Seasonal responses in microbial biomass carbon, phosphorus and sulphur in soils under pasture

Zl, He; Wu, Jian; O'Donnell, Anthony G.; Syers, JK

doi:10.1007/s003740050267

Cited by 153 publications

(88 citation statements)

References 27 publications

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“…The obtained microbial biomass values were consistent with other studies in many regions of the world that focused on a variety of factors, including soils, climates, and experimental conditions. Under temperate conditions, the microbial biomass ranged from 55 to 1627 µg g -1 for C and from 20 to 248 µg g -1 for N (Smith and Paul, 1990;Brookes et al 1984) and from 5 to 300 µg g -1 for P (Brookes et al 1984;He et al 1997). However, under Brazilian tropical/subtropical conditions, the microbial biomass presented a narrower range.…”

Section: Microbial Biomassmentioning

confidence: 99%

“…These differences in the microbial biomass ratios suggest that the composition of the soil microbial community, and the rate of immobilization and mineralization of soil nutrients may be affected by different green manures. The microbial biomass ratio (C:N and C:P) can be used to indicate the likely impact of the microbial biomass on the availability of N and P in soil (He et al, 1997). Narrow C:N and C:P ratios show that the biomass is enriched in N and P, which has a high potential to release these nutrients by mineralization.…”

Section: Microbial Biomass Ratiomentioning

confidence: 99%

“…In the inter row space, a higher microbial C:P ratio was also observed with L. leucocephala cultivation. The range of microbial biomass C:P ratios is quite wide from 5.0 to 276 (Joergensen et al 1995;He et al, 1997) in different climates, soil management systems and analytical procedures. However, under Brazilian tropical/subtropical conditions, the microbial biomass C:P ratio has been shown to vary from 14 to 45 (Balota et al 2003;Duda et al,.…”

Section: Microbial Biomass Ratiomentioning

confidence: 99%

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Microbial activity in soil cultivated with different summer legumes in coffee crop

Balota

Chaves

2011

Braz. arch. biol. technol.

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Section: Microbial Biomassmentioning

confidence: 99%

Section: Microbial Biomass Ratiomentioning

confidence: 99%

Section: Microbial Biomass Ratiomentioning

confidence: 99%

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Microbial activity in soil cultivated with different summer legumes in coffee crop

Balota

Chaves

2011

Braz. arch. biol. technol.

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“…The release in soil of phosphatase enzymes and organic anions, the heterotrophic activity (Trolove et al 2003) and the size of the soil microbial biomass (He et al 1997) are factors influencing the availability of soil P to plants. AMF influence all these factors, in addition to physically enhancing plant P extraction capabilities (Smith and Read 1997).…”

Section: Arbuscular Mycorrhizae Nh 4 + and P Transformation In Soilmentioning

confidence: 99%

“…available P. Therefore, it serves as a reservoir preventing P from becoming fixed by soil minerals. In a meadow hay trial, in the United Kingdom, the size of this reservoir was estimated at 17-290 kg P ha -1 , depending on the fertilization treatment, in the top 0-to 15-cm soil layer (He et al 1997). This biomass corresponds to approximately 11-190 kg P ha -1 cycling per year through the system, as compared to herbage yield exportations of 2-11 kg P ha -1 per year.…”

Section: Arbuscular Mycorrhizae Nh 4 + and P Transformation In Soilmentioning

confidence: 99%

Impact of arbuscular mycorrhizal fungi on N and P cycling in the root zone

Hamel¹

2004

Can. J. Soil. Sci.

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Hamel, C. 2004. Impact of arbuscular mycorrhizal fungi on N and P cycling in the root zone. Can. J. Soil Sci. 84: 383-395. The influence of arbuscular mycorrhizal fungi (AMF) on soil processes is difficult to define, in part because it varies with the plant and fungal genotypes as well as with environmental conditions. The influence of AMF on N cycling is just being discovered. This short review examines areas of knowledge related to the nature of the mycorrhizosphere, AMF-microbe interactions, and N and P mobilization in the root zone. The role AMF could play in the root zone in N and P dynamics is presented. The spatial organization of roots and hyphae in soil suggests that AMF may enhance the reabsorption of nutrients lost through root exudation. These fungi influence soil microorganisms and, hence, they may influence biochemical reactions in soil including mineralization of organic matter and nitrification. AMF seem to improve the capacity of their host plant to use organic sources of P and N. AMF might improve the ability of plants to compete with saprotrophs for the uptake of P and N. The impact from this latter effect of AMF could exceed that stemming from their possible direct use of amino-acid-N, their production of phosphatase enzymes and possibly of organic anions. Better competitive ability of mycorrhizal plants under conditions of low soil P and N levels could reduce saprotrophic populations and, if this occurs, regulate soil organic matter turnover rate. The management of biological soil resources, in truly sustainable cropping systems, may be the largest challenge in crop production. Il est difficile d'établir avec précision l'incidence des mycorhizes à arbuscules (MA) sur les processus du sol, parce qu'elle varie, d'une part, avec la plante et le génotype des champignons, mais aussi avec les conditions environnementales. On commence à peine à décou-vrir l'influence des MA sur le cycle de l'azote. Ce court article fait le point sur ce qu'on sait de la nature de la myco-rhizosphère, des interactions entre les MA et les microorganismes et de la mobilisation du N et du P dans la rhizosphère. Suit une description du rôle que les MA pourraient jouer dans la dynamique du N et du P au niveau de la rhizosphère. L'organisation spatiale des racines et des hyphes dans le sol laisse croire que les MA pourraient faciliter la réabsorption des éléments nutritifs que les racines perdent par exsudation. Les champignons influent sur la microflore tellurique, donc pourraient modifier les réactions biochimiques dans le sol, y compris la minéral-isation et la nitrification de la matière organique. Les MA semblent accroître la capacité de la plante hôte à exploiter les sources de P et de N organiques. Ils pourraient aussi amener les plantes à mieux concurrencer les saprophytes pour l'absorption du P et du N. Cette dernière propriété pourrait avoir une plus grande incidence que celle issue de l'utilisation directe éventuelle du N des acides aminés, de la synthèse de phosphatase et peut-être de la libération d'anions or...

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Phosphorus pools in soil after land conversion from silvopasture to arable and grassland use

Śla̧zak

Freese

Matos

et al. 2013

Z. Pflanzenernähr. Bodenk.

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Differences in soil P among silvopasture, grassland, and arable lands have been well established. Nevertheless, most of the reports compare soil properties under long‐term sites. Thus, there exists little information on the effect of the conversion of silvopasture to arable or grassland use on soil P pools. The objective of the study was to determine the impact of converting silvopasture system (SP) into arable cropping and grassland system on the distribution of P pools and potential P bioavailability. We compared the following systems: SP system, SP converted to arable cropland (SP‐AL), SP converted to grassland (SP‐GL), and for comparative purposes, a long‐term arable cropland (AL). The P fractionation was performed by a sequential extraction scheme, using acid and alkaline extractants on samples collected from the 0–10 and 10–20 cm soil layers. It was assumed that the large variations in soil‐P fractionations are caused by the different management practices associated with land conversion. The results of P fractionation showed a dominance of calcium‐bound P, HCl‐extractable Pi constituted up to 36% of the soil total P (TP). However, the type of land use did not affect this P fraction. On the other hand, the reduction in labile‐Pi and NaOH‐Pi fractions observed at the SP‐AL site may have led to the decline in readily available P. The soil total organic P (TPo) content was 8% and 17% lower at SP‐AL compared to SP and SP‐GL site, respectively. Labile organic‐P (labile‐Po) content was markedly higher at SP site compared to arable soils, and was ≈ 10% of TPo. The NaOH‐Po constituted the highest fraction of the organic‐P pool (55%–79% of TPo) across all the study systems, and was positively correlated with TPo (p < 0.01). The study indicates that conversion of SP system in temperate regions to arable cropping with conventional tillage seems to result in the reduction of P availability compared to SP, indicating SP as an important land‐use practice.

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Seasonal responses in microbial biomass carbon, phosphorus and sulphur in soils under pasture

Cited by 153 publications

References 27 publications

Microbial activity in soil cultivated with different summer legumes in coffee crop

Microbial activity in soil cultivated with different summer legumes in coffee crop

Impact of arbuscular mycorrhizal fungi on N and P cycling in the root zone

Phosphorus pools in soil after land conversion from silvopasture to arable and grassland use

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