小兴安岭典型苔草和灌木沼泽N2O排放通量日变化研究

doi:10.14088/j.cnki.issn0439-8114.2020.11.006

摘要/Abstract

摘要： 探明小兴安岭修氏苔草（Carex schmidtii）沼泽和油桦-修氏苔草（Betula ovalifolia-Carex schmidtii）灌木沼泽N₂O排放通量日变化动态, 可为山地沼泽N₂O排放季节动态及总量估算提供基础数据。因此, 于生长季初期（2008年6月4~5日）、中期（2007年8月4~5日）和末期（2007年9月24~25日）, 在小兴安岭苔草和灌木沼泽中, 采用静态暗箱—气相色谱法, 在晴天观测了N₂O排放通量。两种沼泽N₂O排放通量日变化在生长季中期呈现昼高夜低规律, 末期和初期的日排放规律性不显著。生长季中期和初期, 苔草沼泽N₂O日排放通量最高值出现在9：00, 末期最高值出现在3：00;生长季初期和末期的最低值出现在21：00, 中期最低值出现在18：00。生长季初期、中期和末期, 灌木沼泽N₂O日排放通量最高值分别出现在9：00、15：00和6：00;最低值分别出现在3：00、21：00和18：00。两种沼泽生长季初期为N₂O的吸收汇, 中期和末期为弱排放源。灌木沼泽的N₂O日排放通量明显高于苔草沼泽。生长季初期和末期, 两种沼泽N₂O日排放通量与温度呈负相关, 中期呈正相关。其中, 苔草沼泽N₂O日排放通量与10 cm土温呈现显著负相关, 灌木沼泽与15 cm土温呈现显著负相关。苔草沼泽N₂O日排放通量与地表温度呈现显著正相关, 灌木沼泽与40 cm土温呈现显著正相关。据此, 小兴安岭苔草沼泽和灌木沼泽为N₂O排放弱源或吸收汇, 温度、水位和植被类型是N₂O日排放通量的主要影响因素。

关键词: N₂O排放通量, 日变化, 修氏苔草沼泽, 油桦—修氏苔草灌木沼泽;, 温度, 小兴安岭

Abstract: In order to provide basic data for seasonal dynamics and total amount estimation of N₂O emission from mountain marshes, this study was performed to understand the diurnal variation of N₂O emission fluxes from Carex schmidtii marsh and Betula ovalifolia-Carex schmidtii shrub swamp in Xiaoxing'an Mountains. An experiment was conducted to observe the diurnal variation of N₂O fluxes in marsh and shrub swamp in Xiaoxing'an Mountains using the static opaque chamber and gas chromatography techniques on August 4-5 of 2007, September 24-25 of 2007, and June 4-5 of 2008. The results showed that the diurnal variation of N₂O emission flux in two kinds of marshes showed a diurnal high-night low pattern on August 4-5 of 2007, the daily emission regularity is not significant on September 24-25 of 2007 and June 4-5 of 2008. The highest N₂O fluxes in marsh were appeared at 9：00 on August 4-5 of 2007 and June 4-5 of 2008, and appeared at 3：00 on September 24-25 of 2007. The lowest N₂O fluxes in marsh were appeared at 21：00 on June 4-5 of 2008 and September 24-25 of 2007, and appeared at 18：00 on August 4-5 of 2007. The highest N₂O fluxes in shrub swamp were appeared at 15：00 on August 4-5 of 2007 and appeared at 6：00 on September 24-25 of 2007, and appeared at 9：00 on June 4-5 of 2008. The lowest N₂O fluxes in shrub swamp were appeared at 21：00 on August 4-5 of 2007, and appeared at18：00 on September 24-25 of 2007 and appeared at 3：00 on June 4-5 of 2008. Two kinds of marshes were the absorption sinks of N₂O on June 4-5 of 2008, and were the weak emission sources on August4 -5 and September 24 to 25, 2007. The diurnal variation N₂O fluxes of shrub swamp were higher than those of marsh. The daily N₂O emission flux of two kinds of marshes were negatively correlated with temperature on September 24-25 of 2007 and June 4-5 of 2008, and were Positive correlation with temperature on August 4-5 of 2007. Among them, the daily N₂O emission fluxes of marsh were negatively correlated with 10 cm soil temperature, while that of shrub swamp were negatively correlated with 15 cm soil temperature. The diurnal N₂O emission fluxes of marsh were positively correlated with surface temperature, while that of shrub swamp were positively correlated with 40 cm soil temperature. The marsh and shrub swamp in Xiaoxing'an Mountains were weak sources or sinks of N₂O emission, the temperature, water level and vegetation types were the main influencing factors of N₂O daily emission fluxes.

Key words: N₂O fluxes, diurnal variation, Carex schmidtii marshes, Betula ovalifolia-Carex schmidtii shrub swamp, temperature, Xiaoxing'an Mountains

中图分类号:

X173

石兰英, 牟长城, 孙晓新. 小兴安岭典型苔草和灌木沼泽N₂O排放通量日变化研究[J]. 湖北农业科学, 2020, 59(11): 31-33.

SHI Lan-ying, MU Chang-cheng, SUN Xiao-xin. Diurnal variation of N₂O fluxes in the typical marsh and shrub swamp in Xiaoxing'an Mountains[J]. HUBEI AGRICULTURAL SCIENCES, 2020, 59(11): 31-33.

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小兴安岭典型苔草和灌木沼泽N₂O排放通量日变化研究

Diurnal variation of N₂O fluxes in the typical marsh and shrub swamp in Xiaoxing'an Mountains

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