Stable isotope fractionation provides information on carbon dynamics in soil aggregates subjected to different long-term fertilization practices

文献类型： 外文期刊

第一作者： Liu, Yi

作者： Liu, Yi;Wang, Li;Li, Zhiguo;Pan, Junfeng;Chen, Fang;Liu, Yi;Hu, Cheng;Hu, Wei

作者机构：

关键词： Soil aggregate;Stable isotope natural abundance;Long-term fertilization

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：5.374； 五年影响因子：6.368 ）

ISSN： 0167-1987

年卷期： 2018 年 177 卷

页码：

收录情况： SCI

摘要： Stable carbon (C) isotopes provide valuable information to study C incorporation in soil aggregates. Different soil aggregate fractions have different concentrations of soil organic C (SOC), and changes in the abundance of soil C isotopes are closely linked to aggregate turnover. Soils from rice-wheat rotation fields in a long-term (31 years) experiment established in subtropical Central China were analyzed to improve knowledge of the influence of long-term fertilization (e.g. inorganic fertilizers) on the organic C isotope composition of different aggregate fractions. Aggregate-associated C levels and delta C-13 values (C-13 to C-12 ratios, relative to a standard) ranged from 19.0 to 23.1 g kg(-1), and from -24.8 to -23.00%, respectively, across all treatments. However, SOC concentrations and delta C-13 values were higher under treatments including inorganic fertilization than under the control (fertilizer-free, CK) treatment. In addition, delta C-13 values of micro-aggregates (< 0.25 mm) were higher than those of macro-aggregates (> 0.25 nun), i.e. the micro-aggregates (< 0.25 mm) exhibited C-13 enrichment. Analyses of C flows between aggregates of different size classes (modelled in a scheme) indicate that C generally flows from macro-aggregates to micro-aggregates (or remains with them as they become successively smaller), and treatments with mineral fertilizers retarded these flows, relative to rates under the CK treatment. The results show that analyses of the natural abundance of stable C isotopes can provide valuable information on biogeochemical processes related to C transformation in soil aggregates.

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