Liu Xinchao; Qi Yuchun; Dong Yunshe; Peng Qin; He Yating; Sun Liangjie; Jia Junqiang; Cao Congcong
Source Publicationjournalofaridland
AbstractShort-term nitrous oxide(N_2O) pulse emissions caused by precipitation account for a considerable portion of the annual N_2O emissions and are greatly influenced by soil nitrogen(N) dynamics. However, in Chinese semiarid temperate steppes, the response of N_2O emissions to the coupling changes of precipitation and soil N availability is not yet fully understood. In this study, we conducted two 7-day field experiments in a semiarid temperate typical steppe of Inner Mongolia, China, to investigate the N_2O emission pulses resulting from artificial precipitation events(approximately equivalent to 10.0 mm rainfall) under four N addition levels(0, 5, 10 and 20 g N/(m~2·a)) using the static opaque chamber technique. The results show that the simulated rainfall during the dry period in 2010 caused greater short-term emission bursts than that during the relatively rainy observation period in 2011(P 0.05) with single water addition. The peak values of N_2O efflux increased with the increasing N input. Only the treatments with water and medium(WN10) or high N addition(WN_20) significantly increased the cumulative N_2O emissions(P<0.01) in both experimental periods. Under drought condition, the variations in soil N_2O effluxes were positively correlated with the soil NH4-N concentrations in the three N input treatments(WN5, WN10, and WN20). Besides, the soil moisture and temperature also greatly influenced the N_2O pulse emissions, particularly the N_2O pulse under the relatively rainy soil condition or in the treatments without N addition(ZN and ZWN). The responses of the plant metabolism to the varying precipitation distribution and the length of drought period prior to rainfall could greatly affect the soil N dynamics and N_2O emission pulses in semiarid grasslands.
Document Type期刊论文
First Author Affilication中国科学院地理科学与资源研究所
Recommended Citation
GB/T 7714
Liu Xinchao,Qi Yuchun,Dong Yunshe,et al. responseofsoiln2oemissionstoprecipitationpulsesunderdifferentnitrogenavailabilitiesinasemiaridtemperatesteppeofinnermongoliachina[J]. journalofaridland,2014,6(4):410.
APA Liu Xinchao.,Qi Yuchun.,Dong Yunshe.,Peng Qin.,He Yating.,...&Cao Congcong.(2014).responseofsoiln2oemissionstoprecipitationpulsesunderdifferentnitrogenavailabilitiesinasemiaridtemperatesteppeofinnermongoliachina.journalofaridland,6(4),410.
MLA Liu Xinchao,et al."responseofsoiln2oemissionstoprecipitationpulsesunderdifferentnitrogenavailabilitiesinasemiaridtemperatesteppeofinnermongoliachina".journalofaridland 6.4(2014):410.
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