Diurnal Variation of Soil N2O Emission Fluxes and Its Influencing Factors in Pinus tabulaeformis Plantation

doi:10.13466/j.cnki.lyzygl.2023.02.012

Abstract

Abstract:

In the context of global warming,the diurnal variation of annual soil N₂O emission flux in Pinus tabulaeformis plantation was revealed,and the optimal daily sampling period was determined based on the daily dynamic data of N₂O emission flux observation,which provided basic data for accurate assessment of regional soil N₂O flux.The N₂O emission fluxes in the growing season and freezing-thawing period of Pinus tabulaeformis plantation in 2020—2021 were measured by static box gas chromatography (GC).The results showed as follows:1) During the growing season (June-September 2020),the average N₂O emission flux of the observation days all appeared during 15:00—17:00 of the same day;During freeze-thaw period (November 2020 to March next year),the observed values from 8:00 to 12:00 on the observation day were close to the daily mean value of N₂O flux.2) In 2021,the average N₂O emission flux of observation days appeared in the period of 7:00—9:00 on July days and 15:00—17:00from June days to September days.According to the results,the best sampling time of N₂O in Pinus tabulaeformis plantation in Daqing Mountain was 9:00 AM or 15:00 PM in the growing season and 8:00 am in the freezing-thawing period.The obtained flux value could represent the average N₂O flux of the day after correction.According to the analysis results,temperature in the growing season and the freeze-thaw period and the N₂O emission flux effect value,it can be determined that temperature is an important factor for the N₂O emission of Pinus tabulaeformis plantation in Daqing Mountain.

Key words: Pinus tabulaeformis plantation, N₂O emission flux, soil temperature, diurnal variation, monthly variation

CLC Number:

LI Xiaoyang, MA Xiuzhi, YANG Yupei, LI Changsheng. Diurnal Variation of Soil N₂O Emission Fluxes and Its Influencing Factors in Pinus tabulaeformis Plantation[J]. FOREST RESOURCES WANAGEMENT, 2023, 0(2): 88-95.

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时间段	N₂O通量	6月	7月	8月	9月
日均	2020年N₂O通量/	8.63±4.08	8.71±4.14	14.65±4.30	10.89±2.57
9:00	[μg/(m²·h)]	19.28(+10.65)	4.80(-3.91)	18.11(+3.46)	15.72(+4.83)
15:00		6.98(-1.65)	7.55(-1.16)	14.92(+0.67)	11.71(+0.82)
日均	2021年N₂O通量/	4.02±1.44	8.64±4.61	7.84±3.75	6.15±4.19
9:00	[μg/(m²·h)]	2.61(-1.41)	7.09(-1.55)	7.09(-0.75)	18.45(+12.3)
15:00		2.41(-1.61)	7.08(-1.56)	5.61(-2.23)	7.06(+0.91)

Diurnal Variation of Soil N₂O Emission Fluxes and Its Influencing Factors in Pinus tabulaeformis Plantation

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