土壤营养循环的脱作为全球干旱地区干旱度的函数
Manuel Delgado-Baquerizo1, Fernando T Maestre, Antonio Gallardo
11] Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, Carretera de Utrera, kilómetro 1, 41013 Sevilla, Spain [2] Area de Biodiversidad y Conservación, Departamento de Biología y Geología, Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, Calle Tulipán Sin Número, 28933 Móstoles, Spain.
Nature
|November 1, 2013
概括
气候变化带来的干旱可能会破坏干旱地区的必需营养循环. 增加的干旱性减少了土壤的碳 (C) 和 (N),但增加了 (P),解开了这些重要的生物地球化学循环.
科学领域:
- 生态生态学 生态生态学
- 生物地质化学生物地质化学
- 环境科学 环境科学
背景情况:
- 碳 (C), (N) 和 (P) 的生物地化学循环对陆地生态系统至关重要.
- 由于不同的生物和地化学控制,这些循环可能会脱,特别是在气候变化下.
- 旱地生态系统对干旱特别敏感,因为水的可用性决定了生物活动.
研究的目的:
- 调查干旱程度的增加如何影响全球干旱地区的C,N和P周期的平衡.
- 评估气候变化可能扰乱这些脆弱地区的营养物质供应和生态系统服务的可能性.
主要方法:
- 分析了来自所有大陆 (除南极洲外) 224个干旱地区的土壤样本.
- 评估干旱度与土壤有机C,总N和无机P度之间的关系.
- 评估植物覆盖的影响以及物理气候变化和生物分解过程之间的平衡.
主要成果:
- 干旱与土壤有机C和总N度有负相关性.
- 干燥度与土壤无机P度正相关.
- 干旱性增加与植物覆盖面的减少有关,有利于物理气候变化而不是生物分解.
结论:
- 预计干旱度的增加可能会减少C和N,而在干旱土地土壤中增加P.
- 这些变化将使C,N和P循环脱,可能会损害全球干旱地区的基本生态系统服务.
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