增温增水情景下钉柱委陵菜物候序列的变化及其抗冻性  

Changes of phenological sequence of Potentilla saundersiana and its frost resistance under the scenarios of warming and increasing precipitation

作　　者：索南吉 李博文[4,5] 吕汪汪 王文颖 拉本 陆徐伟 宋扎磋 陈程浩 苗琪 孙芳慧 汪诗平 SUONAN Ji;LI Bo-Wen;LÜWang-Wang;WANG Wen-Ying;LA Ben;LU Xu-Wei;SONGZHA Cuo;CHEN Cheng-Hao;MIAO Qi;SUN Fang-Hui;WANG Shi-Ping(College of Life Sciences,Qinghai Normal University,Xining 810016,China;Academy of Plateau Science and Sustainability,Xining 810016,China;Key Laboratory of Biodiversity Formation Mechanism and Comprehensive Utilization of the Qinghai-Tibet Plateau in Qinghai Province,Xining 810016,China;State Key Laboratory of Tibetan Plateau Earth System,Resources and Environment,Institute of Tibetan Plateau Research,Beijing 100101,China;Naqu Alpine Grassland Ecosystem National Field Scientific Observation and Research Station,Naqu,Xizang 852000,China;University of the Chinese Academy of Sciences,Beijing 100049,China;and 7Tibet University,Lhasa 850000,China)

机构地区：[1]青海师范大学生命科学学院,西宁810016 [2]高原科学与可持续发展研究院,西宁810016 [3]青海省青藏高原生物多样性形成机制与综合利用重点实验室,西宁810016 [4]青藏高原地球系统资源环境国家重点实验室,中国科学院青藏高原研究所,北京100101 [5]西藏那曲高寒草地生态系统国家野外科学观测研究站,西藏那曲852000 [6]中国科学院大学,北京100049 [7]西藏大学,拉萨850000

出　　处：《植物生态学报》2024年第2期158-170,共13页Chinese Journal of Plant Ecology

基　　金：国家自然科学基金(42230504、32160285和31800407);青海省科学技术厅自然科学基金(2020-ZJ-952Q)。

摘　　要：青藏高原正在经历剧烈的气候变化,包括变暖、变湿和极端气候事件频发等,然而,气候变化对高寒植物的影响目前还了解较少。该研究依托西藏那曲高寒草地生态系统野外科学观测研究站,以高寒草甸优势双子叶植物钉柱委陵菜(Potentilla saundersiana)为研究对象,在2016–2018年设置了不同幅度的增温和降水改变实验,观测了不同处理下6个物候序列的变化,在7个不同极端降温幅度下定量了抗冻性,并计算了2011–2022年生长季的安全裕度。主要结果有:1)增温1℃和2℃以及增水50%对钉柱委陵菜物候序列的影响不显著,只有增温达到4℃时,返青期显著推迟,而初花期显著提前。2)钉柱委陵菜的抗冻性(半致死温度)为(–4.76±4.28)℃,2011–2022年的生长季中34%的月份防止冻害的安全裕度为负值,且大多出现在5月和9月,表明钉柱委陵菜在早春和秋末遭遇极端霜降事件的风险很大。该研究结果揭示了多幅度增温和增水对钉柱委陵菜物候序列的影响,解析了钉柱委陵菜对极端降温事件的抗性,为预测青藏高原高寒植物对未来气候变化的响应提供了数据支撑。Aims Qingzang Plateau is experiencing rapid climate change,including warming,wetting and frequent extreme weather events,however,we know less about the effects of these climate changes on alpine plants.Methods We observed six phenological sequences of Potentilla saundersiana under simulating multi-level warming and precipitation changes,in 2016 through 2018.Then,by simulating seven different extreme cooling extents,we determined the frost resistance of P.saundersiana,and calculated its safety margin in the growing seasons during the experiment period.Important findings Warming(1°C and 2°C)and precipitation increase(50%)had limited effects on the phenological sequences of P.saundersiana.But when temperature increased by 4°C,first leafing day was significantly delayed,while first flowering day was significantly advanced.The frost resistance(LT50)of P.saundersiana was(–4.76±4.28)°C,and the safety margin against frost damage was negative in 34%of months of the growing season during 2011–2022,and most of them occurred in May and September,indicating high risk of extreme frost in the early and late growing season.These results revealed the effects of multi-level warming and increased precipitation on the phenological sequences of P.saundersiana,clarified the resistance of P.saundersiana to extreme cooling events,and provide insight into predicting the response of alpine plants to climate change in the future on the Qingzang Plateau.

关 键 词：多幅度增温 物候序列 极端降温事件 抗冻性 安全裕度 

分 类 号：Q948[生物学—植物学]