Warming-induced vapor pressure deficit suppression of vegetation growth diminished in northern peatlands

Ning Chen, Yifei Zhang, Fenghui Yuan, Changchun Song (), Mingjie Xu, Qingwei Wang, Guangyou Hao, Tao Bao, Yunjiang Zuo, Jianzhao Liu, Tao Zhang, Yanyu Song, Li Sun, Yuedong Guo, Hao Zhang, Guobao Ma, Yu Du, Xiaofeng Xu () and Xianwei Wang ()
Additional contact information
Ning Chen: Chinese Academy of Sciences
Yifei Zhang: Chinese Academy of Sciences
Fenghui Yuan: Chinese Academy of Sciences
Changchun Song: Chinese Academy of Sciences
Mingjie Xu: Shenyang Agricultural University
Qingwei Wang: Chinese Academy of Sciences
Guangyou Hao: Chinese Academy of Sciences
Tao Bao: Chinese Academy of Sciences
Yunjiang Zuo: Chinese Academy of Sciences
Jianzhao Liu: Chinese Academy of Sciences
Tao Zhang: Shenyang Agricultural University
Yanyu Song: Chinese Academy of Sciences
Li Sun: Chinese Academy of Sciences
Yuedong Guo: Chinese Academy of Sciences
Hao Zhang: Chinese Academy of Sciences
Guobao Ma: Chinese Academy of Sciences
Yu Du: Chinese Academy of Sciences
Xiaofeng Xu: San Diego State University
Xianwei Wang: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract Recent studies have reported worldwide vegetation suppression in response to increasing atmospheric vapor pressure deficit (VPD). Here, we integrate multisource datasets to show that increasing VPD caused by warming alone does not suppress vegetation growth in northern peatlands. A site-level manipulation experiment and a multiple-site synthesis find a neutral impact of rising VPD on vegetation growth; regional analysis manifests a strong declining gradient of VPD suppression impacts from sparsely distributed peatland to densely distributed peatland. The major mechanism adopted by plants in response to rising VPD is the “open” water-use strategy, where stomatal regulation is relaxed to maximize carbon uptake. These unique surface characteristics evolve in the wet soil‒air environment in the northern peatlands. The neutral VPD impacts observed in northern peatlands contrast with the vegetation suppression reported in global nonpeatland areas under rising VPD caused by concurrent warming and decreasing relative humidity, suggesting model improvement for representing VPD impacts in northern peatlands remains necessary.

Date: 2023
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DOI: 10.1038/s41467-023-42932-w

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