Microbial N immobilization is of great importance in acidified mountain spruce forest soils

Tahovská, Karolina; Kaňa, Jiří; Bárta, Jiří; Oulehle, Filip; Richter, Andreas; Šantrůčková, Hana

doi:10.1016/j.soilbio.2012.12.015

Cited by 75 publications

(45 citation statements)

References 110 publications

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“…Hence, we suggest that in subtropical soils, the variability of the N immobilization rates might be more affected by the forest type via plant C inputs and C turnover than the present N status. This view was supported by the study of Tahovská et al (2013), which showed that the pattern of N transformations in C limited soil was different from the other soils and proposed that microbial N immobilization should be considered together with soil C availability when evaluating the N saturation status of the ecosystem.…”

Section: Immobilization Of N and The Impacts Of Tree Species Under Thmentioning

confidence: 91%

Net and gross N transformation rates in subtropical forest soils under aerobic and anaerobic conditions

Zhao

Cai

2014

J Soils Sediments

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Purpose This study investigated the differences between net and gross rates of N transformation in subtropical forest soils under aerobic and anaerobic conditions. We aim to explore the factors responsible for the differences observed and to evaluate the ability of net and gross N transformation measurements to reflect the occurrence and stimulation of N transformation in subtropical forest soils. Materials and methods Subtropical soil samples from adjacent native forest (NF) and two plantation forest sites (Pinus caribaea var. hondurensis (PCH) and Hoop pine (HP), Araucaria cunninghammii), with different initial pool sizes of NH 4 + and NO 3 − , were collected from South East Queensland, Australia. Soil samples were incubated at 25°C to determine net and gross N transformation rates ( 15 N pool dilution method) under aerobic and anaerobic conditions. Results and discussion Under aerobic and anaerobic conditions, gross N transformation rates differed significantly from net N transformation rates. NH 4 + immobilization occurred under aerobic and anaerobic conditions for all soils. NO 3 − immobilization occurred under aerobic conditions in the NF soils but was negligible in both the PCH and HP soils. Gross ammonification rates were significantly correlated with the C/N ratios (R 2 =0.714, p<0.001). Gross nitrification rates were significantly correlated with soil carbon composition ( 13 C, R 2 =0.569, p<0.01). The ratios of the gross rates of NH 4 + immobilization to the gross ammonification rates (R_i a /g a ) were significantly correlated with δ 13 C (R 2 =0.829, p<0.001). The results indicated that in the subtropical forest soils, both the variability of gross N production and immobilization mainly influenced the net N transformation rates. Forest type affected the gross production or immobilization of NH 4 + and NO 3 − via C turnover, which was indicated by the relationship between the N transformation rates and soil C/N ratio or soil 13 C.Conclusions Although subtropical forest soils are generally an N-unlimited system, the immobilization of NH 4 + and NO 3 − under aerobic or anaerobic conditions played an important role in the N transformations. Net rates of NH 4 + /NO 3 − accumulation are not suitable to describe the occurrence and stimulation of N transformations in subtropical soils when immobilization (or other consumption processes) of NH 4 + and NO 3 − is occurring, especially under anaerobic conditions.

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Section: Immobilization Of N and The Impacts Of Tree Species Under Thmentioning

confidence: 91%

Net and gross N transformation rates in subtropical forest soils under aerobic and anaerobic conditions

Zhao

Cai

2014

J Soils Sediments

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“…In the Mediterranean areas, decomposition is often hampered by climatic conditions and a larger fraction of dead plant material accumulates (Jobbágy and Jackson, 2000), forming a humus layer with low but constant nutrient release. There, high SOM contents have enabled the evolution of stronger consumer-resource interactions between plants and nutrient pools, which are facilitated by plant-fungus-soil interactions (Tahovská et al, 2013). Tree species have been shown to create soil conditions that enhance decomposition of their own litter (Ayres et al, 2009a,b;Vivanco and Austin, Figure 2.14 Grime's Competitors-Stress tolerators-Ruderals triangle for arbuscular mycorrhizal (AM) fungi according to their resistance to stress and disturbance factors as well as their phenotypic traits.…”

Section: Stoichiometry and Mutualism In An Exploited Worldmentioning

confidence: 99%

Connecting the Green and Brown Worlds

Mulder

Ahrestani

Bahn

et al. 2013

Ecological Networks in an Agricultural World

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“…Therefore, the reduction in the

{NO}_{3}^{-}

pool could have been largely caused by

{NO}_{3}^{-}

immobilization ( Schimel et al., ). Although

{NH}_{4}^{+}

is generally regarded as the preferred N source for soil microorganisms ( Burger and Jackson , ), it has been found that bacteria are capable of synthesizing numerous proteins based on the uptake of

{NO}_{3}^{-}

( González et al., ) and that microbial immobilization of

{NO}_{3}^{-}

is very common in some ecosystems ( Booth et al., ; Tahovská et al., ).…”

Section: Discussionmentioning

confidence: 99%

Net nitrogen mineralization and enzyme activities in an alpine meadow soil amended with litter tannins

Zong

Wang

Qiu

et al. 2018

J. Plant Nutr. Soil Sci.

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Condensed tannins in plant litter play an important role in soil nitrogen (N) cycling at the plant–soil interface. However, how soil net N mineralization is affected by litter tannins through their interactions with soil enzymes remains unclear. The aims of our study are to explore the effects of litter tannins with different structures on soil net N mineralization and on the activities of soil enzymes that are directly or indirectly related to N mineralization. Soils were collected from a Tibetan alpine meadow community dominated by a tannin‐rich forb species, Polygonum viviparum. Condensed tannins purified from the litter were separated into the light‐fraction and heavy‐fraction tannins, with the former having a lower mean degree of polymerization and a higher prodelphinidin:procyanidin (PD:PC) monomer ratio in the structure than the latter. Soils were amended with the light‐fraction, heavy‐fraction, and unfractionated tannins, and then incubated for four weeks. The dynamics of soil enzyme activities and soil net N mineralization were monitored during the incubation. The results show that among the enzyme activities tested, the activities of laccase and peroxidase were significantly inhibited by the three tannins, whereas the activity of polyphenol oxidase was only significantly suppressed by the heavy‐fraction tannins. The overall activity of urease was not significantly affected by the tannin additions. In contrast, the activity of N‐acetyl‐β‐D‐glucosaminidase was significantly enhanced by the three tannins. These results suggest that the interactions between litter tannins and soil enzymes rely on both the structure of the tannins and the type of enzymes. Soil net N mineralization was significantly decreased by the three tannins, which could be attributed to the decreased net ammonification and increased immobilization of inorganic N. The light‐fraction tannins caused a more pronounced inhibitory effect on soil net N mineralization than the heavy‐fraction and unfractionated tannins, probably due to the stronger interaction of the PD monomers with soil enzymes and soil organic N compounds than the PC monomers. Overall, this study indicates that litter tannins with different structures could exert different effects on the activities of soil enzymes as well as on soil net N mineralization, which is important for interpreting the role of different litter tannins in N cycling at the plant–soil interface.

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Microbial N immobilization is of great importance in acidified mountain spruce forest soils

Cited by 75 publications

References 110 publications

Net and gross N transformation rates in subtropical forest soils under aerobic and anaerobic conditions

Net and gross N transformation rates in subtropical forest soils under aerobic and anaerobic conditions

Connecting the Green and Brown Worlds

Net nitrogen mineralization and enzyme activities in an alpine meadow soil amended with litter tannins

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