DOI: 10.1111/gcb.13944
Scopus记录号: 2-s2.0-85035239816
论文题名: Impacts of climate and land use on N2O and CH4 fluxes from tropical ecosystems in the Mt. Kilimanjaro region, Tanzania
作者: Gütlein A. ; Gerschlauer F. ; Kikoti I. ; Kiese R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 3 起始页码: 1239
结束页码: 1255
语种: 英语
英文关键词: CH4 uptake
; land use change
; N cycling
; N2O emission
; soil
; tropical ecosystems
Scopus关键词: agroforestry
; arable land
; climate effect
; land use change
; methane
; mountain region
; nitrogen cycle
; nitrous oxide
; savanna
; tropical forest
; tropical region
; Kilimanjaro [Kilimanjaro (RGA)]
; Kilimanjaro [Tanzania]
; Tanzania
; Zea mays
英文摘要: In this study, we quantify the impacts of climate and land use on soil N2O and CH4 fluxes from tropical forest, agroforest, arable and savanna ecosystems in Africa. To do so, we measured greenhouse gases (GHG) fluxes from 12 different ecosystems along climate and land-use gradients at Mt. Kilimanjaro, combining long-term in situ chamber and laboratory soil core incubation techniques. Both methods showed similar patterns of GHG exchange. Although there were distinct differences from ecosystem to ecosystem, soils generally functioned as net sources and sinks for N2O and CH4 respectively. N2O emissions correlated positively with soil moisture and total soil nitrogen content. CH4 uptake rates correlated negatively with soil moisture and clay content and positively with SOC. Due to moderate soil moisture contents and the dominance of nitrification in soil N turnover, N2O emissions of tropical montane forests were generally low (<1.2 kg N ha−1 year−1), and it is likely that ecosystem N losses are driven instead by nitrate leaching (~10 kg N ha−1 year−1). Forest soils with well-aerated litter layers were a significant sink for atmospheric CH4 (up to 4 kg C ha−1 year−1) regardless of low mean annual temperatures at higher elevations. Land-use intensification significantly increased the soil N2O source strength and significantly decreased the soil CH4 sink. Compared to decreases in aboveground and belowground carbon stocks enhanced soil non-CO2 GHG emissions following land-use conversion from tropical forests to homegardens and coffee plantations were only a small factor in the total GHG budget. However, due to lower ecosystem carbon stock changes, enhanced N2O emissions significantly contributed to total GHG emissions following conversion of savanna into grassland and particularly maize. Overall, we found that the protection and sustainable management of aboveground and belowground carbon and nitrogen stocks of agroforestry and arable systems is most crucial for mitigating GHG emissions from land-use change. © 2017 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110505
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Institute of Meteorology and Climate Research, Atmospheric Environmental Research, Karlsruhe Institute of Technology, Garmisch-Partenkirchen, Germany; Tanzania National Parks, Arusha, Tanzania
Recommended Citation:
Gütlein A.,Gerschlauer F.,Kikoti I.,et al. Impacts of climate and land use on N2O and CH4 fluxes from tropical ecosystems in the Mt. Kilimanjaro region, Tanzania[J]. Global Change Biology,2018-01-01,24(3)