Journal of Plant Ecology ›› 2025, Vol. 18 ›› Issue (6): 1-.DOI: 10.1093/jpe/rtaf114
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Yunlong He1, Yangjian Zhang1,2, Juntao Zhu1,2,*, Qiang Yu3, Dashuan Tian1, Xiaoan Zuo4, Changhui Wang5,*, Jielin Liu6, Cunzheng Wei7, Hui An8, Fawei Zhang9, Bo Zhang10, Yann Hautier11 and Lin Jiang12
1Lhasa Plateau Ecosystem Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China, 2College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China, 3School of Grassland Science, Beijing Forestry University, Beijing 100083, China, 4Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730030, China, 5College of Grassland Science, Shanxi Agricultural University, Taigu 030801, China, 6Grass and Science Institute of Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China, 7State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China, 8School of Ecology and Environment, Ningxia University, Ningxia 750021, China, 9Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810001, China, 10Xinjiang Key Laboratory of Desert Plant Roots Ecology and Vegetation Restoration, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China, 11Ecology and Biodiversity Group, Department of Biology, Utrecht University, 3584 CH Utrecht, The Netherlands, 12School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
*Corresponding authors. E-mail: zhujt@igsnrr.ac.cn (J.Z.); wangch@ibcas.ac.cn (C.W.)
摘要： 养分富集会降低生态系统稳定性。然而，生物和非生物因素(如气候、植物多样性等)如何调控养分效应的程度，目前尚不明确。本研究依托中国7个跨越气候梯度的草地氮、磷养分添加试验平台(年平均温度：–0.38至8.75 °C；年降水量：134.60至462.40 mm)，通过地上净初级生产力连续4年的监测数据计算其时间稳定性，探究了气候因子和植物多样性对养分富集情境下生态系统稳定性的调控机制。研究发现，在所有样地中，氮添加和氮磷共同添加显著降低了生态系统稳定性，而单独添加磷对其影响较弱。然而，养分对不同样点的影响程度并不一致，主要与该样点初始物种丰富度和温度季节性密切相关：物种丰富度较高的样点，氮或磷富集对其优势种稳定性和群落稳定性的影响更大。进一步基于结构方程模型的分析结果显示，单独氮或磷添加主要通过降低优势种稳定性进而降低群落稳定性。上述结果表明，养分添加对草地生态系统稳定性的影响取决于不同地区的初始植物多样性，这一发现为全球环境变化背景下草地适应性管理提供重要启示。
