Nitrogen deposition increases N2O emission in an alpine wetland in the arid region of Northwest China
Received date: 2022-01-14
Revised date: 2022-06-13
Online published: 2022-10-25
With the basis of climate change, nitrogen deposition will have an impact on N2O emissions between the soil and atmosphere in the alpine wetland in the arid region of Northwest China. Taking the alpine wetland at Swan Lake of Bayinbuluke in the middle of Tianshan Mountain as a study area, three nitrogen addition treatments (0, 10, and 20 kg·hm-2·a-1) were set in different water conditions (perennial seeper area, seasonal water area, and perennial dry area). The measurement of N2O was made via static chamber-gas chromatography during the growing season. The relationship between N2O emissions and main environmental factors was explored. The results showed that the following: (1) increased N significantly contributed to N2O emissions under different water conditions in the alpine wetland ecosystem (P < 0.05). Under 0 kg·hm-2·a-1 treatment, the N2O accumulation showed an uptake from the ecosystem with the growing season. Under 10 and 20 kg·hm-2·a-1 treatments, the N2O accumulation were emitted. The cumulative N2O emissions increased significantly when nitrogen deposition increased in different water conditions. Increased nitrogen deposition influenced the wetland ecosystem from N2O to sink to the N2O source. (2) nitrogen application significantly affected the rate of N2O emissions from the ecosystem (P < 0.01). In seasonal water area, the relationship between the average N2O emission rate (F), nitrogen addition (N), and soil temperature (T) at a depth of 5 cm was in accordance with the multiple first-order equation (F = -2.763 + 0.209N + 0.151T, R2 = 0.483, P < 0.01). Therefore, N deposition increases N2O emissions in the alpine wetland in the arid region of Northwest China.
Key words： nitrogen deposition; N2O; ecosystem; water conditions; alpine wetland
SHEN Zhibo,HAN Yaoguang,WANG Jiali,CHEN Kangyi,HU Yang,ZHU Xinping,JIA Hongtao . Nitrogen deposition increases N2O emission in an alpine wetland in the arid region of Northwest China[J]. Arid Zone Research, 2022 , 39(5) : 1655 -1662 . DOI: 10.13866/j.azr.2022.05.29
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