Effects of acidity on mineralization: pH-dependence of organic matter mineralization in weakly acidic soils

Curtin, D.; Campbell, C. A.; Jalil, Abdul

doi:10.1016/s0038-0717(97)00094-1

Cited by 288 publications

(157 citation statements)

References 22 publications

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“…Soil C/N ratio and pH can change the microbial population and activity (Helfrich et al 2008). The short-term microbial responses might also be related to the increased solubility of organic matter with the increase in soil pH (Curtin et al 1998). The increased pH values in the original low pH soil could also enhance the availability of nutrients and consequently increase soil microbial biomass (Atkinson et al 2010;Warnock et al 2010).…”

Section: Discussionmentioning

confidence: 99%

Effects of amendment of different biochars on soil carbon mineralisation and sequestration

Ouyang

Zhang

2014

Soil Res.

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Abstract. The aim of this study was to determine the impact of addition of different biochars on soil carbon mineralisation and sequestration. Different biochars were produced from two types of feedstock, fresh dairy manure and pine tree woodchip, each of which was pyrolysed at 300, 500, and 7008C. Each biochar was mixed at 5% (w/w) with a forest loamy soil and the mixture was incubated at 258C for 180 days, during which soil physicochemical properties and soil carbon mineralisation were measured. Results showed that the biochar addition increased soil carbon mineralisation at the early stage (within the first 15 days) because biochar brought available organic carbon to the soil and changed associated soil properties, such increasing soil pH and microbial activity. The largest increase in soil carbon mineralisation at the beginning of incubation was induced by the dairy manure biochar pyrolysed at 3008C. Soil carbon mineralisation was enhanced more significantly by the dairy manure biochars than by the woodchip biochars, and the enhancement effect decreased with increasing pyrolysis temperature. Although the biochar addition induced increased soil carbon mineralisation at the beginning of the incubation, soil carbon mineralisation rates decreased sharply within a short time (within 15 days) and then remained very low afterwards. Carbon mineralisation kinetic modelling indicated that the stable organic matter in biochars could be sequestrated in soil for a long time and resulted in high levels of carbon sequestration, especially for the woodchip biochars pyrolysed from higher temperatures.

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Section: Discussionmentioning

confidence: 99%

Effects of amendment of different biochars on soil carbon mineralisation and sequestration

Ouyang

Zhang

2014

Soil Res.

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“…Owing to the expanded structure and the net negative charge, the molecule can be fully penetrated by water (Tombácz and Rice 1999), therefore it becomes hydrophilic. As a result, the bonding between organic compounds and soil particles decreases, making organic substances more available for microbial consumption (Curtin et al 1998). …”

Section: Resultsmentioning

confidence: 99%

Effect of liming on microbial biomass carbon of acidic arenosols in pot experiments

Filep¹,

Szili‐Kovács²

2010

PLANT SOIL ENVIRON

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In the paper we investigate the effect of liming on the microbial biomass carbon (MBC) in pot experiments during two vegetation periods. There was also another goal to get better understanding of the role of dissolved organic matter (DOM) and its quality on microbial processes. Pot experiments were carried out on two acidic soils. Liming material treatment was 0, 1, 2, 3 g CaCO 3 /kg soil (corresponding with 0, 1.4, 2.8, 4.1 t CaCO 3 /ha, respectively). On both soils, 3-3 soil samples were taken for two growing periods and the substrate-induced respiration (SIR), dissolved organic carbon and nitrogen (DOC and DON), and soil pH were determined from the soil samples. The SIR can be used to characterize the active biomass within the total microbial biomass. Liming was found to increase soil respiration and consequently MBC in the first year of the experiment, but at the maximum lime rate these values stagnated or declined in many cases on each soil. In the second year, the effects of treatments were much lower both on Kisvárda and on Nyírlugos soils. Under the given experimental conditions, when the DOC/DON ratio rose to above 30-40, disturbances appeared in N supplies to microorganisms. The N content of the easily mineralisable organic matter in the soil became so low that it inhibited the reproduction of the microorganisms.

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“…The depression of mineralisation by soil acidity, and increases in net mineralisation after liming has been observed in a number of studies (Fu et al 1987;Sapek 1997;Curtin et al 1998). There are generally 2 explanations put forward to account for the stimulatory effect of increased pH.…”

Section: Discussionmentioning

confidence: 98%

“…The first is that liming eliminates the H + /Al 3+ toxicity and/or Ca 2+ deficiency that inhibit the microbial biomass in an acidic soil (Adams and Martin 1984). The second explanation is that an increase in pH can increase the availability of substrate for mineralising organisms by increasing the amount of soluble organic material (Curtin et al 1998). …”

Section: Discussionmentioning

confidence: 99%

Subsoil nitrogen mineralisation and its potential to contribute to NH4 accumulation in a Vertosol

Page¹,

Dalal²,

Menzies³

et al. 2003

Soil Res.

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High concentrations of NH 4 + (up to 270 kg N/ha) have been observed in a Vertosol below 1 m depth in south-east Queensland. This study examined the possibility that mineralisation associated with the removal of native vegetation (Acacia harpophylla) for cropping was responsible for the production of NH 4 + . Particularly, the potential contribution of decomposing root material and/or dissolved organic nitrogen (DON) leached into the subsoil after clearing was investigated. The amount of N that was contained within native vegetation root material was determined from an area of native vegetation adjacent to the cleared site containing elevated NH 4 + concentrations. In addition, the amount of NH 4 + that could be mineralised in the native vegetation soil was determined by monitoring NH 4 + concentrations over 360 days in intact cores, and by conducting waterlogged incubations. To determine the rate at which a source of DON leached into the subsoil would mineralise, soil was amended with glutamic acid at a rate of 250 mg N/kg and placed under waterlogged incubation. The possibility that the acidic pH of the subsoil, or the lack of a significant subsoil microbial population, was inhibiting mineralisation was also examined by increasing soil pH from 4.4 to 7.0, and inoculating the subsoil with surface soil microorganisms during waterlogged incubations. Low concentrations of N, approximately 90 kg N/ha between 1.2 and 3 m, were found in the native vegetation root material. In addition, no net N mineralisation was observed in either the extended incubation of intact cores or in the control samples of the waterlogged incubations. Net N mineralisation was also not detected when the subsoil was amended with a source of organic N. Results indicate that this lack of mineralisation is largely due to pH inhibition of the microbial population. It is concluded that the mineralisation of either in situ organic material, or DON transported to the subsoil during leaching events, is unlikely to have significantly contributed to the subsoil NH 4 accumulation at the study site. S R 0 2 0 3 8 M i n e r a l i s a t i o n i n a V e r t o s o l s u b s o i l K . L . P a g e e t a l .

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Effects of acidity on mineralization: pH-dependence of organic matter mineralization in weakly acidic soils

Cited by 288 publications

References 22 publications

Effects of amendment of different biochars on soil carbon mineralisation and sequestration

Effects of amendment of different biochars on soil carbon mineralisation and sequestration

Effect of liming on microbial biomass carbon of acidic arenosols in pot experiments

Subsoil nitrogen mineralisation and its potential to contribute to NH4 accumulation in a Vertosol

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