脱叶,践踏和营养回报通过调节特征依赖的植物群体组成来对草原生产力产生差异性的影响:来自模拟放牧实验的见解
Tongtian Guo1,2, Yuqi Wei1,2,3, Bin Wei1,2
1College of Grassland Science and Technology, China Agricultural University, Beijing, 100193, China.
Oecologia
|April 21, 2024
概括
牧场通过脱叶,便和践踏影响草原的生产力和植物特征. 内部特征变异 (ITV) 显著影响社区结构和地面净初级生产率 (ANPP).
科学领域:
- 生态生态学 生态生态学
- 植物生态学植物生态学
- 生态系统科学 生态系统科学
背景情况:
- 状牧场包括多个组成部分:脱叶,便/尿液返回和践踏.
- 这些成分可以对植物群体的组成和生产力 (ANPP) 产生抵消或协同效应.
- 植物功能特征是植物对干扰和生态系统功能反应的关键指标,物种周转和物种内特征变化 (ITV) 推动了社区特征组成.
研究的目的:
- 调查模拟放牧组件 (脱叶,便/尿液返回,践踏) 对草原草地中社区加权资源 (CWM),功能多样性 (FD) 和ANPP的影响.
- 区分物种周转和ITV在推动社区特征和ANPP在模拟放牧中的变化中的作用.
主要方法:
- 在中国北部的草原草原上进行了模拟放牧实验.
- 该实验操纵了脱叶,便和尿液的回归以及践踏.
- 测量包括植物功能特征,功能多样性 (FD) 和地面净初级生产率 (ANPP) 的社区加权平均值 (CWM),分析物种周转和ITV的贡献.
主要成果:
- 脱叶通过物种周转和ITV显著改变了CWM和FD,推动了对资源获取战略的特征.
- 尿回报促进了资源获取的社区特征,主要是通过ITV,对FD的影响很小.
- 踩踏通过ITV增加了叶子干物质含量的CWM,没有显著的FD效应. 模拟放牧增强了ANPP,主要是由于营养添加,ITV解释了大多数ANPP变化.
结论:
- 草地组成部分对草地社区结构和ANPP产生多方面的影响.
- 内部特征变异 (ITV) 在塑造草原植物群落组成和生产力方面发挥着至关重要的作用.
- 了解ITV对于预测草原生态系统对放牧的反应至关重要.
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