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在阿尔卑斯山草原生态系统中吸收甲的土壤湿度值

Peiyan Wang^1,2, Jinsong Wang^1,3, Song Wang^1,3

¹Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.

Global change biology

|February 5, 2025

概括

青海-西藏高原的高山草原是重要的甲 (CH4) 沉地. 以前被低估的干旱条件显示出高CH4吸收,影响全球预算.

科学领域:

环境科学环境科学
生态生态学生态生态学
大气化学大气化学

背景情况:

阿尔卑斯山生态系统的甲 (CH4) 吸收是全球CH4沉降的重要组成部分.
由于空间变化和有限的数据,关于CH4吸收的规模和分布存在重大不确定性.

研究的目的:

调查青海-西藏高原 (QTP) 多样化的高山草原中CH4的吸收.
为了确定控制CH4吸收的关键因素,并估计区域CH4沉幅度.

主要方法:

在3200公里长的横段进行了现场生态系统CH4吸收测量.
分析了控制因素,特别是土壤湿度值.
利用随机森林模型与广泛的现场数据进行区域估计.

主要成果:

观察到CH4吸收的空间差异很大,QTP干燥地区的比例最高.
确定了土壤湿度作为主要控制,临界值为6.2% (v/v).
估计QTP高山草原的区域CH4吸收为0.88 ± 0.020 Tg CH4年−1.

结论:

干燥的高山生态系统,特别是草原,是重要的CH4沉.
目前的全球CH4模型可能低估了干地CH4沉降池的贡献.
准确评估CH4预算需要更好地代表干燥的高山草原的动态.

关键词:

阿尔卑斯山的草原.田间截面截面截面截面甲的吸收方式区域估计区域估计土壤水分的值.

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