The roles of surface soil carbon and nitrogen in regulating the surface soil pH and redox potential of sulfidic soil materials of acid sulfate soils

Michael P. S., . The roles of surface soil carbon and nitrogen in regulating the surface soil pH and redox potential of sulfidic soil materials of acid sulfate soils. pp. 1627-1642. ISSN 1511-3701

Acid sulfate soils (ASS) have been described as the nastiest� soils on earth because of their harmful impacts on various soil and environmental systems. ASS pose no problems unless the sulfidic soil materials are disturbed or exposed and the sulfides are oxidized leading to production of sulfuric soil materials and generation of sulfuric acidity. In sulfidic soil unless there is disturbance or exposure in the deep soil only the surface soil seems to be frequently exposed and disturbed leading to oxidation as a result of oxygen penetration. We have reported recently the importance of soil carbon and nitrogen in amelioration of ASS but the roles on the surface soil was not clearly established. In this study the roles of surface soil carbon and nitrogen in regulating the surface soil redox potential (Eh) and pH of sulfidic soil material of ASS was investigated following the addition of different sources of soil carbon and nitrogen. The results showed the mechanisms involved in curtailing of sulfidic soil material oxidation and acidification were dependent on the type of metabolic substrates and the microbial ecology the resources were capable of establishing. Addition of a single nutrient source e.g. glucose capable of engaging a few soil microbes was ineffective in preventing sulfidic soil oxidation whereas addition of complex metabolic substrates e.g. organic matter as a source of multiple resources for microbial metabolism effectively reduced the Eh and highly increased the pH even under aerobic soil conditions.

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Abstract

Acid sulfate soils (ASS) have been described as the nastiest� soils on earth because of their harmful impacts on various soil and environmental systems. ASS pose no problems unless the sulfidic soil materials are disturbed or exposed and the sulfides are oxidized leading to production of sulfuric soil materials and generation of sulfuric acidity. In sulfidic soil unless there is disturbance or exposure in the deep soil only the surface soil seems to be frequently exposed and disturbed leading to oxidation as a result of oxygen penetration. We have reported recently the importance of soil carbon and nitrogen in amelioration of ASS but the roles on the surface soil was not clearly established. In this study the roles of surface soil carbon and nitrogen in regulating the surface soil redox potential (Eh) and pH of sulfidic soil material of ASS was investigated following the addition of different sources of soil carbon and nitrogen. The results showed the mechanisms involved in curtailing of sulfidic soil material oxidation and acidification were dependent on the type of metabolic substrates and the microbial ecology the resources were capable of establishing. Addition of a single nutrient source e.g. glucose capable of engaging a few soil microbes was ineffective in preventing sulfidic soil oxidation whereas addition of complex metabolic substrates e.g. organic matter as a source of multiple resources for microbial metabolism effectively reduced the Eh and highly increased the pH even under aerobic soil conditions.

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Item Type:	Article
AGROVOC Term:	soils
AGROVOC Term:	Acid sulfate soils
AGROVOC Term:	Soil surface properties
AGROVOC Term:	Nitrogen compounds
AGROVOC Term:	Redox potential
AGROVOC Term:	Lucerne
AGROVOC Term:	Soil moisture
AGROVOC Term:	Moisture content
AGROVOC Term:	Soil acidity
AGROVOC Term:	Soil alkalinity
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:29
URI:	http://webagris.upm.edu.my/id/eprint/24751

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