Response of soil greenhouse gas emissions to different forms of nitrogen in alpine shrub ecosystems

doi:10.11686/cyxb20150302

Abstract

Abstract: In order to understand the effects of N addition with different chemical forms on greenhouse gas (CO₂, N₂O and CH₄) emission from the alpine shrub meadow on Qinghai-Tibetan Plateau. Four treatments including a control (CK), no nitrogen plus three forms of nitrogen (NH₄Cl, NH₄NO₃, KNO₃) were applied in Hongyuan County, eastern Qinghai-Tibetan Plateau. A composite sample of the top 15 cm of soil taken from each treatment was incubated at the lab at 15℃. Emissions of CO₂, CH₄ and N₂O from the incubated soil and the soil mineral nitrogen (NH₄⁺ and NO₃^-) and dissolved organic carbon (DOC) were determined. The results showed that all the nitrogen addition treatments inhibited soil CO₂ emission which was significantly, positively correlated with soil DOC concentration. Addition of nitrogen significantly increased soil N₂O emissions, the highest N₂O emissions were found with NO₃^--N addition. There were no treatment differences in soil CH₄ absorption. The results suggest that application of NH₄⁺-N rather than NO₃^--N will reduce greenhouse gas emissions in Tibetan alpine shrub ecosystems.

MA Gang, WANG Ping, WANG Dongxue, XU Shiquan. Response of soil greenhouse gas emissions to different forms of nitrogen in alpine shrub ecosystems[J]. Acta Prataculturae Sinica, 2015, 24(3): 20-29.

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