首页|Nitrous oxide emissions from different land use patterns in a typical karst region, Southwest China

Nitrous oxide emissions from different land use patterns in a typical karst region, Southwest China

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Fluxes of nitrous oxide (N2O) from different land use patterns (matured forest,secondary forest,grassland and cropland) in a subtropical karst region of Guizhou Province,Southwest China,were measured for one year with a closed static chamber technique and by gas chromatography.The results showed that soil under different land uses was a source of atmospheric N2O.The cropland was a source with relatively high N2O as compared to forest and grassland,but no significant differences were observed.N2O emissions from soils varied with land use change and fertilizer application.There were two peaks of N2O flux occurred following the combination of two obvious precipitation and fertilizer events in the cultivated land.Converting from the matured forest to secondary forest tended to increase annual emissions of N2O (from 1.40 to 1.65 kg N ha-1 a-1),while changing land use from secondary forest to scattered grassland tended to decrease annual emissions of N2O slightly (from 1.65 to 1.45 kg N ha-1 a-1).Our range of cumulative annual N2O emission across different land uses (1.40-1.91 kg N ha1 a-1) in a karst region is in general agreement with previously published data in a non-karst region.However,in the maize field,N2O emission factor (EF) was 0.34％ for fertilizer application,which is about 71.2％ lower than the IPCC default value.It is suggested that current IPCC (Intergovernmental Panel on Climate Change) EF methodology could overestimate N2O emission from the karstic cropland.Anyway,the N2O emission from cropland in the karst region would contribute significantly to the global N2O budget,so reducing fertilization frequency during the crop growing season could lead to a decrease in N2O emission in the whole year.

karst regionN2O emissiongrasslandpine forestmaize field

CHENG Jianzhong、LEE Xinqing、ZHOU Zhihong、WANG Bing、XING Ying、CHENG Hongguang

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State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

Graduate University of Chinese Academy of Sciences, Beijing 100049, China

This work is financially supported jointly by the National Natural Science Foundation of ChinaThis work is financially supported jointly by the National Natural Science Foundation of ChinaThis work is financially supported jointly by the National Natural Science Foundation of ChinaKey Agriculture R & D Program of Guizhou ProvinceStrategic Priority Research Program of the Chinese Academy of SciencesNatural Science Foundation of Guizhou Province

4102106240872212411030783079XDA050704002054

2013

10.1007/s11631-013-0616-4

地球化学学报(英文版)
中国科学院地球化学研究所

地球化学学报(英文版)

CSCDEI
影响因子：0.33
ISSN：2096-0956
年,卷(期)：2013.32(2)
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