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| Response of soil N2O emissions to precipitation pulsesunder different nitrogen availabilities in a semiarid temperate steppe of Inner Mongolia, China |
| XinChao LIU1,2, YuChun QI1, YunShe DONG1*, Qin PENG1, YaTing HE1, 3, LiangJie SUN1, 2, JunQiang JIA1,2, CongCong CAO1,2 |
1 Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Institute of Agricultural Resources and Regional Planning, CAAS, Beijing 100081, China |
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Abstract Short-term nitrous oxide (N2O) pulse emissions caused by precipitation account for a considerable portion of the annual N2O emissions and are greatly influenced by soil nitrogen (N) dynamics. However, in Chinese semiarid temperate steppes, the response of N2O 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 tem-perate typical steppe of Inner Mongolia, China, to investigate the N2O emission pulses resulting from artificial pre-cipitation events (approximately equivalent to 10.0 mm rainfall) under four N addition levels (0, 5, 10, and 20 g N/(m2•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). No significant increase was observed for either the N2O peak effluxes or the weekly cumulative emissions (P>0.05) with single water addition. The peak values of N2O efflux increased with the increasing N input. Only the treatments with water and medium (WN10) or high N addition (WN20) significantly increased the cumula-tive N2O emissions (P<0.01) in both experimental periods. Under drought condition, the variations in soil N2O 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 N2O pulse emissions, particu-larly the N2O 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 N2O emission pulses in semiarid grasslands.
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Received: 13 June 2013
Published: 12 August 2014
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XinChao LIU, YuChun QI, YunShe DONG, Qin PENG, YaTing HE, LiangJie SUN, JunQiang JIA, CongCong CAO. Response of soil N2O emissions to precipitation pulsesunder different nitrogen availabilities in a semiarid temperate steppe of Inner Mongolia, China. Journal of Arid Land, 2014, 6(4): 410-422.
URL:
http://jal.xjegi.com/10.1007/s40333-013-0211-x OR http://jal.xjegi.com/Y2014/V6/I4/410
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