Spatial variability of N2O, CH4 and CO2 fluxes within the Xilin River catchment of Inner Mongolia, China: a soil core study
Spatial variability of N2O, CH4 and CO2 fluxes within the Xilin River catchment of Inner Mongolia, China: a soil core study
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内蒙古锡林河流域 N2O、CH4 和 CO2 通量的空间变异：土壤核心研究
DOI：
10.1007/s11104-009-0257-x
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发表时间：
2010-06
期刊：
影响因子：
--
通讯作者：
刘春岩
中科院分区：
文献类型：
--
作者：
刘春岩
为明确土地利用/覆被类型、土壤类型和土壤性质对半干旱草原土壤-大气温室气体交换的影响，并为估算半干旱草原夏季温室气体收支提供可靠依据，对内蒙古锡林河上游30个典型样点的土壤柱样进行了氧化亚氮（N2 O）、甲烷（CH 4）和二氧化碳（CO2）通量的测定。所有调查地点的土壤N2 O排放量范围为0.18至21.8 μg N m-2 h-1，平均值为3.4 μg N m-2 h-1，变异系数（CV，表示为一个标准差与平均值的百分比）高达130%。CH 4通量范围为-88.6 ~2，782.8 μg C m-2 h-1（CV为849%）。仅从一个沼泽地取样点观测到CH 4净排放，而所有其他29个调查点均显示出CH 4净吸收（平均值：-33.3 μg C m-2 h-1）。所有站点的CO2排放量范围为3.6至109.3 mg C m-2 h-1，平均值为37.4 mg C m-2 h-1，CV为66%。土壤水分主要正向调节N2 O和CO2排放的空间变异（R2 = 0.15-0.28，P0.05）。土壤无机氮含量对N2 O排放的空间变异也有显著影响（P0.05）。通过简单地将不同土地利用/覆盖类型的现场测量结果扩大到整个集水区（3，900平方公里），在采样时（2007年仲夏），N2 O、CH 4和CO2的通量估计分别为29 t CO2-C-eq d-1、-26 t CO2-C-eq d-1和3，223 t C d-1。这表明，在评估的空间变异性的温室气体总通量从土壤在半干旱集水区/区域，密集的研究可能会集中在CO2交换，这是主导全球变暖的潜在仲夏土壤-大气温室气体通量。此外，盛夏的平均温室气体通量，加权面积范围内的这些土地利用/覆盖类型在该地区，约为-30.0微克C m-2 h-1的甲烷，2.4微克N m-2 h-1的N2 O和34.5毫克C m-2 h-1的CO2。
In order to identify the effects of land-use/cover types, soil types and soil properties on the soil-atmosphere exchange of greenhouse gases (GHG) in semiarid grasslands as well as provide a reliable estimate of the midsummer GHG budget, nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2) fluxes of soil cores from 30 representative sites were determined in the upper Xilin River catchment in Inner Mongolia. The soil N2O emissions across all of the investigated sites ranged from 0.18 to 21.8 μg N m-2 h-1, with a mean of 3.4 μg N m-2 h-1 and a coefficient of variation (CV, which is given as a percentage ratio of one standard deviation to the mean) as large as 130%. CH4 fluxes ranged from -88.6 to 2,782.8 μg C m-2 h-1 (with a CV of 849%). Net CH4 emissions were only observed from cores taken from a marshland site, whereas all of the other 29 investigated sites showed net CH4 uptake (mean: -33.3 μg C m-2 h-1). CO2 emissions from all sites ranged from 3.6 to 109.3 mg C m-2 h-1, with a mean value of 37.4 mg C m-2 h-1 and a CV of 66%. Soil moisture primarily and positively regulated the spatial variability in N2O and CO2 emissions (R2 = 0.15–0.28, P < 0.05). The spatial variation of N2O emissions was also influenced by soil inorganic N contents (P < 0.05). By simply up-scaling the site measurements by the various land-use/cover types to the entire catchment area (3,900 km2), the fluxes of N2O, CH4 and CO2 at the time of sampling (mid-summer 2007) were estimated at 29 t CO2-C-eq d-1, -26 t CO2-C-eq d-1 and 3,223 t C d-1, respectively. This suggests that, in terms of assessing the spatial variability of total GHG fluxes from the soils at a semiarid catchment/region, intensive studies may focus on CO2 exchange, which is dominating the global warming potential of midsummer soil-atmosphere GHG fluxes. In addition, average GHG fluxes in midsummer, weighted by the areal extent of these land-use/cover types in the region, were approximately -30.0 μg C m-2 h-1 for CH4, 2.4 μg N m-2 h-1 for N2O and 34.5 mg C m-2 h-1 for CO2.
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半干旱草原水在调节土壤和微生物呼吸中的主导作用及其对气候变化的响应
影响因子：
11.6
作者：
Liu, Weixing;Zhang, Zhe;Wan, Shiqiang
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影响因子：
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作者：
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影响因子：
4.9
作者：
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Zhang, Tao
影响因子：
4.9
作者：
Mark A. Williams;C. Rice;C. Owensby
通讯作者：
Mark A. Williams;C. Rice;C. Owensby
影响因子：
4.9
作者：
J. Holst;C. Liu;Z. Yao;N. Brüggemann;X. Zheng;X. Han;K. Butterbach‐Bahl
通讯作者：
J. Holst;C. Liu;Z. Yao;N. Brüggemann;X. Zheng;X. Han;K. Butterbach‐Bahl