多花蔷薇灌木入侵森林的土壤氮循环:土壤湿度和入侵密度的重要性

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Biogeochemistry Pub Date : 2024-03-23 DOI:10.1007/s10533-024-01133-3
Eric R. Moore, Richard V. Pouyat, Tara L. E. Trammell
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引用次数: 0

摘要

摘要 入侵植物通常会改变生态系统的功能和过程,尤其是土壤氮循环。在美国东部森林中,灌木多花蔷薇("蔷薇")是一种主要入侵植物,但人们对其对氮循环的潜在影响知之甚少。此外,入侵植物管理会降低植物对氮的吸收并扰乱土壤,从而影响土壤氮循环。本研究的目的是评估沿玫瑰入侵梯度的氮循环(观察),并调查在以下四种不同管理策略下氮循环的潜在变化(操作):(1)不采取任何措施(对照);(2)移除入侵植物;(3)移除后添加原生混合种子;(4)移除、添加原生混合种子和碎玫瑰茎。我们选择了三处灌木入侵程度较低、中等或较高的林地,并测量了生长季节初期(6 月)和后期(9 月)的氮循环情况。我们发现氮在六月被固定,在九月被矿化。实验管理一年后,与对照地块相比,单独移除灌木对氮循环没有影响,但在中度入侵地块,添加本地混合种子和碎茎可减少早季硝化。我们的研究结果表明,当土壤干燥时,玫瑰入侵可能会提高氮循环率,而随着未来气候变化,这种情况可能会更加频繁。此外,在移除入侵植物后的一年里,氮循环对管理的反应各不相同,但在中度玫瑰入侵的情况下最为明显。
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Soil nitrogen cycling in forests invaded by the shrub Rosa multiflora: importance of soil moisture and invasion density

Invasive plants often alter ecosystem function and processes, especially soil N cycling. In eastern United States forests, the shrub Rosa multiflora (“rose”) is a dominant invader, yet potential effects on N cycling are poorly understood. Moreover, invasive plant management can impact soil N cycling by decreasing plant N uptake and disturbing the soil. The objectives of this study were to evaluate N cycling along a gradient of rose invasion (observational) and investigate potential changes to N cycling (manipulative) under four different management strategies: (1) do nothing (the control), (2) invasive plant removal, (3) removal followed by native seed mix addition, (4) removal, native seed mix, and chipped rose stem addition. We selected three forest sites experiencing a Low, Medium, or High amount of shrub invasion, and measured N cycling in the early (June) and late (September) growing seasons. We found N was immobilized in June and mineralized in September. One year after experimental management, removal alone had no effect on N cycling compared to control plots, but addition of native seed mix and chipped stems reduced early-season nitrification in our Medium invasion site. Our findings suggest that rose invasion may increase N cycling rates when soils are dry, which may occur more frequently with future climate change. In addition, N cycling responds differentially to management in the year following invasive plant removal, but most noticeably under moderate rose invasion.

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来源期刊
Biogeochemistry
Biogeochemistry 环境科学-地球科学综合
CiteScore
7.10
自引率
5.00%
发文量
112
审稿时长
3.2 months
期刊介绍: Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.
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