多种生态系统服务在典型的亚热带森林中受过多的树冠和底层气添加的影响不同
Yang Tian1,2, Peng Zhou3, Lang Zhou4
1Guangdong Provincial Key Laboratory of Applied Botany & Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China.
Global change biology
|February 18, 2024
概括
大气中沉积会影响森林生态系统服务. 覆盖层以上的气添加增加了植物的营养物质保留,但不是其他服务,揭示了权衡. 底层的增加很难模拟这些效应.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 林业 林业 林业 林业 林业
背景情况:
- 大气中 (N) 沉积对森林生态系统产生重大影响,特别是在中国亚热带地区等严重污染的地区.
- 以前的研究经常使用地下N添加,可能无法捕捉大气N沉积对多种生态系统服务的全部影响.
研究的目的:
- 量化顶和地下树木N增量对多种森林生态系统服务的影响.
- 在模拟大气N沉积影响时,比较底层与顶层N添加的有效性.
- 在不同的N添加场景下,研究土壤和植物服务之间的关系和权衡.
主要方法:
- 在一个亚热带森林中进行了为期7年的大规模实地实验.
- 顶和下层的N添加量以不同的速度被应用 (25和50公斤Nha-1年-1年).
- 量化了多种生态系统服务,包括营养保留,土壤营养积累,水产,碳捕获和氧气释放.
主要成果:
- 超过树冠的N添加 (50公斤N ha-1年-1年) 显著增强了植物的营养保留,但没有影响土壤的营养积累,水产,C封存或氧气释放.
- 在过度树冠N添加的情况下,观察到土壤和植物营养/C服务之间的权衡.
- 地下N添加并没有准确模拟大气N沉积的影响,较弱的权衡,甚至在较低的速度下产生协同效应.
- 工厂N,P保留和C封存在超顶N添加下增加,但在底层N添加下减少.
结论:
- 树冠在保留营养素方面发挥着至关重要的作用,对大气中N沉积非常敏感.
- 底层N添加实验可能无法准确地反映大气N沉积对多种生态系统服务及其相互关系的复杂影响.
- 森林树冠过程对于减轻全球变化因素的威胁至关重要,需要在多样化的森林生态系统中进行进一步的研究.
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