在半干旱的草原中,主导物种在降水时间变化下驱动生态系统的多功能性
Hongyan Zhu1, Chunkun Fan2, Huiru Jin1
1International Joint Research Laboratory for Global Change Ecology, School of Life Sciences, Henan University, Kaifeng, China.
Ecological applications : a publication of the Ecological Society of America
|September 22, 2025
概括
降水减少显著降低了半干旱草原的生态系统多功能性 (EMF),影响了地面和地下的功能. 生物多样性,包括分类学和遗传学多样性 (PD),在变化的降雨模式下没有影响EMF.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 生物多样性研究 生物多样性研究
背景情况:
- 生态系统的多功能性 (EMF) 对生态系统的稳定性和服务至关重要.
- 降水模式的变化对生态系统功能构成重大威胁.
- 不同的生物多样性维度 (分类学,功能,植物遗传多样性 (PD)) 在改变降水条件下调解EMF的作用尚不清楚.
研究的目的:
- 研究改变降水模式对总电磁场,地面电磁场 (AGEMF) 和地下电磁场 (BGEMF) 的影响.
- 在不同降水场景下评估EMF的分类学,功能和PD的相对重要性.
- 在半干旱的草原生态系统中,在降水变化下确定EMF的关键驱动因素.
主要方法:
- 在半干旱的草原中进行了为期7年的实地操纵实验.
- 在生长季节的不同时期,降水量发生了变化 (减少和增加).
- 测量了分类学多样性,功能多样性,PD,AGEMF,BGEMF和土壤水分.
主要成果:
- 降水减少 (早期,晚期和整个生长季节) 显著减少了EMF,AGEMF和BGEMF.
- 降水增加对AGEMF产生了有限的积极影响,但对总EMF或BGEMF没有重大影响.
- 种类主导是降水量下降的 AGEMF 和 BGEMF 的关键驱动因素,而土壤湿度则预测了降水量增加的 AGEMF.
- 在研究的降水变化下,功能多样性和PD并没有显著影响EMF.
结论:
- 生态系统的多功能性对降水变化表现出不对称的反应,对降水变化比增加更敏感.
- 晚期生长季节降水减少 (DLP) 特别削弱了EMF,减少了主导物种的作用.
- 这些发现强调了半干旱草原生态系统对降水变化的脆弱性,并突出了针对性草原管理战略的必要性.
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