升高的CO2与营养投入相互作用,以重组有限的草原中的植物群落
Christopher R Taylor1,2, Luke C England2, J Ben Keane2,3
1Soil and Ecosystem Ecology, Earth and Environmental Sciences, University of Manchester, Manchester, UK.
Global change biology
|January 26, 2024
概括
增加的二氧化碳 (CO2) 和营养添加剂显著改变了P限制的草原植物群落. 与酸性草原不同,石灰岩草原由于二氧化碳和营养物相互作用,其组成和功能发生了更大的变化.
科学领域:
- 生态生态学 生态生态学
- 植物社区动态 植物社区动态
- 全球变化生物学
背景情况:
- 大气中的二氧化碳和 (N) 沉积量在全球范围内不断增加,影响植物群落.
- 在植物群落上,二氧化碳增加,沉积和 (P) 限制之间的相互作用尚不清楚.
- 之前的研究重点是丰富,不太关注与二氧化碳和限制的联合效应.
研究的目的:
- 调查同时增加高水平的二氧化碳 (eCO2),和对草原生物多样性和社区组成的影响.
- 了解这些因素如何在P限草原生态系统中相互作用.
- 为了比较石灰岩和酸性草原类型之间的反应.
主要方法:
- 来自长期N添加 (25年以上) 和P添加 (11-25年) 地点的土壤草单体被使用.
- 单体石被暴露在高水平的二氧化碳 (600 ppm) 中三年.
- 营养添加剂 (N和P) 与高二氧化碳处理一起应用.
主要成果:
- 由于增加了CO2,N和P,这两种草原类型的社区组成发生了显著的变化.
- 石灰岩草原对eCO2的反应更强,由于eCO2 - 营养物相互作用而导致的显著功能转变.
- 豆类覆盖面增加,功能主导地位从草转向,以应对石灰岩草原中eCO2和营养处理的结合.
结论:
- 增加的二氧化碳可以不成比例地有利于某些物种 (例如,) 在P限制的草原中获得P.
- 草原的功能成分对eCO2和营养负载敏感,特别是在具有多种P获取策略的P有限系统中.
- 与石灰岩草原相比,酸性草原对eCO2和营养相互作用的敏感性较低,可能是由于最初的多样性和P-获取策略较低.
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