油松人工林土壤N2O排放通量的昼夜变化规律及其影响因子
收稿日期: 2023-02-01
修回日期: 2023-04-23
网络出版日期: 2023-06-26
基金资助
内蒙古自然科学基金(2022MS03054)
Diurnal Variation of Soil N2O Emission Fluxes and Its Influencing Factors in Pinus tabulaeformis Plantation
Received date: 2023-02-01
Revised date: 2023-04-23
Online published: 2023-06-26
在全球气候变暖的背景下,揭示大青山油松人工林全年土壤N2O排放通量的昼夜变化规律,基于土壤N2O排放通量观测的日动态数据,确定最佳的日采样时段,为精确评估区域土壤N2O排放通量提供基础数据。采用静态箱-气相色谱(GC)法,对大青山油松人工林2020—2021年生长季和冻融期土壤的N2O排放通量进行野外原位观测。结果表明:1)生长季(2020年6—9月),观测日土壤N2O排放通量平均值都出现在当日的15:00—17:00时段内;冻融期(2020年11月至翌年3月),观测日8:00—12:00时段的观测值接近土壤N2O排放通量的日平均值。2)2021年,观测日土壤N2O排放通量平均值出现在7月当日的7:00—9:00时段内及6—9月当日的15:00—17:00时段内。根据研究结果确定了大青山地区油松人工林土壤N2O排放通量的最佳取样时间为生长季的上午9:00或下午15:00,冻融期的上午8:00,获得的通量值经过矫正后可代表当日土壤N2O平均排放通量;根据生长季和冻融期温度与土壤N2O排放通量效应值的分析结果,确定温度为影响大青山地区油松人工林土壤N2O排放通量的重要因素。
李枭阳 , 马秀枝 , 杨玉培 , 李长生 . 油松人工林土壤N2O排放通量的昼夜变化规律及其影响因子[J]. 林草资源研究, 2023 , 0(2) : 88 -95 . DOI: 10.13466/j.cnki.lyzygl.2023.02.012
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.
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