Variability of Nitrogen Mineralization from Organic Matter in Agricultural Soils in the North of Colombia

Martínez-Mera, Eliana; García-Paredes, Diego; Corrales, Amaira; Torregroza-Espinosa, Ana Carolina

doi:10.12982/cmujns.2021.073

Cited by 2 publications

(1 citation statement)

References 30 publications

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“…Indeed, soil microorganisms can transform insoluble organic N into soluble organic N through the action of extracellular enzymes, then into inorganic N forms that plants can absorb and utilize 4 , 5 . Soil N mineralization is the key process transforming organic N into inorganic N, namely ammonium N (NH 4 + -N) and nitrate N (NO 3 – -N), through the ammonification and nitrification processes, which are the major internal ecological processes influencing the availability of soil inorganic N to plants and microorganisms 6 , 7 . Net N mineralization refers to the net accumulation of inorganic N in the soil solution over a specific period 8 .…”

Section: Introductionmentioning

confidence: 99%

Effects of rainfall amount and frequencies on soil net nitrogen mineralization in Gahai wet meadow in the Qinghai-Tibetan Plateau

Xu,

Li,

et al. 2023

Sci Rep

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Global climate change has led to a significant increase in the frequency of extreme rainfall events in the Qinghai-Tibetan Plateau (QTP), thus potentially increasing the annual rainfall amounts and, consequently, affecting the net soil nitrogen (N) mineralization process. However, few studies on the responses of the soil net N mineralization rates to the increases in rainfall amounts and frequencies in alpine wet meadows have been carried out. Therefore, the present study aims to assess the effects of rainfall frequency and amount changes on the N fixation capacity of wet meadow soils by varying the rainfall frequency and amount in the Gahai wet meadow in the northeastern margin of the QTP during the plant-growing season in 2019. The treatment scenarios consisted of ambient rain (CK) and supplementary irrigation at a rate of 25 mm, with different irrigation frequencies, namely weekly (DF1), biweekly (DF2), every three weeks (DF3), and every four weeks (DF4). According to the obtained results, the increased rainfall frequency and amount decreased the soil mineral N stock and increased the aboveground vegetation biomass (AB) amounts and soil water contents in the wet meadows of the QTP. Ammonium (NH4+-N) and nitrate N (NO3–-N) contributed similarly to the mineral N contents. However, the ammonification process played a major role in the soil mineralization process. The effects of increasing rainfall amount and frequency on N mineralization showed seasonal variations. The N mineralization rate showed a single-peaked curve with increasing soil temperature during the rapid vegetation growth phase, reaching the highest value in August. In addition, the N mineralization rates showed significant positive correlations with soil temperatures and NH4+-N contents and a significant negative correlation with AB (P < 0.05). The results of this study demonstrated the key role of low extreme rainfall event frequencies in increasing the net soil N mineralization rates in the vegetation growing season, which is detrimental to soil N accumulation, thereby affecting the effectiveness of soil N contents.

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Section: Introductionmentioning

confidence: 99%

Effects of rainfall amount and frequencies on soil net nitrogen mineralization in Gahai wet meadow in the Qinghai-Tibetan Plateau

Xu,

Li,

et al. 2023

Sci Rep

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Soil microbial communities from fertile islands under semi-arid conditions in La Guajira, Colombian Caribbean

Leal¹,

Franco²,

Vanegas

2022

Preprint

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Fertile islands are key ecological arrangements for slowing desertification processes in arid and semi-arid environments. These islands harbor a great variety of microorganisms that play an important role in their establishment and dynamics. The taxonomic and functional diversity of bacteria on these islands is conditioned by the nurse tree and the characteristics of their environment. However, the microbial diversity associated with these vegetation patterns is not described in the semi-arid environments of northern South America. The present study analyzed the taxonomic and functional diversity of soil microbial communities of fertile islands belonging to three species of nurse trees in the Colombian Caribbean during a wet and a dry season. DNA extraction and massive sequencing were performed from soil surface samples under the nurse plant canopy and bare soil. The SILVA database was used for taxonomic analyses, DIAMOND and the KEGG database for functional analyses, and STAMP for statistical differences. Taxonomic and functional diversity was mainly determined by seasonality and the presence or absence of vegetation. No significant differences were found among nurse plant species. The highest taxonomic abundances were recorded in the dry season under the nurse tree for the phyla Proteobacteria and Actinobacteriota, and the genera Sphingomonas, Azospira, Solirubrobacter, Flavisolibacter, and Geodermatophilus. While the highest functional potential was detected in the wet season. The presence of several biogeochemical cycling modules and unique genera suggest the presence of microniches that could be differentiated by oxygen tension and nutrient availability due to seasonality and the presence or absence of vegetation.

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Variability of Nitrogen Mineralization from Organic Matter in Agricultural Soils in the North of Colombia

Cited by 2 publications

References 30 publications

Effects of rainfall amount and frequencies on soil net nitrogen mineralization in Gahai wet meadow in the Qinghai-Tibetan Plateau

Effects of rainfall amount and frequencies on soil net nitrogen mineralization in Gahai wet meadow in the Qinghai-Tibetan Plateau

Soil microbial communities from fertile islands under semi-arid conditions in La Guajira, Colombian Caribbean

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