全球尺度上土壤15N自然丰度空间变化的影响因素
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S153

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国家自然科学基金项目(41901030)和江苏省自然科学基金项目(BK20191096)资助。


Study on Factors Influencing Spatial Variation of Soil 15N Natural Abundance on Global Scale
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    摘要:

    目前土壤15N自然丰度(δ15N)空间变化影响机制的研究多聚焦于区域尺度,对全球尺度的探索存在不足。本文采用全球812个样点处的土壤δ15N值与土壤含水量、气象、土壤性质因子数据,构建各因子与土壤δ15N值的相关关系,并结合结构方程模型以揭示全球尺度土壤δ15N值空间变化的影响机制。结果表明:土壤含水量、气象、土壤性质因子与土壤δ15N值呈显著相关关系(P<0.01);相较于均值,气象的时间变化特征因子(平均气温日较差和降雨季节变率)与土壤δ15N值和土壤含水量的相关程度更高。土壤性质因子对土壤δ15N值的总效应最高(–0.41);气象和土壤性质因子可通过土壤含水量间接影响土壤δ15N值。当排除气象和土壤性质的影响后,土壤含水量对土壤δ15N值的效应为正。

    Abstract:

    Most of the current studies on the spatial variation of soil 15N natural abundance (δ15N) and its influencing factors focus on the regional scale, there is a lack of exploration on global scale. In this paper, soil δ15N values and the data of factors of soil water content, meteorology and soil property at 812 sample sites were used to construct correlations between different factors and soil δ15N, and to reveal influence mechanisms of its spatial variation by structural equation modeling. The results show that soil water content and meteorological and soil property factors are significantly correlated with soil δ15N (P<0.01); soil δ15N and soil water content are more correlated with the meteorological time-varying characteristic factors (mean diurnal range of temperature and precipitation seasonality) than with the mean values. The total effect of soil property factors on soil δ15N is the highest (-0.41); meteorological and soil property factors indirectly affect soil δ15N by acting on soil water content. The effect of soil water content on soil δ15N is positive after excluding the effects of meteorology and soil property.

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昝麒麟,赖晓明,朱青,王卫光,李柳阳,刘亚.全球尺度上土壤15N自然丰度空间变化的影响因素[J].土壤,2022,54(5):920-927. ZAN Qilin, LAI Xiaoming, ZHU Qing, WANG Weiguang, LI Liuyang, LIU Ya. Study on Factors Influencing Spatial Variation of Soil 15N Natural Abundance on Global Scale[J]. Soils,2022,54(5):920-927

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  • 收稿日期:2021-12-24
  • 最后修改日期:2022-02-23
  • 录用日期:2022-03-09
  • 在线发布日期: 2022-10-31
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