野牛和牛的放牧增加了高草草原生态系统的土壤氮循环

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Nicholas Vega Anguiano, Kiona M. Freeman, Janaye D. Figge, Jaide H. Hawkins, Lydia H. Zeglin
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引用次数: 0

摘要

氮(N)是土壤肥力的必要元素,也是高草草原的一种限制性养分,但野牛和牛等食草动物也可以循环利用氮。野牛和牛通过消化消耗掉的草料影响氮(N)循环,并以更多的形式循环回土壤,刺激土壤微生物的氮循环活动。然而,我们并不知道这两种食草动物是如何对高草草原的氮循环产生相对影响的。因此,我们在康萨草原生物站进行了为期 3 年(2020-2022 年)的调查,研究野牛和牛是否对每年焚烧的高草草原的氮循环产生了类似于未放牧条件下的影响。我们研究了:土壤 pH 值、土壤含水量、矿化氮、硝化潜力、反硝化潜力和细胞外酶测定。降水量的年际变化控制着土壤水分和氮循环微生物活动,但放牧效应对氮循环的影响更大。我们发现,野牛放牧的土壤与牛放牧的土壤在土壤 pH 值、硝化和反硝化潜力以及氮限制方面存在明显差异,且野牛放牧的土壤氮循环速度更快。放牧者之间的差异可能归因于对野牛和牛的不同管理,因为两者都会影响氮循环。总之,这些数据提供了一些证据,证明野牛和牛对该研究地点的氮循环有不同的影响,并提高了生态学对高草草原生态系统中放牧者对氮循环动态影响的认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Bison and cattle grazing increase soil nitrogen cycling in a tallgrass prairie ecosystem

Bison and cattle grazing increase soil nitrogen cycling in a tallgrass prairie ecosystem

Nitrogen (N) is a necessary element of soil fertility and a limiting nutrient in tallgrass prairie but grazers like bison and cattle can also recycle N. Bison and cattle impact the nitrogen (N) cycle by digesting forage that is consumed, and recycled back to the soil in a more available forms stimulating soil microbial N cycling activities. Yet we do not know how both grazers comparatively affect N cycling in tallgrass prairie. Thus, we investigated if bison and cattle had similar impacts on N cycling in annually burned tallgrass prairie relative to ungrazed conditions over a 3-year period (2020–2022) at the Konza Prairie Biological Station. We examined: soil pH, soil water content, mineralized N, nitrification potential, denitrification potential and extracellular enzyme assays. Interannual variability in precipitation controlled soil water and N cycling microbial activities but grazing effects had a stronger influence on N cycling. We found significant differences and increased soil pH, nitrification and denitrification potential and less N limitation in bison vs cattle grazed soils where bison grazed soils exhibited faster N cycling. Differences between the grazers may be attributed to the different management of bison and cattle as both can impact N cycling. Overall, these data provide some evidence that bison and cattle affect N cycling differently at this study site, and improve the ecological understanding of grazer impacts on N cycling dynamics within the tallgrass prairie ecosystem.

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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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