Qi Yuchun1; Liu Xinchao1; Dong Yunshe1; Peng Qin1; He Yating2; Sun Liangjie1; Jia Junqiang1; Cao Congcong1
Source Publicationjournalofenvironmentalsciences
AbstractWe examined the effects of simulated rainfall and increasing N supply of different levels on CO2 pulse emission from typical Inner Mongolian steppe soil using the static opaque chamber technique, respectively in a dry June and a rainy August. The treatments included NH4NO3 additions at rates of 0, 5, 10, and 20 g N/(m(2)center dot year) with or without water. Immediately after the experimental simulated rainfall events, the CO2 effluxes in the watering plots without N addition (WCK) increased greatly and reached the maximum value at 2 hr. However, the efflux level reverted to the background level within 48 hr. The cumulative CO2 effluxes in the soil ranged from 5.60 to 6.49 g C/m(2) over 48 hr after a single water application, thus showing an increase of approximately 148.64% and 48.36% in the effluxes during both observation periods. By contrast, the addition of different N levels without water addition did not result in a significant change in soil respiration in the short term. Two-way ANOVA showed that the effects of the interaction between water and N addition were insignificant in short-term soil CO2 effluxes in the soil. The cumulative soil CO2 fluxes of different treatments over 48 hr accounted for approximately 5.34% to 6.91% and 2.36% to 2.93% of annual C emission in both experimental periods. These results stress the need for improving the sampling frequency after rainfall in future studies to ensure more accurate evaluation of the grassland C emission contribution.
Funding Project[Knowledge Innovation Program of the Chinese Academy of Sciences] ; [National Natural Science Foundation of China] ; [Special Fund for Agro-scientific Research in the Public Interest]
Document Type期刊论文
2.Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences
First Author Affilication中国科学院地理科学与资源研究所
Recommended Citation
GB/T 7714
Qi Yuchun,Liu Xinchao,Dong Yunshe,et al. differentialresponsesofshorttermsoilrespirationdynamicstotheexperimentaladditionofnitrogenandwaterinthetemperatesemiaridsteppeofinnermongoliachina[J]. journalofenvironmentalsciences,2014,26(4):834.
APA Qi Yuchun.,Liu Xinchao.,Dong Yunshe.,Peng Qin.,He Yating.,...&Cao Congcong.(2014).differentialresponsesofshorttermsoilrespirationdynamicstotheexperimentaladditionofnitrogenandwaterinthetemperatesemiaridsteppeofinnermongoliachina.journalofenvironmentalsciences,26(4),834.
MLA Qi Yuchun,et al."differentialresponsesofshorttermsoilrespirationdynamicstotheexperimentaladditionofnitrogenandwaterinthetemperatesemiaridsteppeofinnermongoliachina".journalofenvironmentalsciences 26.4(2014):834.
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