首页|Increased humic materials explain aggregate-protected carbon and nitrogen accumulation in biochar-amended tropical soils

Increased humic materials explain aggregate-protected carbon and nitrogen accumulation in biochar-amended tropical soils

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Increased humic materials explain aggregate-protected carbon and nitrogen accumulation in biochar-amended tropical soils
Humic materials make important contributions to soil organic carbon(C)and nitrogen(N)accumulation.However,information on the correlation between humic substances and the accumulation of soil aggregate-protected C and N in response to biochar application under tropical agroecosystems is limited.Therefore,a field trial was conducted to elucidate the effects of biochar on soil aggregate properties and humic materials and how these humic compounds affect aggregate-protected C and N in a humid tropical agroecosystem.The treatments included no-biochar control(CK),15 Mg biochar ha-1(BC-15),30 Mg biochar ha-1(BC-30),and 30 Mg biochar ha-1+phosphate fertilizer(BC-30+P).The treatments BC-30 and BC-30+P significantly increased the contents of humic materials(humic and fulvic acids)as compared to CK.There was a significant increase in the mean-weight diameter of soil aggregates by 3-and 4-fold in BC-30 and BC-30+P,respectively.Similarly,BC-30 and BC-30+P led to significant increases in soil structural coefficient by 3-and 4-fold,respectively,relative to CK.Significant increases in organic C and N accumulation were observed in the macroaggregates of the biochar-amended soils.Inverse relationships between the degree of polymerization and aggregate-protected C and N were observed,implying that low-molecular-weight aliphatic compounds favor organic C and N accumulation with biochar amendments.The important soil property that contributed to organic C and N accumulation in aggregates was fulvic acid content,which could be used as an early and sensitive indicator to notice early changes in aggregate-protected C and N accumulation in soils of the humid tropics.

degree of humificationfulvic acidhumic acidmacroaggregatessoil structural coefficient

Emmanuel AMOAKWAH、Mohammad A.RAHMAN、Khandakar R.ISLAM、Kwame A.FRIMPONG、Christian A.PHARES、Louis SACKEY、Isaac ASIRIFI、Emmanuel ARTHUR

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Council for Scientific and Industrial Research-Soil Research Institute,Accra Center,Post Office Box M 32,Accra GA-018-2527(Ghana)

Soil,Water and Bioenergy Resources,The Ohio State University South Centers,Piketon OH 45661(USA)

Department of Soil Science,College of Agriculture and Natural Sciences,School of Agriculture,University of Cape Coast,Private Mail Bag,Cape Coast CC-145-8669(Ghana)

Ruhr-Universität Bochum,Geographic Institute,Department of Soil Science and Soil Ecology,Bochum 44780(Germany)

Department of Agroecology,Faculty of Technical Sciences,Arhus University,Blichers Allé 20,Postbox 50,Tjele DK-8830(Denmark)

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degree of humification fulvic acid humic acid macroaggregates soil structural coefficient

2024

10.1016/j.pedsph.2023.07.006

土壤圈(英文版)
中国土壤学会,中科院南京土壤研究所和土壤与农业可持续发展国家重点实验室

土壤圈(英文版)

CSTPCD
影响因子：0.477
ISSN：1002-0160
年,卷(期)：2024.34(6)