Asymmetric impacts of daytime and nighttime warming on
vegetation coverage in marsh wetlands of the Tibetan Plateau

doi:10.1093/jpe/rtag034

J Plant Ecol ›› Advance articles DOI:10.1093/jpe/rtag034

• Research Article • Next Articles

Asymmetric impacts of daytime and nighttime warming on vegetation coverage in marsh wetlands of the Tibetan Plateau

Liyuan Wu^a,b, Jinfeng Xu^a*, Jiaqi Zhang^a,b, Xingdong Zhang^a, Chen Ding^a,b, Jiaqi Hu^a,b, Siyi Zheng^a,b, Yuanhao Yao^a, Xianguo Lu^a, Ming Jiang^a, Xiangjin Shen^a,c*

^aNortheast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
^bUniversity of Chinese Academy of Sciences, Beijing 100049, China
^cKey Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun, 130024, China
^*Corresponding author: xujinfeng@iga.ac.cn; shenxiangjin@iga.ac.cn
Address: 4888 Shengbei Street, Changchun 130102, Jilin, China.
Tel: +86-043185542307
Fax: +86-043185542307
E-mail: xujinfeng@iga.ac.cn; shenxiangjin@iga.ac.cn

Received:2025-07-25 Accepted:2026-01-31 Published:2026-03-06
Supported by:
This work was supported by National Natural Science Foundation of China (42422101, 42371070, 42501121), National Key Research and Development Program of China (2023YFF0807204), Natural Science Foundation of Jilin Province (20250101113XM) and Youth Innovation Promotion Association, CAS (2019235).

昼夜增温对青藏高原沼泽湿地植被覆盖度的不对称影响

Abstract

Abstract: Climate change profoundly affects vegetation coverage in marsh wetlands of the Tibetan Plateau, thereby influencing regional biodiversity. Until recently, understanding of how vegetation coverage in Plateau marshes respond to climatic changes is limited. In this study, spatiotemporal change in vegetation coverage across the Tibetan Plateau was analyzed using leaf area index and meteorological data from 2001 to 2022, with emphasis on hydrothermal forcing mechanisms. Growing season average vegetation coverage increased significantly (P < 0.05) by 0.01 m² m^-2 a^-1. While overall growing season precipitation show no significant influence on vegetation coverage across the plateau, changes in monthly precipitation were found to have region-specific effects. Specifically, increased precipitation in May and June significantly reduced vegetation coverage in the central plateau but enhanced it markedly in the southwestern region. Regarding temperature effects, growing season warming generally increased vegetation coverage across the plateau. We identified an asymmetric effect of diurnal temperature on vegetation coverage: nighttime warming had a more pronounced positive effect than equivalent daytime warming. A 1 °C increase in growing season daytime maximum and nighttime minimum temperatures increased vegetation coverage by 0.15 and 0.21 m² m^-2, respectively. This asymmetry effect was also evident across specific months. Nighttime warming in May and September significantly enhanced vegetation coverage across the plateau, whereas daytime warming during these months showed no significant effect. Contrastingly, increased daytime and nighttime temperatures in July were associated with decreased and increased vegetation coverage, respectively, in the southwestern region. Our findings will contribute to further understand the relationship between global climate change and alpine wetland ecosystem.

Nighttime warming has a significantly greater positive effect on vegetation growth than daytime warming.

Key words: marsh wetlands, vegetation coverage, climate change, diurnal temperature, Tibetan Plateau

摘要：
气候变化对青藏高原沼泽湿地植被覆盖度具有重要影响，进而影响区域生物多样性。截止到目前，关于青藏高原沼泽植被覆盖度如何响应气候变化的认知相对较少。本研究利用叶面积指数和气象数据集，分析了2001-2022年青藏高原沼泽植被覆盖度的时空变化，并重点探究了其水热驱动机制。研究结果表明，过去20年青藏高原沼泽湿地生长季平均植被覆盖度总体以每年0.01 m² m^-2的速率显著增加。尽管生长季降水对沼泽湿地植被覆盖度的总体影响并不显著，但月降水量变化对植被覆盖度的影响呈现明显区域差异： 5月和6月降水的增加会显著降低青藏高原中部沼泽植被覆盖度，但显著增加西南地区沼泽植被覆盖度。在气温影响方面，生长季内气温升高总体上增加了青藏高原植被覆盖度。生长季昼夜增温对沼泽湿地植被覆盖度具有不对称影响：夜间气温升高对青藏高原沼泽植被生长的促进作用比白天升温更显著。生长季平均白天最高温和夜晚最低温每升高1℃会分别导致生长季沼泽植被覆盖度增加0.15和0.21 m² m^-2。这种不对称性影响也明显呈现在一些月份。5月与9月夜晚升温显著增加了青藏高原沼泽植被覆盖度，而白天升温对青藏高原沼泽植被影响并不显著。相比之下，7月夜晚升温显著增加了高原西南部地区沼泽植被覆盖度，但白天升温却导致该地区沼泽植被覆盖度下降。我们的研究结果将有助于进一步了解全球气候变化与高寒湿地生态系统之间的相互关系。

关键词: 沼泽湿地, 植被覆盖度, 气候变化, 昼夜温度, 青藏高原

Liyuan Wu, Jinfeng Xu, Jiaqi Zhang, Xingdong Zhang, Chen Ding, Jiaqi Hu, Siyi Zheng, Yuanhao Yao, Xianguo Lu, Ming Jiang, Xiangjin Shen. Asymmetric impacts of daytime and nighttime warming on vegetation coverage in marsh wetlands of the Tibetan Plateau[J]. J Plant Ecol, DOI: 10.1093/jpe/rtag034.

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Asymmetric impacts of daytime and nighttime warming on vegetation coverage in marsh wetlands of the Tibetan Plateau

昼夜增温对青藏高原沼泽湿地植被覆盖度的不对称影响

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