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Drier year exhibits amplified promoting effects of shrub encroachment on methane uptake in Tibetan alpine meadows

文献类型：期刊论文

作者Nan, Lili5; Zhang, Zelong5; Gan, Dezhao1; Li, Huinan6,7; Yu, Dongsheng5; Lin, Zhenrong8; Li, Zheng8; Hu, Jian6,7; Wang, Hui6,7; Zhou, Qingping6,7
刊名AGRICULTURAL AND FOREST METEOROLOGY
出版日期2026-03-01
卷号378页码:111007
关键词Methane Methanotrophs Shrub encroachment Nongrowing season Temperate steppe Tibetan alpine meadow
ISSN号0168-1923
DOI10.1016/j.agrformet.2025.111007
产权排序6
文献子类Article
英文摘要Shrub encroachment into grasslands notably influences the ecosystem services and the economics provided by these ecosystems. However, the effects of shrub encroachment on the multiyear methane (CH4) uptake and associated mechanisms in alpine meadows remain unknown. Here, we combined two years of CH4 flux measurements from paired shrub patches (SPs) and ambient meadow patches (MPs) in a Tibetan alpine meadow with collated annual CH4 fluxes derived from meta-analysis across alpine meadows and temperate steppes in northern China. We found that the increase in the annual CH4 uptake under shrub encroachment was greater during a dry year 2023-2024 (a net increase of 0.91 +/- 0.40 kg C ha(-1)) than during a wet year 2022-2023 (0.52 +/- 0.19 kg C ha(-1)). Approximately 20-40% of these net increases occurred during the nongrowing season (NGS). Meta-analysis verified that shrub encroachment significantly increased CH4 uptake in Tibetan alpine grass meadows, in which the significantly decreased topsoil water-filled pore space (WFPS) and increased functional gene (pmoA) abundance levels for soil methanotrophs jointly explained these results. CH4 uptake during the NGS contributed 22 similar to 28% and 21 similar to 30% to the annual CH4 uptake in MPs and SPs, respectively. A bell-shaped relationship was observed with the growing season (GS) soil WFPS, with the lowest NGS contribution occurring at intermediate soil WFPS. The annual CH4 uptake was greater in temperate steppes than in alpine shrub meadows and grass meadows across northern China, which was driven mainly by the significant decrease in soil WFPS. These results provide a basis for understanding the magnitudes of CH4 uptake in alpine meadows and their responses to shrub encroachment. Initiating long-term CH4 flux measurements from various encroached shrub species and across different shrub encroachment intensities can increase our understanding of soil CH4 uptake within the context of increasing shrub encroachment trends.
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WOS关键词WOODY-PLANT ENCROACHMENT ; SOIL ; WATER ; VEGETATION ; GRASSLAND ; DYNAMICS ; EXCHANGE ; IMPACTS ; FLUXES ; FIRE
WOS研究方向Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
语种英语
WOS记录号WOS:001658785300001
出版者ELSEVIER
源URL[http://ir.igsnrr.ac.cn/handle/311030/219692]  
专题生态系统网络观测与模拟院重点实验室_外文论文
通讯作者Ma, Lei
作者单位1.Lanzhou Univ, Coll Atmospher Sci, Lanzhou 730000, Peoples R China;
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Simulat, Beijing 100101, Peoples R China;
3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Sichuan Zoige Alpine Wetland Ecosyst Natl Observat, Beijing 100101, Peoples R China;
4.Univ Chinese Acad Sci, Sch Resources & Environm, Beijing 100049, Peoples R China
5.Gansu Agr Univ, Coll Pratacultural Sci, Minist Educ, Key Lab Grassland Ecosyst, Lanzhou 730070, Gansu, Peoples R China;
6.Southwest Minzu Univ, Coll Grassland Resources, Chengdu 610041, Peoples R China;
7.Southwest Minzu Univ, Inst Qinghai Tibetan Plateau, Sichuan Zoige Alpine Wetland Ecosyst Natl Observat, Chengdu 610041, Peoples R China;
8.Lanzhou Univ, Coll Ecol, Lanzhou 730000, Peoples R China;
推荐引用方式
GB/T 7714		 Nan, Lili,Zhang, Zelong,Gan, Dezhao,et al. Drier year exhibits amplified promoting effects of shrub encroachment on methane uptake in Tibetan alpine meadows[J]. AGRICULTURAL AND FOREST METEOROLOGY,2026,378:111007.
APA Nan, Lili.,Zhang, Zelong.,Gan, Dezhao.,Li, Huinan.,Yu, Dongsheng.,...&Ma, Lei.(2026).Drier year exhibits amplified promoting effects of shrub encroachment on methane uptake in Tibetan alpine meadows.AGRICULTURAL AND FOREST METEOROLOGY,378,111007.
MLA Nan, Lili,et al."Drier year exhibits amplified promoting effects of shrub encroachment on methane uptake in Tibetan alpine meadows".AGRICULTURAL AND FOREST METEOROLOGY 378(2026):111007.

入库方式： OAI收割

来源：地理科学与资源研究所

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