burn. However, the prescribed burn had no effect on either the biophysical environment nor on arthropod abundance and diversity during the subsequent incubation period of >5 months after the burn. Furthermore, the prescribed burn substantially increased the immobilization of iron (Fe) and manganese (Mn), and decreased sulfur (S) concentration in the decomposing litter. Prescribed burn had no interactions with substrate quality for percent mass remaining (PMR) and elemental release or accumulation. Low substrate quality D. annulatum litter with a carbon to phosphorus (C/P) ratio of 614 was associated with higher microbivore diversity and higher predator density than higher substrate quality M. maximus litter with a C/P ratio of 266 during the entire incubation period. Lower initial concentration of litter P, magnesium (Mg) and calcium (Ca) in D. annulatum resulted in higher immobilization of these elements in decomposing litter than in M. maximus. Our study suggest that prescribed burn can impose short-term changes in biophysiochemical conditions and the diversity of arthropods in litter decomposition during the initial recovery period of about 5 months after a burn, thus highlighting a high resilience of the grassland ecosystem to fire disturbance, and that it can bring lasting changes in the cycling of Fe, Mn, and S in subtropical moist pastureland that can alter ecosystem productivity.

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亚热带湿润牧场烧荒后土壤节肢动物和枯落物养分的变化

植物废弃物的分解受土壤生物区系和生物生理化学条件以及基质质量的影响。烧荒会影响土壤节肢动物的数量和多样性以及陆地生态系统的生物生理生化条件。在这项研究中，我们利用波多黎各亚热带湿润牧场中的两种禾本科植物 Dichanthium annulatum 和 Megathyrsus maximus 的枯落物，在长达 469 天的野外培养过程中，考察了烧荒对土壤节肢动物和枯落物分解化学的影响。我们发现，在焚烧后的最初 5 个月中，焚烧大大增加了紫外线辐射和土壤温度，并显著降低了枯落物中节肢动物的多样性，尤其是捕食者和中生螨。然而，在焚烧后 5 个月的潜伏期内，焚烧对生物物理环境以及节肢动物的数量和多样性都没有影响。此外，焚烧大大提高了铁（Fe）和锰（Mn）的固定化程度，并降低了腐烂垃圾中硫（S）的浓度。在剩余质量百分比（PMR）和元素释放或积累方面，烧荒与基质质量没有相互作用。在整个孵化期间，碳磷（C/P）比为 614 的低基质质量 D. annulatum 枯落物与碳磷（C/P）比为 266 的高基质质量 M. maximus 枯落物相比，具有更高的微型食草动物多样性和更高的捕食者密度。D. annulatum的枯落物P、镁（Mg）和钙（Ca）初始浓度较低，导致这些元素在腐烂的枯落物中的固定化程度高于M. maximus。我们的研究表明，在烧伤后约 5 个月的初期恢复期内，烧伤可在短期内改变生物生理生化条件和枯落物分解过程中节肢动物的多样性，从而凸显草原生态系统对火灾干扰的高恢复力，而且烧伤可使亚热带湿润牧场中铁、锰和硒的循环发生持久变化，从而改变生态系统的生产力。

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来源期刊

Pedobiologia 环境科学-生态学

CiteScore

4.20

自引率

8.70%

发文量

审稿时长

64 days

期刊介绍： Pedobiologia publishes peer reviewed articles describing original work in the field of soil ecology, which includes the study of soil organisms and their interactions with factors in their biotic and abiotic environments. Analysis of biological structures, interactions, functions, and processes in soil is fundamental for understanding the dynamical nature of terrestrial ecosystems, a prerequisite for appropriate soil management. The scope of this journal consists of fundamental and applied aspects of soil ecology; key focal points include interactions among organisms in soil, organismal controls on soil processes, causes and consequences of soil biodiversity, and aboveground-belowground interactions. We publish: original research that tests clearly defined hypotheses addressing topics of current interest in soil ecology (including studies demonstrating nonsignificant effects); descriptions of novel methodological approaches, or evaluations of current approaches, that address a clear need in soil ecology research; innovative syntheses of the soil ecology literature, including metaanalyses, topical in depth reviews and short opinion/perspective pieces, and descriptions of original conceptual frameworks; and short notes reporting novel observations of ecological significance.