Impacts of land-use change on soil microbial communities and their function in the Amazon Rainforest

Danielson, Rachel E.; Rodrigues, Jorge L. M.

doi:10.1016/bs.agron.2022.04.001

Cited by 9 publications

(4 citation statements)

References 244 publications

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“…The state of Rondônia together with the states of Mato Grosso and Pará collectively accounted for more than 85% of all Amazon deforestation from 1996 to 2005 (INPE, 2011). Due to development of highways that enabled logging and agriculture expansion, significant deforestation in Amazon started in 1970s (Danielson & Rodrigues, 2022; Leite et al., 2011). Deforestation in the state of Rondônia accounted for over 8000 km 2 of forest loss by 1980, which rose to 28,000 km 2 by 1985 (Malingreau & Tucker, 1988).…”

Section: Methodsmentioning

confidence: 99%

Soil phosphorus cycling across a 100‐year deforestation chronosequence in the Amazon rainforest

Xu,

Gu,

Rodrigues

et al. 2023

Global Change Biology

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Deforestation of tropical rainforests is a major land use change that alters terrestrial biogeochemical cycling at local to global scales. Deforestation and subsequent reforestation are likely to impact soil phosphorus (P) cycling, which in P‐limited ecosystems such as the Amazon basin has implications for long‐term productivity. We used a 100‐year replicated observational chronosequence of primary forest conversion to pasture, as well as a 13‐year‐old secondary forest, to test land use change and duration effects on soil P dynamics in the Amazon basin. By combining sequential extraction and P K‐edge X‐ray absorption near edge structure (XANES) spectroscopy with soil phosphatase activity assays, we assessed pools and process rates of P cycling in surface soils (0–10 cm depth). Deforestation caused increases in total P (135–398 mg kg−1), total organic P (Po) (19–168 mg kg−1), and total inorganic P (Pi) (30–113 mg kg−1) fractions in surface soils with pasture age, with concomitant increases in Pi fractions corroborated by sequential fractionation and XANES spectroscopy. Soil non‐labile Po (10–148 mg kg−1) increased disproportionately compared to labile Po (from 4–5 to 7–13 mg kg−1). Soil phosphomonoesterase and phosphodiesterase binding affinity (Km) decreased while the specificity constant (Ka) increased by 83%–159% in 39–100y pastures. Soil P pools and process rates reverted to magnitudes similar to primary forests within 13 years of pasture abandonment. However, the relatively short but representative pre‐abandonment pasture duration of our secondary forest may not have entailed significant deforestation effects on soil P cycling, highlighting the need to consider both pasture duration and reforestation age in evaluations of Amazon land use legacies. Although the space‐for‐time substitution design can entail variation in the initial soil P pools due to atmospheric P deposition, soil properties, and/or primary forest growth, the trend of P pools and process rates with pasture age still provides valuable insights.

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Section: Methodsmentioning

confidence: 99%

Soil phosphorus cycling across a 100‐year deforestation chronosequence in the Amazon rainforest

Xu,

Gu,

Rodrigues

et al. 2023

Global Change Biology

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“…While our comparative approach is robust, the study was conducted in laboratory-controlled conditions with deformed soil samples. Altering soil structure changes aeration and influences CH 4 fluxes [ 97 ], and the field climatic conditions of our study sites vary frequently and dynamically [ 20 ], both affecting the magnitude of soil microbial community activity [ 13 ]. Furthermore, although flooding in upland forests is currently unlikely, extreme climate scenarios are unpredictable [ 21 ].…”

Section: Limitations and Future Researchmentioning

confidence: 99%

Methane-cycling microbial communities from Amazon floodplains and upland forests respond differently to simulated climate change scenarios

Gontijo,

Paula,

Bieluczyk

et al. 2024

Environmental Microbiome

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Seasonal floodplains in the Amazon basin are important sources of methane (CH4), while upland forests are known for their sink capacity. Climate change effects, including shifts in rainfall patterns and rising temperatures, may alter the functionality of soil microbial communities, leading to uncertain changes in CH4 cycling dynamics. To investigate the microbial feedback under climate change scenarios, we performed a microcosm experiment using soils from two floodplains (i.e., Amazonas and Tapajós rivers) and one upland forest. We employed a two-factorial experimental design comprising flooding (with non-flooded control) and temperature (at 27 °C and 30 °C, representing a 3 °C increase) as variables. We assessed prokaryotic community dynamics over 30 days using 16S rRNA gene sequencing and qPCR. These data were integrated with chemical properties, CH4 fluxes, and isotopic values and signatures. In the floodplains, temperature changes did not significantly affect the overall microbial composition and CH4 fluxes. CH4 emissions and uptake in response to flooding and non-flooding conditions, respectively, were observed in the floodplain soils. By contrast, in the upland forest, the higher temperature caused a sink-to-source shift under flooding conditions and reduced CH4 sink capability under dry conditions. The upland soil microbial communities also changed in response to increased temperature, with a higher percentage of specialist microbes observed. Floodplains showed higher total and relative abundances of methanogenic and methanotrophic microbes compared to forest soils. Isotopic data from some flooded samples from the Amazonas river floodplain indicated CH4 oxidation metabolism. This floodplain also showed a high relative abundance of aerobic and anaerobic CH4 oxidizing Bacteria and Archaea. Taken together, our data indicate that CH4 cycle dynamics and microbial communities in Amazonian floodplain and upland forest soils may respond differently to climate change effects. We also highlight the potential role of CH4 oxidation pathways in mitigating CH4 emissions in Amazonian floodplains.

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“…One potential area for future exploration involves assessing the impact of AMF-facilitated ecosystem advantages, such as soil carbon preservation and nutrient circulation, in different LUC scenarios. Changes in land use, such as deforestation or the conversion of native habitats into agricultural and urban areas, can significantly impact AMF communities and their activities [42]. Assessing the influence of these modifications on AMF-mediated advantages to ecosystems can yield valuable understandings of the consequences of modifying land utilization on broader ecosystem processes.…”

Section: Examining the Contribution Of Amf-mediated Ecosystem Service...mentioning

confidence: 99%

Evaluating the impact of land-use change on Arbuscular Mycorrhizal Fungi (AMF) diversity and function

Ephraim Motaroki Menge

2023

Int. J. Sci. Res. Arch.

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The ever-increasing change in land utilization has been acknowledged as a primary factor influencing ecological modifications. These alterations have reignited the interest in understanding the enduring consequences on different soil microorganisms, specifically arbuscular mycorrhizal fungi (AMF). This study investigates the effects of land-use changes (LUCs) on AMF diversity, highlighting the impact of forest degradation, intensified farming approaches, and urban growth on the structure of the AMF community and its mediated services. Research has found that deforestation leads to a decrease in AMF diversity, thereby intensifying the susceptibility of particular species to habitat degradation. The transformation of natural habitats into cultivated landscapes due to agricultural spiraling driven by the need for food production also impacts the diversity of AMF. Urbanization, an expeditiously advancing modification of land usage, has been found to have the potential to cause the fragmentation and degradation of habitats, thus impacting ecosystem benefits of AMF, such as nutrient cycling and water filtration. These changes can have far-reaching consequences for plant communities, nutrient cycling, and ecosystem functioning. Future research should prioritize the development of management strategies, investigating AMF-mediated ecosystem services, and comprehending fundamental mechanisms governing AMF responses to land-use change. This knowledge can guide sustainable land management practices emphasizing AMF diversity and function conservation.

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Impacts of land-use change on soil microbial communities and their function in the Amazon Rainforest

Cited by 9 publications

References 244 publications

Soil phosphorus cycling across a 100‐year deforestation chronosequence in the Amazon rainforest

Soil phosphorus cycling across a 100‐year deforestation chronosequence in the Amazon rainforest

Methane-cycling microbial communities from Amazon floodplains and upland forests respond differently to simulated climate change scenarios

Evaluating the impact of land-use change on Arbuscular Mycorrhizal Fungi (AMF) diversity and function

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