大气-土壤界面的土壤碳和循环:量化生物土相互作用对全球变化的反应
K Witzgall1, B D Hesse2,3, N L Pacay-Barrientos1
1Soil Science, TUM School of Life Sciences, Technical University of Munich, Freising-Weihenstephan, Germany.
Global change biology
|October 9, 2024
概括
生物土壤地 (生物地) 对于干旱地区的碳和循环至关重要. 气候变暖和干旱破坏生物地的功能,减少碳吸收和固,影响土壤有机物.
科学领域:
- 生态生态学 生态生态学
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
背景情况:
- 干旱地区通过生物土壤皮层 (生物皮层) 支持初级生产,这对碳 (C) 和 (N) 循环至关重要.
- 关于生物如何将固定的C和N转移到矿物土壤以及气候变化如何影响这些流动的知识有限.
研究的目的:
- 在模拟气候变化 (变暖和干旱) 条件下,研究从生物到矿物土壤中的C和N的命运.
- 量化变暖和干旱对生物介导的C和N循环和土壤有机物质形成的影响.
主要方法:
- 在受控的实验室条件下,对生物土系统应用的试验性变暖和干旱.
- 对二氧化碳流量的监测和双同位素标记 (13CO2和15N2) 的应用.
- 使用密度分化和脂脂肪酸分析量化元素路径.
主要成果:
- 干旱严重限制了生物的光合作用C吸收,阻止了净C吸收.
- 生物在底层矿物土壤中促进了C和N的积累,作为与矿物相关的有机物 (MAOM),与真菌主导有关.
- 变暖破坏了这些生物对土壤C和N的影响,并且在变暖和干旱相结合的情况下减少了N的固定.
结论:
- 生物在干旱土壤的C和N动态中发挥着重要作用,促进有机物质的形成.
- 气候变化,特别是气候变暖和干旱,严重损害了生物地的基本功能.
- 生物的破坏威胁到C和N循环,以及干地生态系统中的土壤有机物持续存在.
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