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首页> 外文期刊>Soil Science Society of America Journal >Carbon Sequestration in Microaggregates of No-Tillage Soils with Different Clay Mineralogy
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Carbon Sequestration in Microaggregates of No-Tillage Soils with Different Clay Mineralogy

机译：不同黏土矿物学的免耕土壤微团聚体的固碳

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摘要

Identification of diagnostic soil organic matter (SOM) fractions and the mechanisms controlling their formation and turnover is critical for better understanding of C dynamics in soils. Enhanced microaggregate formation and stabilization of C due to reduced macroaggregate turnover has been proposed as a mechanism promoting C sequestration in no-tillage (NT) compared with conventional tillage (CT) systems in temperate soils dominated by 2:1 clay mineralogy. We evaluated the contribution of macroaggregate-protected microaggregates to total soil organic carbon (SOC) sequestration in NT relative to CT in three soils differing in clay mineralogy: a 2:1 clay-dominated soil (2:1), a soil with mixed clay mineralogy [2:1 and 1:1] and oxides (mixed), and a soil dominated by (1:1) clay minerals and oxides (1:1). Microaggregates (mM) were isolated from macroaggregates from 0- to 5- and 5- to 20-cm soil layers. Particulate organic matter (POM) located within the microaggregates (intra-mM-POM) was separated from POM outside of the microaggregates (inter-mM-POM) and the mineral fraction of the microaggregates (mineral-mM). In all three soils, total SOC as well as microaggregate-associated C (mM-C) was greater with NT compared with CT. Although less than half of the total SOC under NT was associated with the microaggregate fraction, more than 90% of the total difference in SOC between NT and CT was explained by the difference in mM-C in all three soils. Thus, we identified and isolated a fraction that explains almost the entire difference in total SOC between NT and CT across soils characterized by drastically different clay mineralogy.
机译：鉴定土壤有机质（SOM）组分 及其控制其形成和周转的机制 对于更好地了解土壤中的碳动力学至关重要。 与常规的相比，有人提出增强的微骨料形成和稳定的C由于 以减少大骨料的周转，是促进免耕（NT）隔离碳的机制 。在以2：1粘土 矿物学为主导的温带土壤中的sup>耕作（CT）系统。我们评估了相对于CT，在三种粘土矿物学不同的土壤中，大骨料保护的 微骨料对NT中总土壤有机碳（SOC）固存 的贡献。 sup> 2：1以粘土为主的土壤（2：1），具有混合粘土矿物学 [2：1和1：1]和氧化物（混合）的土壤，以及以（ 1：1） 粘土矿物和氧化物（1：1）。从0到5厘米和5到5到20厘米土壤层的大骨料中分离出微骨料（mM）。 位于微骨料中的颗粒有机物（POM） > （in-mM-POM）与微骨料 （inter-mM-POM）之外的POM和微骨料 （矿物-mM）。与CT相比，在三种土壤中，NT的总SOC以及与微团聚体相关的 C（mM-C）均大于NT。尽管少于NT的总SOC的一半少于 与 的微骨料部分相关，但NT之间的SOC总差异 的90％以上CT的解释是所有三种土壤中 mM-C的差异。因此，我们确定并分离出一个 馏分，该馏分几乎解释了以不同粘土矿物学为特征的土壤中NT和CT之间总 SOC的几乎全部差异。 。

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  • 来源
    《Soil Science Society of America Journal》 |2004年第6期|1935-1944|共12页
  • 作者

    Karolien Denef; Johan Six; Roel Merckx; Keith Paustian;

  • 作者单位

    Natural Resource Ecology Lab., Colorado State Univ., Fort Collins, CO 80523,Dep. of Soil and Crop Sciences and Natural Resource Ecology Lab., Colorado State Univ., Fort Collins, CO 80523;

    Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616,Dep. of Soil and Crop Sciences and Natural Resource Ecology Lab., Colorado State Univ., Fort Collins, CO 80523;

    Lab. for Soil and Water Management, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium,Dep. of Soil and Crop Sciences and Natural Resource Ecology Lab., Colorado State Univ., Fort Collins, CO 80523;

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