在温带草地上，营养物质的添加通过禁止植物的丰度改变抗旱性和恢复力

IF 6 1区农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY

Agriculture, Ecosystems & Environment Pub Date : 2024-11-21 DOI:10.1016/j.agee.2024.109385

Dengnan Luo , Guojiao Yang , Guangru Zhang , Qianguang Liu , Qun Guo , Shenggong Li , Yun Xie , Zhongmin Hu

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引用次数: 0

摘要

养分添加对草原生态系统产生了深远影响。然而，草原群落对养分添加的抵抗力（干旱期间维持生态系统功能的能力）和恢复力（干旱后恢复的能力）的反应和生态机制尚未完全清楚。我们研究了养分添加对经历干旱年的温带草原的抵抗力和恢复力的影响。我们的研究结果表明，在添加氮元素的情况下，整个群落和草本植物的抵抗力都有所下降，而在添加磷元素的情况下，只有草本植物的抵抗力显著下降。有趣的是，氮的添加也阻碍了群落和草本植物的抗逆性，而群落的抗逆性在磷的添加下明显增强。出乎意料的是，尽管养分的添加会显著影响草的生物量，但草的抗逆性和恢复力并没有因养分的添加而发生显著变化。此外，结构方程模型显示，养分添加通过禁草物种的丰度影响群落的抗旱性和恢复力。我们的研究结果凸显了禁草在面对全球变化时维持草地群落稳定性的关键作用。这为全球变化下草原生态系统的科学管理和生态系统服务的可持续保护提供了重要的科学依据。

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Nutrient addition alters drought resistance and resilience via forb abundance in a temperate grassland

Nutrient addition has resulted in profound effects on grassland ecosystems. Yet, the response and ecological mechanisms of grassland community resistance (the ability to maintain ecosystem function during drought) and resilience (the capacity to recover after drought) in relation to nutrient addition are not fully understood. We investigated the effects of nutrient addition on resistance and resilience of a temperate grassland experiencing a drought year. Our findings demonstrated that the resistance of both the whole community and forb species decreased under nitrogen (N) addition, while only forb resistance significantly decreased under phosphorus (P) addition. Interestingly, N addition also hindered the community and forb resilience, whereas community resilience significantly enhanced under P addition. Unexpectedly, even although nutrient addition significantly affected grass biomass, grass resistance and resilience were not significantly altered by nutrient addition. Furthermore, structural equation models revealed that nutrient addition affect community drought resistance and resilience via the abundance of forb species. Our outcomes highlight the crucial function of forb in sustaining grassland community stability in the face of global change. It provides crucial scientific evidence for the scientific management and sustainable preservation of ecosystem services in grassland ecosystems under global change.

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来源期刊

Agriculture, Ecosystems & Environment 环境科学-环境科学

CiteScore

11.70

自引率

9.10%

发文量

392

审稿时长

26 days

期刊介绍： Agriculture, Ecosystems and Environment publishes scientific articles dealing with the interface between agroecosystems and the natural environment, specifically how agriculture influences the environment and how changes in that environment impact agroecosystems. Preference is given to papers from experimental and observational research at the field, system or landscape level, from studies that enhance our understanding of processes using data-based biophysical modelling, and papers that bridge scientific disciplines and integrate knowledge. All papers should be placed in an international or wide comparative context.