Interactive effects of climate warming and management on grassland soil respiration partitioning

IF 4 2区 农林科学 Q2 SOIL SCIENCE
Arlete S. Barneze, Jeanette Whitaker, Niall P. McNamara, Nicholas J. Ostle
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引用次数: 0

Abstract

Grassland ecosystems are important for the provision of food, fuel and fibre. They represent globally important carbon (C) reservoirs that are under pressure from intensive management and ongoing climate change. How these drivers of change will interact to affect grassland soil C and nitrogen (N) cycling and heterotrophic and autotrophic respiration remains uncertain. Roots and mycelia in grassland soil are important regulators of ecosystem functioning and likely to be an influential determinant of CO2 fluxes responses to global change. The aim of this study was to investigate the interactive effect of climate warming and grassland management on soil respiration originating from roots rhizosphere, mycelia and free-living microbes. The experiment used a block design to measure the interactive effects of warming, nitrogen addition, aboveground biomass (AGB) removal on belowground respiration in a temperate grassland ecosystem. An in-growth core method using cores with different mesh sizes was used to partition belowground respiration due to its simplicity of design and efficacy. We found that basal respiration (free-living microorganisms) was the highest (58.5% of the total emissions), followed by that from roots (22.8%) and mycelia (18.7%) across all treatments. Warming reduced basal respiration whilst AGB removal increased it. An antagonistic interaction between warming and nitrogen addition reduced root respiration, and a three-way interaction between warming, nitrogen addition and AGB removal affected mycelial respiration. The results show different contributions of belowground biota to soil respiration, and how interactions between climate change and grassland management may influence effects on soil respiration.

Abstract Image

气候变暖和管理对草地土壤呼吸分配的交互影响
草地生态系统对于提供食物、燃料和纤维十分重要。它们是全球重要的碳(C)库,正受到集约化管理和持续气候变化的压力。这些变化的驱动因素将如何相互作用以影响草地土壤的碳和氮循环以及异养和自养呼吸仍不确定。草地土壤中的根和菌丝体是生态系统功能的重要调节器,很可能成为二氧化碳通量对全球变化响应的一个有影响力的决定因素。本研究旨在探讨气候变暖和草地管理对来自根系根圈、菌丝体和自由生活微生物的土壤呼吸作用的交互影响。实验采用区组设计,测量气候变暖、氮添加、地上生物量(AGB)去除对温带草地生态系统地下呼吸作用的交互影响。由于设计简单、效果显著,我们采用了使用不同网孔大小的生长核心方法来划分地下呼吸。我们发现,在所有处理中,基础呼吸(自由生活的微生物)最高(占总排放量的 58.5%),其次是根部呼吸(22.8%)和菌丝体呼吸(18.7%)。升温降低了基础呼吸作用,而去除 AGB 增加了基础呼吸作用。升温与氮添加之间的拮抗作用降低了根呼吸作用,而升温、氮添加和 AGB 清除之间的三方作用影响了菌丝呼吸作用。研究结果表明,地下生物群对土壤呼吸的贡献各不相同,气候变化与草地管理之间的相互作用可能会影响对土壤呼吸的影响。
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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来源期刊
European Journal of Soil Science
European Journal of Soil Science 农林科学-土壤科学
CiteScore
8.20
自引率
4.80%
发文量
117
审稿时长
5 months
期刊介绍: The EJSS is an international journal that publishes outstanding papers in soil science that advance the theoretical and mechanistic understanding of physical, chemical and biological processes and their interactions in soils acting from molecular to continental scales in natural and managed environments.
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