Soil basal respiration and nitrogen mineralization from C3 and C4 grass dominated plant communities respond differently to temperature and soil water variation

IF 2.6 3区 环境科学与生态学 Q2 ECOLOGY Journal of Arid Environments Pub Date : 2024-07-24 DOI:10.1016/j.jaridenv.2024.105235
Zigeng Chen, A. Joshua Leffler
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Abstract

Key environmental influences on soil basal respiration (Rs) and nitrogen mineralization (ΔIN) are temperature and soil water content (SWC) and both are being altered by climate change. Yet we cannot expect that variation in temperature and SWC will equally affect all ecosystems. We examine the influences of temperature and SWC on Rs and ΔIN in two grassland plant communities dominated by C3 or C4 species. We collected soil samples from these communities and incubated them at temperatures (5 °C, 10 °C, 15 °C, and 25 °C) and four SWC (10%, 20%, 30% and 40% by weight). After four one-month incubation experiments, we found that (1) plant communities, temperature, and SWC significantly influenced Rs and ΔIN; (2) the highest Rs and ΔIN occurred at 25 °C and 30% SWC in the C4 plant community; (3) in the driest soils, N was immobilized in both communities regardless of temperature. We suggest that there is a greater limitation to C and N mineralization in the C3 plant community than in the C4 plant community making the C3 community less sensitive to variation in temperature and SWC.

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C3和C4禾本科植物群落的土壤基础呼吸作用和氮矿化作用对温度和土壤水分变化的反应不同
影响土壤基本呼吸作用(Rs)和氮矿化作用(ΔIN)的主要环境因素是温度和土壤含水量(SWC),而气候变化正在改变这两个因素。然而,我们不能指望温度和 SWC 的变化会对所有生态系统产生同样的影响。我们研究了两种以 C3 或 C4 物种为主的草地植物群落中温度和 SWC 对 R 和 ΔIN 的影响。我们从这些群落中采集了土壤样本,并在温度(5 °C、10 °C、15 °C和25 °C)和四种SWC(按重量计分别为10%、20%、30%和40%)条件下进行培养。经过四个为期一个月的培养实验,我们发现:(1) 植物群落、温度和 SWC 对 R 和 ΔIN 有显著影响;(2) C4 植物群落在 25 °C 和 30% SWC 条件下的 R 和 ΔIN 最高;(3) 在最干旱的土壤中,无论温度如何,氮在两个群落中都被固定。我们认为,与 C4 植物群落相比,C3 植物群落对 C 和 N 矿化的限制更大,因此 C3 植物群落对温度和 SWC 变化的敏感性较低。
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来源期刊
Journal of Arid Environments
Journal of Arid Environments 环境科学-环境科学
CiteScore
5.70
自引率
3.70%
发文量
144
审稿时长
55 days
期刊介绍: The Journal of Arid Environments is an international journal publishing original scientific and technical research articles on physical, biological and cultural aspects of arid, semi-arid, and desert environments. As a forum of multi-disciplinary and interdisciplinary dialogue it addresses research on all aspects of arid environments and their past, present and future use.
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