海拔梯度调节了草本植物上侵对高山苔原牛皮杜鹃长期生长趋势与气候敏感性的影响

doi:10.1093/jpe/rtaf181

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海拔梯度调节了草本植物上侵对高山苔原牛皮杜鹃长期生长趋势与气候敏感性的影响

收稿日期:2025-04-23 接受日期:2025-10-13

Elevation gradient modulates the effects of herbaceous encroachment on the long-term growth trends and climate sensitivity of Rhododendron aureum in alpine tundra

Na Li^1,2,#, Suke Hou^1,#, Mai-He Li^1,2,3, Xi Qi⁴, Liangjun Zhu⁵, Jitang Li⁶, Paolo Cherubini^2,7, Zhaoyong Hu⁸, Zhengfang Wu¹, Renkai Dong¹, Lei Wang^9,*, Youwen Wang¹⁰, Danyang Yuan⁵, Haibo Du^1,11,*

¹Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun 130024, China

²Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf 8903, Switzerland

³School of Life Science, Hebei University, Baoding 071002, China

⁴Forest Ecology Stable lsotope Center, College of JunCao Science and Ecology, Fujian Agriculture and Forestry University, Fuzhou 350002, China

⁵Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education School of Ecology, Northeast Forestry University, Harbin 150040, China

⁶Institute of Ecology, College of Urban and Environmental Science, the MOE Laboratory for Earth Surface Processes, Peking University, Beijing 100871, China

⁷Department of Forest and Conservation Sciences, Faculty of Forestry, University of British Columbia, 2004-2424 Main Mall, Vancouver, BC V6T 1Z4, Canada

⁸State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China

⁹State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China

¹⁰Changbai Mountain Administrative Committee Nature Reserve Management Center, Yanbian Korean Autonomous Prefecture 133613, China

¹¹Key Laboratory of Vegetation Ecology, Ministry of Education, Northeast Normal University, Changchun 130024, China

^#These authors contributed equally to this work.
^*Correspondences: Dr. Haibo Du and Dr. Lei Wang
School of Geographical Sciences, Northeast Normal University
No. 5268, Renmin Street, Changchun 130024, China
E-mail: duhb655@nenu.edu.cn; E-mail: wanglei@neigae.ac.cn

Received:2025-04-23 Accepted:2025-10-13
Supported by:
This study was supported by the National Natural Science Foundation of China (grant number 42371052, 42271100, 42271119), the funding from China Scholarship Council (CSC) (202306620087), the Science and Technology Research Project of Education Department of Jilin Province (grant number JJKH20250314KJ), and the Youth Innovation Promotion Association, Chinese Academy of Sciences (grant number 2023238).

摘要/Abstract

摘要： 随着全球变暖驱动植物向上迁移，长白山高山苔原正经历低海拔草本植物大叶章(Deyeuxia angustifolia (Komarov) Y. L. Chang)的持续上侵。然而，其对牛皮杜鹃(Rhododendron aureum Georgi)等原生灌木的影响尚不明确。本研究基于线性模型和混合效应模型，分析了不同海拔和大叶章上侵梯度下牛皮杜鹃的径向生长趋势与气候敏感性，并探讨了土壤理化性质与植物功能性状的调节作用。结果表明，与低海拔相比，高海拔区域牛皮杜鹃表现出更强的长期正向生长趋势；大叶章轻度和中度上侵增强了牛皮杜鹃的正向生长趋势，尤其在低海拔地区更为突出。此外，牛皮杜鹃在中海拔区域的气候敏感性较弱，而在低海拔对冬季温度、高海拔对春夏温度和降水的响应更强。大叶章上侵进一步增强了这种气候敏感性，具体表现为对春、秋、冬季温度的负响应增强，而对夏季温度与秋季降水的正响应增强。总体而言，海拔主要通过土壤条件和植物大小性状影响牛皮杜鹃的生长及其对降水的敏感性，而土壤条件与叶片经济性状则主导其对温度的敏感性。本研究加深了对高山植被动态与入侵机制的理解，为气候变化背景下的高山生态系统保护提供了科学依据。

关键词: 气候变化, 常绿矮灌木, 海拔, 气候敏感性, 土壤性质, 植物功能性状

Abstract: As global warming drives plant upward migration, the alpine tundra of Changbai Mountain is experiencing encroachment by Deyeuxia angustifolia (Komarov) Y. L. Chang, a low-elevation herb. However, its impact on native shrubs such as Rhododendron aureum Georgi remains unclear. Here, we analyzed the radial growth trends and climate sensitivity of R. aureum across elevations and encroachment gradients using linear and mixed-effects model methods, and explored the mediating roles of soil properties and plant traits. Our study revealed that R. aureum exhibited stronger positive long-term growth trend at higher elevations compared to lower elevations. Mild and moderate encroachment of D. angustifolia enhanced the positive growth trend of R. aureum, especially at the low elevations. Moreover, R. aureum showed weak climate sensitivity at mid-elevation but stronger responses to winter temperatures at low elevation and to spring–summer temperatures and precipitation at high elevation. D. angustifolia encroachment further intensified this sensitivity, characterized by stronger negative responses to spring, autumn, and winter temperatures but positive responses to summer temperatures and autumn precipitation. Overall, elevation primarily influenced R. aureum growth and its sensitivity to precipitation through soil conditions and plant size traits. Soil conditions and leaf economic traits influence temperature sensitivity. These findings advance understanding of alpine vegetation dynamics and contribute to ecosystem conservation under climate change.

Key words: climate change, dwarf evergreen shrubs, elevation, climate sensitivity, soil properties, plant functional traits

. 海拔梯度调节了草本植物上侵对高山苔原牛皮杜鹃长期生长趋势与气候敏感性的影响[J]. Journal of Plant Ecology, DOI: 10.1093/jpe/rtaf181.

Na Li, Suke Hou, Mai-He Li, Xi Qi, Liangjun Zhu, Jitang Li, Paolo Cherubini, Zhaoyong Hu, Zhengfang Wu, Renkai Dong, Lei Wang, Youwen Wang, Danyang Yuan, Haibo Du. Elevation gradient modulates the effects of herbaceous encroachment on the long-term growth trends and climate sensitivity of Rhododendron aureum in alpine tundra[J]. J Plant Ecol, DOI: 10.1093/jpe/rtaf181.

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