Nutrient dynamics in an Andean forest region: a case study of exotic and native species plantations in southern Ecuador

Quichimbo, Pablo; Jiménez, Leticia Adelaida Jiménez; Veintimilla, Darío; Potthast, Karin; Tischer, Alexander; Günter, Sven; Mosandl, R.; Hamer, Ute

doi:10.1007/s11056-019-09734-9

Cited by 8 publications

(2 citation statements)

References 68 publications

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“…There was no difference in the C and N turnover times of the ecosystem between forest types. This result is inconsistent with those of previous studies, wherein forest types affected the C and N turnover times (Quichimbo et al., 2020; Wang et al., 2018; Zhang et al., 2010; Zhou et al., 2010). These studies found that the C and N turnover times changed with forest type because forest types determine leaf lifespan (Reich et al., 1992), C use efficiency (Kwon & Larsen, 2013), and decomposition rate (Noh et al., 2017).…”

Section: Discussioncontrasting

confidence: 99%

Carbon and Nitrogen Turnover Times of South Korean Forests Estimated via Data‐Model Fusion

et al. 2021

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Carbon (C) and nitrogen (N) are fundamental elements that support forest life. The assessment of C and N stocks has been a core focus since the inception of biogeochemistry in terms of the implications of C sequestration and N losses (Högberg et al., 2017;Howarth et al., 2006;Pan et al., 2011). At the ecosystem level, C and N stocks are the balance between (a) input fluxes to forests including photosynthesis, N deposition, and biological N fixation, (b) internal fluxes in forests such as litterfall, N mineralization, and N retranslocation, and (c) output fluxes from forests through respiration, N leaching, and denitrification (Agren & Andersson, 2012;Gundersen, 1991). This balance can be interpreted by turnover time, which represents the average time elapsed between the input of an element to forests and its output from forests in an autonomous Abstract Biogeochemical models use estimates of carbon (C) and nitrogen (N) turnover times for the future projection of global forest C and N stocks, but unexplained variation in the C and N turnover times is causing considerable uncertainty. This study aimed to estimate C and N turnover times of South Korean forests and explain their variation with forest type, temperature, precipitation, stand age, and ecosystem C:N ratio. We used the balance method and data-model fusion to estimate the C and N turnover times. Data-model fusion was used to integrate the National Forest Inventory data (2011-2020) with a biogeochemical model, Forest Biomass and Dead organic matter Carbon and Nitrogen (FBD-CAN). The N turnover time (376-499 years) was ∼45 times longer than the C turnover time (9-10 years). Forest type had no substantial effects on the C and N turnover times. However, the C and N turnover times were positively correlated with stand age and ecosystem C:N ratio, and negatively correlated with temperature. Overall, ecosystem C:N ratio, stand age, temperature, and precipitation explained 45%, 15%, 12%, and 3%, respectively, of the total variation of the C and N turnover times. These results contribute to the understanding and prediction of forest C and N changes in a changing world and highlight the importance of considering C:N ratio for reliable estimation of the C and N turnover times.Plain Language Summary Forests are major sinks of carbon and nitrogen that can cause global warming when present in gaseous forms. Turnover times, referring to the time an element remains in an ecosystem, are measures of the long-term stability of carbon and nitrogen. Models use estimates of turnover times for future projections of carbon and nitrogen cycles, but limited knowledge in turnover times and model uncertainty are causing trouble. Data-model fusion is a technic that combines data and model's output to decrease model uncertainty. We used data-model fusion to estimate carbon and nitrogen turnover times with a model and field-measured carbon and nitrogen data in the South Korean forests. We then explained how forest type, temperature, precipitation, forest age, and carbon:nitrogen ratio a...

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Section: Discussioncontrasting

confidence: 99%

Carbon and Nitrogen Turnover Times of South Korean Forests Estimated via Data‐Model Fusion

et al. 2021

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“…In the Andean mountains of Ecuador, there are significant pine forest plantations, without them being native vegetation of the area. When the soils of these mountains are abandoned after having been used for cultivation and overgrazing, they are reforested with exotic species in a poorly executed attempt, without technical or scientific criteria, to remedy the damage caused by the loss of native vegetation [23][24][25]. This has led to the existence of specific "patches" of exotic vegetation, such as pine, within areas of ecological interest in the Andean mountains; for this reason, according to the study area, our research proposes comparing the microbiota (bacteria) of this exotic vegetation with that which exists in the native vegetation to identify the potential that these soils may have to harbor bacteria that can later be used for environmental remediation applications.…”

Section: Introductionmentioning

confidence: 99%

Nitrite-Oxidizing Bacterial Strains Isolated from Soils of Andean Ecosystems and Their Potential Use in Nitrogen Reduction

et al. 2023

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Nitrification is part of the nitrogen cycle that occurs naturally in ecosystems. It is related to the presence of microorganisms and their metabolism, especially bacteria, which are involved in oxidizing compounds such as NH4+ and NO2− to NO3−. In this study, we evaluated the nitrification potential in 12 bacteria strains that belong to the genera Aeromonas, Bacillus, Buttiauxella, Mycobacterium, Paenibacillus, Serratia, and Yersenia, which are part of the cultivable microbial community from soil in a native forest and pine forest in The Labrado area within the Machangara micro-watershed in the Andes located in the south of Ecuador. This investigation aims to identify heterotrophic and lithoautotrophic strains using specific culture media for ammonium oxidative (AOL-AOH) and nitrate oxidation bacteria (ONL-ONH). The formation of nitrifying halos in the culture media allowed the identification of 10 strains with nitrifying potential. Five strains were from the pine forest, four were isolated from the native forest, and one strain was shared between both forests. The Serratia and Yersinia genera have a high NO2− oxidation capacity. Their inoculation in synthetic water rich in nitrogenous products allowed us to determine 40% and 94% nitrite reduction percentages and cell retention times of 20 to 40 days. Our results are promising for their possible potential use in environmental bioremediation processes through inoculation in wastewater for the biological removal of nitrogenous compounds.

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Intercropping with cash crops promotes sustainability of rubber agroforestry: Insights from litterfall production and associated carbon and nutrient fluxes

Yuan,

Yang,

Liu

et al. 2024

European Journal of Agronomy

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Nutrient dynamics in an Andean forest region: a case study of exotic and native species plantations in southern Ecuador

Cited by 8 publications

References 68 publications

Carbon and Nitrogen Turnover Times of South Korean Forests Estimated via Data‐Model Fusion

Carbon and Nitrogen Turnover Times of South Korean Forests Estimated via Data‐Model Fusion

Nitrite-Oxidizing Bacterial Strains Isolated from Soils of Andean Ecosystems and Their Potential Use in Nitrogen Reduction

Intercropping with cash crops promotes sustainability of rubber agroforestry: Insights from litterfall production and associated carbon and nutrient fluxes

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