Interactive effects of management and temperature anomalies on CO2 fluxes recorded over 18 years in a temperate upland grassland system

IF 5.6 1区 农林科学 Q1 AGRONOMY Agricultural and Forest Meteorology Pub Date : 2024-12-07 DOI:10.1016/j.agrformet.2024.110343
Bruna Winck, Katja Klumpp, Juliette M.G. Bloor
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Abstract

Temperature anomalies such as heat waves and cold spells are increasingly common, posing threats to ecosystem functioning and delivered services. Although temperature anomalies have been shown to limit broad-scale patterns of carbon sequestration, fine-scale studies on CO2 fluxes and temperature anomalies are limited and interactions between temperature anomalies and agricultural management remain poorly understood. Using long-term data on grassland CO2 fluxes and air temperature (2003-2021), we investigated the effects of temperature anomalies (cold, warm, extreme cold, extreme warm) on gross primary productivity and ecosystem respiration in adjacent upland mesic grasslands subjected to either extensive or intensive cattle grazing management treatments. Both warm and cold temperature anomalies occurred throughout the study period, with 40 days per year on average classed as colder or warmer compared to normal. Irrespective of management treatment and flux type, we found that temperature anomalies had a significant effect on the magnitude of CO2 fluxes, the relationship between air temperature and CO2 fluxes, and the occurrence of anomalous flux events. The magnitude of CO2 fluxes was most affected by temperature anomalies at the start of the growing season, and fluxes were generally more sensitive to warm rather than cold temperature anomalies. However, cold temperature anomalies promoted asynchrony between C uptake and loss. Temperature-CO2 flux relationships were upregulated by warm temperature anomalies in spring but down-regulated in summer and autumn, with greater reductions in flux process rates in the intensive management treatment. Nevertheless, temperature anomalies were not found to be a strong driver of flux anomalies in this study system. Collectively, our results show that grassland management interacts with the timing and nature of temperature anomalies on CO2 fluxes and suggest that low grassland management intensity may buffer CO2 fluxes against warm air temperature anomalies in cool temperate systems, with implications for adaptation strategies for grasslands under climate change.

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管理和温度异常对温带高原草地系统18年记录的CO2通量的交互影响
热浪和寒潮等温度异常现象日益普遍,对生态系统功能和提供的服务构成威胁。虽然温度异常已被证明限制了大尺度的碳固存模式,但对二氧化碳通量和温度异常的精细研究是有限的,而且温度异常与农业管理之间的相互作用仍然知之甚少。利用2003-2021年草地CO2通量和气温的长期数据,研究了温度异常(冷、暖、极冷、极暖)对邻近高原中散草原粗放型和集约化放牛管理处理的总初级生产力和生态系统呼吸的影响。在整个研究期间,温暖和寒冷的温度异常都发生了,平均每年有40天被归类为比正常情况更冷或更暖。无论管理方式和通量类型如何,我们发现温度异常对CO2通量的大小、气温与CO2通量的关系以及异常通量事件的发生都有显著影响。CO2通量的大小受生长季节开始时温度异常的影响最大,并且通量通常对温暖而不是寒冷的温度异常更敏感。然而,低温异常促进了碳吸收和损失之间的非同步。温度- co2通量关系在春季升高,但在夏季和秋季降低,集约化管理处理的通量过程速率降低幅度更大。然而,在该研究系统中,温度异常并不是通量异常的强烈驱动因素。总的来说,我们的研究结果表明,草地管理与温度异常的时间和性质对CO2通量的相互作用,并表明低草地管理强度可能缓冲CO2通量对冷温带系统暖空气温度异常的影响,这对气候变化下草原的适应策略具有重要意义。
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来源期刊
CiteScore
10.30
自引率
9.70%
发文量
415
审稿时长
69 days
期刊介绍: Agricultural and Forest Meteorology is an international journal for the publication of original articles and reviews on the inter-relationship between meteorology, agriculture, forestry, and natural ecosystems. Emphasis is on basic and applied scientific research relevant to practical problems in the field of plant and soil sciences, ecology and biogeochemistry as affected by weather as well as climate variability and change. Theoretical models should be tested against experimental data. Articles must appeal to an international audience. Special issues devoted to single topics are also published. Typical topics include canopy micrometeorology (e.g. canopy radiation transfer, turbulence near the ground, evapotranspiration, energy balance, fluxes of trace gases), micrometeorological instrumentation (e.g., sensors for trace gases, flux measurement instruments, radiation measurement techniques), aerobiology (e.g. the dispersion of pollen, spores, insects and pesticides), biometeorology (e.g. the effect of weather and climate on plant distribution, crop yield, water-use efficiency, and plant phenology), forest-fire/weather interactions, and feedbacks from vegetation to weather and the climate system.
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