Depth-dependent greenhouse gas production and consumption in an upland cropping system in northern China
Depth-dependent greenhouse gas production and consumption in an upland cropping system in northern China
复制标题
中国北方旱作制度中深度依赖的温室气体产生和消耗
DOI：
10.1016/j.geoderma.2018.01.001
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发表时间：
2018-06
期刊：
影响因子：
6.1
通讯作者：
Luo Yiqi
中科院分区：
文献类型：
--
作者：
Wang Yuying;Li Xiaoxin;Dong Wenxu;Wu Dianming;Hu Chunsheng;Zhang Yuming;Luo Yiqi
土壤中温室气体(GHG)产生和消耗的垂直剖面尚未仔细量化。本研究的目的是量化土壤剖面中CO2、CH4和N2O通量对土壤表层气体交换的深度贡献。采用静态箱法(CM)和浓度梯度法(GM)对北方旱地玉米种植系统的土壤表层温室气体排放和地下通量(0~115 cm)进行了连续两年的同步观测，发现未施肥的玉米地作为CO2源，CH4和N2O汇。土壤表层呼吸主要来自0~15 cm土层，CH4和N2O消耗分别来自0~40 cm和0~15 cm土层。土壤表层呼吸主要来自0-5和5-15 cm土层，分别占地表交换总量的70.9%和27.3%。0~5 cm、5~15 cm和15~40 cm的甲烷消耗量分别占地表交换总量的54.1%、32.3%和12.1%。0~5 cm和5~15 cm土层的N2O消耗量分别占地表交换总量的80.4%和6.6%。15 cm以下土壤对CO2的缓冲作用较大，40 cm以下CH4和15 cm以下N2O的生产/消费潜力很弱。综上所述，我们的研究结果表明，在中国北部的太行山区，表层土壤(0-40 cm)对玉米旱地CO2的产生和CH4、N2O的消耗起着关键作用。然而，土壤孔隙中储存的温室气体变化的机制尚不清楚，需要进一步的观测和实验研究才能了解这些过程。
Vertical profiles of greenhouse gas (GHG) production and consumption within soils have not been carefully quantified. The objective of this study was to quantify the depth-dependent contributions of CO2, CH4and N2O fluxes in the soil profile to soil surface gas exchange. We simultaneously measured the soil surface GHG emissions and the subsurface fluxes (0–115 cm) in situ by using a static chamber-based method (CM) and a concentration gradient-based method (GM) respectively, over two-year period in a maize-based upland cropping system in northern China.We found that unfertilized maize-based farmland acted as CO2sources and CH4and N2O sinks. Soil surface respiration was mostly contributed by the 0–15 cm horizon; while CH4and N2O consumption originated from the 0–40 and 0–15 cm soil horizons, respectively. Specifically, we revealed that the soil surface respiration was contributed by the 0–5 and 5–15 cm horizons, accounting for 70.9 and 27.3% of the surface exchange, respectively. The CH4consumption at 0–5, 5–15 and 15–40 cm depths accounted for 54.1, 32.3 and 12.1% of the surface exchange, respectively. And the N2O consumption at 0–5 and 5–15 cm depths accounted for 80.4 and 6.6% of the surface exchange, respectively. The subsoil below 15 cm acted largely as a CO2buffer; the production/consumption potentials of CH4and N2O were very weak below 40 and 15 cm depths, respectively. In conclusion, our results highlight that the topsoil (0–40 cm) plays a critical role in CO2production and CH4and N2O consumption in an unfertilized maize-based farmland in Taihang mountain areas of northern China. However, the mechanisms responsible for changes in stored greenhouse gas within soil pore space are not clear, and further observational and experimental research is required to understand those processes.
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影响因子：
9.7
作者：
R. Ye;W. Horwath
通讯作者：
R. Ye;W. Horwath
DOI：
10.1007/s11267-007-9165-3
发表时间：
2008-04
期刊：
Water, Air, & Soil Pollution: Focus
影响因子：
--
作者：
S. Reth;W. Graf;O. Gefke;R. Schilling;H. Seidlitz;J. Munch
通讯作者：
S. Reth;W. Graf;O. Gefke;R. Schilling;H. Seidlitz;J. Munch
DOI：
10.2136/sssaj1998.03615995006200010005x
发表时间：
1998-01-01
影响因子：
2.9
作者：
Chang, C;Janzen, HH;Nakonechny, EM
通讯作者：
Nakonechny, EM
影响因子：
2.2
作者：
M. Castro;J. Melillo;P. Steudler;Jon W. Chapman
通讯作者：
M. Castro;J. Melillo;P. Steudler;Jon W. Chapman
DOI：
10.2136/sssaj1993.03615995005700040005x
发表时间：
1993-07
影响因子：
2.9
作者：
Jörg Zausig;W. Stepniewski;R. Horn
通讯作者：
Jörg Zausig;W. Stepniewski;R. Horn