功能类型调解了根驱动的原始化效应和新碳形成对变暖的反应
Dongmei Wu1, Xiaohong Wang1, Xiaodong Yao1
1Key Laboratory of Humid Subtropical Eco-geographical Process of Ministry of Education, School of Geographical Sciences, Fujian Normal University, Fuzhou 350117, China; Fujian Sanming Forest Ecosystem National Observation and Research Station, Fujian Normal University, Fuzhou 350117, China; State Key Laboratory of Humid Subtropical Mountain Ecology, Ministry of Science and Technology and Fujian Province Funded, Fuzhou 350117, China.
The Science of the total environment
|May 16, 2024
概括
根的功能类型显著影响土壤有机碳的动态和原始效应,特别是在变暖的条件下. 吸收根比运输根更能增强土壤碳的形成,根据根类型而言,变暖会对原始化产生不同的影响.
科学领域:
- 土壤科学 土壤科学
- 生态生态学 生态生态学
- 生物地质化学生物地质化学
背景情况:
- 根垃圾输入通过原始化效应 (PE) 和新的SOC形成影响土壤有机碳 (SOC) 动态.
- 根功能类型对PE和新碳形成的影响,特别是在变暖下,仍然不清楚.
- 了解这些过程对于预测森林生态系统中的土壤碳预算至关重要.
研究的目的:
- 调查根功能类型 (吸收型与输送型根) 如何调解原始化效应和新的SOC形成.
- 评估这些过程对4°C升温情景的反应.
- 阐明气候变化下的中国树种植园对土壤碳动态的影响.
主要方法:
- 在环境 (19°C) 和温暖 (23°C) 条件下在同位素不同的土壤中化中国根 (吸收和运输) 210天.
- 通过整合瞬间的PE率来计算累积的PE.
- 使用基于δ13C值的双源混合模型量化新形成的SOC (SOCrl).
主要成果:
- 吸收根引发的累积PE和SOCrl明显高于运输根,与更大的微生物生物质和酶活性有关.
- 变暖增加了两种根类型的杂草分解,但仅对运输根类型显著增强了PE,表明功能类型依赖的敏感性.
- 变暖对两种根类型的SOCrl都没有显著影响,导致运输根添加下SOC净余额下降.
结论:
- 根功能类型是根驱动PE对气候变暖反应的主要媒介,而不是新的C的形成.
- 这些发现有助于我们更好地了解土壤有机碳的动态,以应对森林种植园中的气候变化.
- 基于根功能类型的PE对变暖的差异反应对土壤碳预算有重大影响.
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