城市化对俄罗斯北极地区冬季土壤呼吸作用的影响

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES Journal of Soils and Sediments Pub Date : 2024-08-27 DOI:10.1007/s11368-024-03885-9
Natalya Saltan, Viacheslav Vasenev, Maria Korneykova, Marina Slukovskaya, Marina Zavodskikh, Dmitrii Sarzhanov
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引用次数: 0

摘要

目的随着全球持续变暖,北极生态系统的碳(C)平衡已成为一个 "热门 "话题;然而,北极城市土壤中的碳储量和碳通量仍被忽视。材料与方法从 2020 年 11 月到 2023 年 5 月,在两个城市(UR)地点(UR1 位于镇中心,UR2 位于镇郊区)观测了土壤呼吸和微气候参数(即气温、0 厘米、7 厘米和 20 厘米处的土壤温度以及积雪高度),并与自然林区进行了对比。分析了土壤化学(即容重、pHw、可利用磷含量、总碳、总氮、铜和镍的大量含量)和微生物(即 Cmic、BR、qCO2、rRNA 基因拷贝数和群落级生理特征)特性,以解释土壤呼吸的模式。冬季和积雪期的呼吸作用分别占土壤二氧化碳年累积排出量的 20% 和 50%,解冻期的呼吸作用显著增加。结论:要充分估计北极城市的土壤二氧化碳平衡,必须将冬季土壤呼吸作用视为累积年二氧化碳流出量的重要组成部分,而城市内的监测点则代表了由城市热岛效应以及城市土壤的年龄和管理所导致的中间气候条件的梯度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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The effect of urbanisation on wintertime soil respiration in the Russian Arctic

Purpose

With ongoing global warming, the carbon (C) balance of Arctic ecosystems has become a ‘hot’ topic; however, C stocks and fluxes in the soil of Arctic cities remain overlooked. The research aimed to estimate wintertime soil respiration and its contribution to the cumulative annual CO2 emission from urban and natural soil of Apatity town in the Russian Arctic zone.

Materials and methods

Soil respiration and microclimatic parameters (i.e., air temperature, soil temperature at 0 cm, 7 cm and 20 cm, and snow height) were observed from November 2020 until May 2023 at two urban (UR) sites (UR1 was in the town centre, and UR2 was in the town’s outskirts) in comparison to the natural forested area. Soil chemical (i.e., bulk density, pHw, contents of available P, total C, N, bulk contents of Cu and Ni) and microbial (i.e., Cmic, BR, qCO2, number of rRNA gene copies and community-level physiological profile) properties were analysed to explain patterns in soil respiration.

Results

A thicker snow layer and warmer soil temperature at the urban sites determined a higher than at the natural site cumulative annual soil CO2 efflux. The wintertime and snowy-period respiration accounted for 20% and 50% of the cumulative annual soil CO2 efflux, respectively, with remarkable spikes during the thawing period. The high variation in soil respiration between urban sites was explained by different states of microbial communities, with higher activity shown for younger and more intensively managed soil at the UR2 site.

Conclusion

An adequate estimate of soil C balance in Arctic cities must consider the wintertime soil respiration as an essential part of the cumulative annual CO2 efflux, whereas monitoring points inside the cities represent the gradient in mesoclimatic conditions driven by the urban heat island effect as well as the age and management of urban soils.

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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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