Hot-water extractable carbon in soils: a sensitive measurement for determining impacts of fertilisation, grazing and cultivation

Ghani, A.; Dexter, Moira; Perrott, K. W.

doi:10.1016/s0038-0717(03)00186-x

Cited by 932 publications

(610 citation statements)

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“…C:N ratio in four variants over the investigated period and microbial biomass C. Sparkling et al (1998) and Ghani et al (2003) reported strong correlation between microbial biomass C and HWC content in soil. Ghani et al (2003) extracted from soils 3-7 times higher amount of HWC than that extracted as C of microbial biomass. We extracted only 1.5-1.6 times higher amount of HWC from our soil samples.…”

Section: Relationshipsmentioning

confidence: 87%

“…Hot water extractable C (HWC) content in soil samples plication did not increase the content of microbial biomass C compared to control variant. Okano et al (1991) and Ghani et al (2003) even found the negative impact of N fertilizer addition on the microbial biomass in pastoral soils. Seasonal variation of microbial biomass C content in the period of observation was high; the tendency to increase biomass C content was recorded for all variants in the last three years (Figure 4).…”

Section: Microbial Biomass Cmentioning

confidence: 99%

“…It is therefore necessary to use the short-term sensitive characteristics. Soil microbial biomass, and hot water extractable carbon (HWC) were the most sensitive indicators among the soil biochemical measurements considered to reflect the changes in the SOM caused by different soil management practices (Ghani et al 1999(Ghani et al , 2003. Besides the biochemical methods, modern effective analytical techniques exist, and non-destructive FTIR spectroscopy as the sensitive infrared technique is one of them.…”

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confidence: 99%

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The influence of long-term organic and mineral fertilization on soil organic matter

Šimon¹

2008

Soil & Water Res.

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Parameters evaluating soil organic matter quantity (organic C and N content) and quality (hot water extractable C content, aliphatic compounds, microbial biomass C content, basal respiration activity) were determined in soils differently fertilized (NPK -mineral fertilization 64.6 kg N/ha/year, FYM -farmyard manure 38.6 kg N/ha/year, FYM + NPK -103.3 kg N/ha/year) in long-term field experiment established in 1955 in Prague. Variant without any fertilization was used as a control. Nine years crop rotation (45% cereals, 33% root crops, 22% fodder crops) is practiced in this long-term experiment. Soil samples were taken from the arable layer (0-20 cm) in spring over the period of 1994-2004. Continual application of FYM and FYM + NPK increased the organic carbon content, hot water extractable C (HWC) content, aliphatic compounds content and microbial biomass C content significantly compared to control variant. Mineral fertilization (NPK) increased only organic C content significantly compared to control variant; HWC content, aliphatic compounds content and microbial biomass C content were increased not significantly. Basal respiration activity did not differ significantly between the variants but the influence of plants cropped in individual years on the basal respiration was observed. The total N content was increased significantly only in FYM + NPK variant as compared to control variant. Presence of lucerne in crop rotation contributed positively to the total nitrogen content in soil of all variants due to the symbiotic N 2 fixation. C:N ratio varied from 9.96 to 10.46. Significant positive relationships (r = 0.30 to 0.68; P < 0.05) among the all parameters were determined with exception of basal respiration activity. The most of measured characteristics tended to be constant or slightly increase in the period of observation that shows evidence of stability of this soil management system.

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Section: Relationshipsmentioning

confidence: 87%

Section: Microbial Biomass Cmentioning

confidence: 99%

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confidence: 99%

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The influence of long-term organic and mineral fertilization on soil organic matter

Šimon¹

2008

Soil & Water Res.

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“…The easily decomposable fraction of soil organic matter (SOM) is a reactive agent with a relatively high transformation rate (Ghani et al 2003). Its content is proportional to the quantity of microbial biomass in soil (Lovell and Jarvis 1998) and therefore it is an important factor of potential soil fertility.…”

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confidence: 99%

“…Its content is proportional to the quantity of microbial biomass in soil (Lovell and Jarvis 1998) and therefore it is an important factor of potential soil fertility. Many authors consider the higher content of the labile fraction of the soil carbon (SOC) as a feature of soil quality (Ghani et al 2003, Haynes 2005, Maia et al 2007). Unfortunately, it cannot be stated that it is a steady feature of quality.…”

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confidence: 99%

Relationships between quality and quantity of soil labile fraction of the soil carbon in Cambisols after liming during a 5-year period

Kolář¹,

Vaněk²,

Kužel³

et al. 2011

PLANT SOIL ENVIRON

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The labile fraction of soil organic carbon (SOC) in terms of its quantity is a sensitive but dynamic indicator of the reactive agent in soils. If it is to be considered as a feature of soil quality, the value of its quantity should be completed by data on its quality. It can be expressed by the value of the rate constant of microbial oxidation k bio of this fraction or by data on chemical stability during hydrolysis or oxidation. If the quality of SOC labile fraction is not determined, at least the ratio of C MIC : C org should be given. The adjustment of soil acidity increases the microbial activity of soils, therefore the quantity of SOC labile fraction decreases and at the same time k bio decreases proportionately to the increasing stability of soil organic matters. During a 5-year period after the liming the soils acidify again and this process passes the faster the lesser their ion exchange capacity and buffering are. The quantity of the labile fraction of SOC raises again, its stability decreases and k bio raises again. The conversion pH value has secondary relevance.

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Carbon Sequestration Potential of Restored Coal Mine Soils

2023

Eco‐Restoration of Mine Land

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Hot-water extractable carbon in soils: a sensitive measurement for determining impacts of fertilisation, grazing and cultivation

Cited by 932 publications

References 29 publications

The influence of long-term organic and mineral fertilization on soil organic matter

The influence of long-term organic and mineral fertilization on soil organic matter

Relationships between quality and quantity of soil labile fraction of the soil carbon in Cambisols after liming during a 5-year period

Carbon Sequestration Potential of Restored Coal Mine Soils

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