农业生态管理下的生物源、中间源和物理源有机质团聚体

Pub Date : 2023-03-01 DOI:10.1590/1983-21252023v36n118rc
Celeste Q. Rossi, Luiz A. da S. R. Pinto, Octávio V. T. de Moura, A. Loss, M. G. Pereira
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引用次数: 3

摘要

农业生态管理有利于土壤属性的改善,尤其是土壤有机质和土壤团聚体的改善。该研究的目的是量化来自不同来源的农业生态管理系统的团聚体的腐殖质和可氧化部分的SOM的碳含量。对农业生态综合生产系统的5个试验区进行了评价:AFS -农林复合系统;C-SUN——阳光充足的咖啡;C-SHA—遮荫咖啡;AL-FLE -绿豆杂交种大叶FlemingiaNT -免耕。根据其来源或形成途径,对聚集体进行了分离、鉴定和分类,分为生物成因、中间成因和物理成因。腐植酸组分黄腐酸(C-FAF)、腐植酸(C-HAF)和腐植酸(C-HUMF)的碳含量;和可氧化组分(F1和F2,不稳定;测定SOM的F3和F4(顽固性)。腐殖质组分碳值变化最大的是AFS、C-SUN和C-SHA体系的团聚体。C-HUMF在C-SUN、C-SHA和AL-FLE系统的生物源和中间团聚体中含量最高。SOM可氧化组分的碳含量在不同管理制度下表现出差异,主要表现在C-SUN和C-SHA下团聚体中的F1、F2和F3组分。与C-SHA系统相比,C-SUN系统显示出更高比例的腐殖质和顽固性SOM。C-SHA、C-SUN和AFS农业生态系统的管理实践促进了土壤质量的改善。
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Soil organic matter in biogenic, intermediate and physicogenic aggregates under agroecological management
ABSTRACT Agroecological management can favor the improvement of soil attributes, especially soil organic matter (SOM) and soil aggregation. The objective of the study was to quantify the carbon contents of the humic and oxidizable fractions of SOM of aggregates from different origins from agroecological management systems. Five experimental areas located in the Integrated Agroecological Production System were evaluated: AFS – Agroforestry System; C-SUN – Coffee in full sun; C-SHA – Shaded coffee; AL-FLE – Cultivation in alleys of Flemingia macrophylla with green beans; and NT – No-tillage. The aggregates were separated, identified, and classified as to their origin or formation pathways into biogenic, intermediate, and physicogenic. The carbon contents of the humic fractions fulvic acid (C-FAF), humic acid (C-HAF) and humin (C-HUMF); and oxidizable fractions (F1 and F2, labile; and F3 and F4, recalcitrant) of SOM were determined. The greatest variations in the carbon values of the humic fractions were observed in the aggregates of the AFS, C-SUN and C-SHA systems. In relation to C-HUMF, the highest contents of this fraction were quantified in the biogenic and intermediate aggregates of the C-SUN, C-SHA and AL-FLE systems. The carbon contents of the oxidizable fractions of SOM showed variability between the management systems, mainly for the F1, F2 and F3 fractions in the aggregates under C-SUN and C-SHA. The C-SUN system showed a higher proportion of more humified and recalcitrant fractions of SOM when compared to the C-SHA system. The management practices maids in the agroecological systems of C-SHA, C-SUN and AFS promoted improvements in soil quality.
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