北京山区侧柏生态系统各组分夜间δ13C变化特征和对环境因子的响应
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朱栩辉(1995-),男,甘肃平凉人,硕士研究生,主要从事水土保持研究。E-mail:zxh25800@163.com

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国家自然科学基金项目(41430747,41877152);科技创新服务能力建设-协同创新中心-林果业生态环境功能提升协同创新中心(2011协同创新中心)(市级)(PXM2018_014207_000024)


Variation Characteristics of δ13C of Different Components in Platycladus orientalis Ecosystem During Nighttime and Its Response to Environmental Factors in Beijing Mountainous Area
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    摘要:

    采用同位素光谱测定仪对北京山区侧柏人工林生长旺盛期夜间CO2浓度和δ13C进行原位观测。分析侧柏林生态系统不同组分夜间呼吸δ13C的差异,探究其对环境因子的响应。结果表明:在使用Keeling plot法拟合侧柏林7-9月夜间呼吸作用释放的δ13C时,利用大气稳定度作为筛选条件后,拟合精度从0.43增大到0.82,误差从0.54‰~0.99‰下降到0.50‰~0.82‰。δ13C变化范围为(-28.76±0.51)‰~(-25.18‰±0.59)‰,呈现先增大后减小的趋势;地上侧柏枝条δ13C地上变化范围(-33.16±1.08)‰~(-26.82±0.18)‰,呈增加趋势,在7月底达到最大值,9月变化趋于平稳;地下土壤δ13C地下变化范围(-28.55±0.17)‰~(-21.39±0.37)‰,呈增加趋势,7月底达到最大值,变化波动最大,9月变化趋于平稳,各月δ13C与时间呈二次函数关系;在生长旺盛期夜间土壤呼吸通量占生态系统呼吸通量的54.77%,δ13C地下δ13C地上高2.06‰~7.03‰;逐步回归分析表明,夜间呼吸δ13C受大气湿度影响最显著,大气湿度对各组分碳同位素值变化的贡献率均在60%以上。δ13C地下不受土壤温度的影响,δ13C地上除大气湿度外,大气温度、土壤温湿度对其影响较为均衡。通过对夜间呼吸δ13C的研究,可以更全面地评估北京山区森林生态系统碳平衡,为区域森林生态系统经营提供科学依据。

    Abstract:

    In this study, the isotope spectrometer was used to observe the nighttime CO2 concentration and δ13C during the vigorous growth period of Platycladus orientalis plantation in Beijing mountainous area. The difference of nocturnal respiration δ13C of different components of the P. orientalis ecosystem was analyzed, and its response to environmental factors was explored. The results showed that when using the Keeling plot method to fit the δ13C released by the nocturnal respiration in the P. orientalis plantation from July to September, the fitting accuracy improved from 0.43 to 0.82 and the error decreased from 0.54~0.99 to 0.50~0.82 after the atmospheric stability was used as the screening condition. The variation range of δ13C was (-28.76±0.51) ‰~(-25.18±0.59) ‰, which showed a trend of increasing first and then decreasing. The above-ground variation range of the aboveground arborvitae branch δ13C was (-33.16±1.08) ‰~(-26.82±0.18) ‰, and showed an increasing trend, reaching its maximum at the end of July, and tended to be stable in September. The underground variation of δ13C in the underground soil was (-28.55±0.17) ‰~(-21.39±0.37) ‰, and showed an increasing trend, reaching the maximum in July, as well as the variation was the largest, and the change was stable in September. The relationship between δ13C in each month and time was quadratic function. During the vigorous growth period, the night soil respiration flux accounted for 54.77% of the ecosystem respiratory flux, and the underground δ13C was 2.06‰~7.03‰ higher than the aboveground δ13C. Stepwise regression analysis showed that the nocturnal respiration δ13C was significantly affected by atmospheric humidity. The contribution rate of the atmospheric humidity to the variation of carbon isotope value of each component was more than 60%. The underground δ13C was not affected by the soil temperature. Except for atmospheric humidity, the atmospheric temperature and soil temperature and humidity had relatively balanced effects on the aboveground δ13C. Through the study of night respiration δ13C, it was possible to evaluate more comprehensively the carbon balance of forest ecosystems in Beijing mountainous area, and provide a scientific basis for regional forest ecosystem management.

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朱栩辉, 余新晓, 李瀚之, 贾国栋, 郑鹏飞, 王渝淞, 孙乐乐.北京山区侧柏生态系统各组分夜间δ13C变化特征和对环境因子的响应[J].水土保持学报,2019,33(5):163~170,176

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  • 收稿日期:2019-04-09
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  • 在线发布日期: 2019-10-21
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