| DOI: | 10.2172/1248029
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| 报告号: | DOE-Smithsonian--08165
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| 报告题名: | Cryptic Methane Emissions from Upland Forest Ecosystems |
| 作者: | Megonigal, Patrick; Pitz, Scott
|
| 出版年: | 2016
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| 发表日期: | 2016-04-19
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| 总页数: | 17
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| 国家: | 美国
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| 语种: | 英语
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| 英文关键词: | Methane emissions
|
| 中文主题词: | 大气科学
; 土壤
; 排放物
; 森林
; 甲烷
; 生物化学过程
|
| 主题词: | ATMOSPHERE
; SOILS
; EMISSIONS
; FORESTS
; METHANE
; BIOGEOCHEMICAL PROCESSES
|
| 英文摘要: | This exploratory research on Cryptic Methane Emissions from Upland Forest Ecosystems was motivated by evidence that upland ecosystems emit 36% as much methane to the atmosphere as global wetlands, yet we knew almost nothing about this source. The long-term objective was to refine Earth system models by quantifying methane emissions from upland forests, and elucidate the biogeochemical processes that govern upland methane emissions. The immediate objectives of the grant were to: (i) test the emerging paradigm that upland trees unexpectedly transpire methane, (ii) test the basic biogeochemical assumptions of an existing global model of upland methane emissions, and (iii) develop the suite of biogeochemical approaches that will be needed to advance research on upland methane emissions. We instrumented a temperate forest system in order to explore the processes that govern upland methane emissions. We demonstrated that methane is emitted from the stems of dominant tree species in temperate upland forests. Tree emissions occurred throughout the growing season, while soils adjacent to the trees consumed methane simultaneously, challenging the concept that forests are uniform sinks of methane. High frequency measurements revealed diurnal cycling in the rate of methane emissions, pointing to soils as the methane source and transpiration as the most likely pathway for methane transport. We propose the forests are smaller methane sinks than previously estimated due to stem emissions. Stem emissions may be particularly important in upland tropical forests characterized by high rainfall and transpiration, resolving differences between models and measurements. The methods we used can be effectively implemented in order to determine if the phenomenon is widespread. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1248029
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| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/42154
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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Content Type |
Version |
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| 1248029.pdf（1175KB） | 研究报告 | -- | 开放获取 | | View
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| Recommended Citation: | |
Megonigal, Patrick,Pitz, Scott. Cryptic Methane Emissions from Upland Forest Ecosystems. 2016-01-01.
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