人类活动重塑了内陆水域的温室气体排放
Shaoda Liu1, Junfeng Wang1, Wenhao Xu1
1Key Laboratory of Water and Sediment Sciences of Ministry of Education and State Key Laboratory of Regional Environment and Sustainability, School of Environment, Beijing Normal University, Beijing, China.
Global change biology
|March 18, 2025
概括
人类活动显著增加了内陆水域的温室气体 (GHG) 排放量,特别是甲和氧化. 了解这些影响对于有效的气候变化减缓战略至关重要.
科学领域:
- 环境科学 环境科学
- 生物地质化学生物地质化学
- 气候变化研究 气候变化研究
背景情况:
- 内陆水是全球碳循环的关键组成部分,也是温室气体 (GHG) 的重要来源.
- 人类活动越来越多地主导着景观,但它们对内陆水生系统温室气体排放的具体影响尚未完全理解.
- 以前的研究表明人类的影响,但在不同的人类主导的景观中缺乏全面的综合.
研究的目的:
- 综合现有的关于农业,城市和封存河流系统内陆水域温室气体排放的研究.
- 量化人类活动增加或改变内陆水域二氧化碳 (CO2),甲 (CH4) 和氧化 (N2O) 排放的程度.
- 确定推动这些人为引起的水生温室气体排放变化的关键生物地质化学机制.
主要方法:
- 综合了来自三个不同的人类主导的景观类型的研究成果:农业,城市和被扣留的河流系统.
- 从受人类影响的内陆水域到自然/半自然环境的温室气体排放率 (CO2,CH4,N2O) 的比较分析.
- 识别和分析导致温室气体排放变化的因素,包括沉积物,碳和营养投入,以及水生无氧.
主要成果:
- 人类占据主导地位的内陆水域的温室气体排放量与自然系统相比显著更高.
- 对CH4和N2O排放的中位增强比分分别为2.010和2.413.
- 二氧化碳排放的增强率较低 (中位数比率<2.03.1),往往是由于高化而增加光合作用而抵消.
- 增加的沉积物,碳和营养投入,以及扩大的水生无氧,推动了这些排放变化.
结论:
- 人类活动对内陆水的温室气体排放和潜在的生物地质化学过程产生重大影响.
- 由于人类影响而改变的温室气体排放率和内陆水资源丰度/分布的变化需要进一步量化.
- 精确量化和减轻人类对水生温室气体排放的影响,需要考虑到讨论的变化和机制.
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