Arjun Chakrawal
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View article: ArjunChakrawal/root_opt: root_opt-v1
ArjunChakrawal/root_opt: root_opt-v1 Open
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View article: Simulated In-Stream CO2 Production With Changing Precipitation and Urbanization
Simulated In-Stream CO2 Production With Changing Precipitation and Urbanization Open
View article: Informing litter decomposition models with molecular diversity data
Informing litter decomposition models with molecular diversity data Open
View article: Simulated Soil Respiration is Sensitive to Soil Hydraulic Properties from Intact vs. Repacked Cores
Simulated Soil Respiration is Sensitive to Soil Hydraulic Properties from Intact vs. Repacked Cores Open
Soil hydraulic properties, such as water retention and hydrodynamics, play a pivotal role in regulating belowground carbon (C) storage by influencing microbial activity and nutrient availability. However, empirical measurements of these pr…
View article: Modelling belowground plant acclimation to low soil nitrogen – An eco-evolutionary approach
Modelling belowground plant acclimation to low soil nitrogen – An eco-evolutionary approach Open
Increased root growth to access greater soil mineral nitrogen resources and increased root exudation to stimulate microbial mineralisation of soil organic nitrogen are widely observed plant acclimations to nitrogen limitation. However, the…
View article: Challenges in Integrating Dissolved Organic Matter Chemodiversity into Kinetic Models of Soil Respiration
Challenges in Integrating Dissolved Organic Matter Chemodiversity into Kinetic Models of Soil Respiration Open
The chemodiversity of dissolved organic matter (DOM) in soil has been proposed to influence the microbial metabolism and fate of belowground organic carbon (C). However, effectively integrating DOM chemistry into soil C cycle models to imp…
View article: Emerging multiscale insights on microbial carbon use efficiency in the land carbon cycle
Emerging multiscale insights on microbial carbon use efficiency in the land carbon cycle Open
Microbial carbon use efficiency (CUE) affects the fate and storage of carbon in terrestrial ecosystems, but its global importance remains uncertain. Accurately modeling and predicting CUE on a global scale is challenging due to inconsisten…
View article: Comparing plant litter molecular diversity assessed from proximate analysis and 13C NMR spectroscopy
Comparing plant litter molecular diversity assessed from proximate analysis and 13C NMR spectroscopy Open
View article: Modelling optimal ligninolytic activity during plant litter decomposition
Modelling optimal ligninolytic activity during plant litter decomposition Open
Summary A large fraction of plant litter comprises recalcitrant aromatic compounds (lignin and other phenolics). Quantifying the fate of aromatic compounds is difficult, because oxidative degradation of aromatic carbon (C) is a costly but …
View article: Optimal lignin decomposition during litter decay
Optimal lignin decomposition during litter decay Open
A better understanding of the litter decay process is critical for improved predictions of terrestrial carbon (C) exchange between above and below-ground C reservoirs. Furthermore, developing well-constrained decomposition models with expl…
View article: Decomposition kinetics as an optimal control problem
Decomposition kinetics as an optimal control problem Open
Microbial explicit models are constructed by linking decomposition (the process of organic matter break-down) and substrate uptake to microbial growth, respiration, and mortality. Therefore, the specific choice of the decomposition and/or …
View article: Decomposition rate as an emergent property of optimal microbial foraging
Decomposition rate as an emergent property of optimal microbial foraging Open
Decomposition kinetics are fundamental for quantifying carbon and nutrient cycling in terrestrial and aquatic ecosystems. Several theories have been proposed to construct process-based kinetics laws, but most of these theories do not consi…
View article: Spatial Control of Microbial Pesticide Degradation in Soil: A Model-Based Scenario Analysis
Spatial Control of Microbial Pesticide Degradation in Soil: A Model-Based Scenario Analysis Open
Microbial pesticide degraders are heterogeneously distributed in soil. Their spatial aggregation at the millimeter scale reduces the frequency of degrader-pesticide encounter and can introduce transport limitations to pesticide degradation…
View article: Interacting Bioenergetic and Stoichiometric Controls on Microbial Growth
Interacting Bioenergetic and Stoichiometric Controls on Microbial Growth Open
Microorganisms function as open systems that exchange matter and energy with their surrounding environment. Even though mass (carbon and nutrients) and energy exchanges are tightly linked, there is a lack of integrated approaches that comb…
View article: The role of root physiological and structural plasticity for carbon allocation in plant-soil systems
The role of root physiological and structural plasticity for carbon allocation in plant-soil systems Open
<p>Plant roots are essential for acquiring water and nutrients from soils and constitute a major input source for soil organic matter. Plants invest a significant proportion of the photosynthetically fixed carbon into the growth and …
View article: Energetic scaling in microbial growth
Energetic scaling in microbial growth Open
Significance Understanding the principles underlying microbial growth is paramount to the cycle of carbon and nutrients in the biosphere, bioremediation technologies, and biochemical engineering, as well as to natural selection and evoluti…
View article: Carbon supply–consumption balance in plant roots: effects of carbon use efficiency and root anatomical plasticity
Carbon supply–consumption balance in plant roots: effects of carbon use efficiency and root anatomical plasticity Open
See also the Commentary on this article by Valverde‐Barrantes, 233 : 1539–1541.
View article: Modeling Microbial Adaptations to Nutrient Limitation During Litter Decomposition
Modeling Microbial Adaptations to Nutrient Limitation During Litter Decomposition Open
Microbial decomposers face large stoichiometric imbalances when feeding on nutrient-poor plant residues. To meet the challenges of nutrient limitation, microorganisms might: (i) allocate less carbon (C) to growth vs. respiration or excreti…
View article: Can we use heat flows to quantify microbial traits in soils?
Can we use heat flows to quantify microbial traits in soils? Open
<p>Knowledge of functional traits such as the maximum substrate uptake rate and growth efficiency of microorganisms is crucial in understanding the turnover and storage of soil organic carbon. In addition to CO2 measurements, heat di…
View article: Leveraging energy flows to quantify microbial traits in soils
Leveraging energy flows to quantify microbial traits in soils Open
Heat dissipation from organic matter decomposition is a well-recognized proxy for microbial activity in soils, but only a few modeling studies have used heat signals to quantify microbial traits such as maximum substrate uptake rate, speci…
View article: Substrate spatial heterogeneity reduces soil microbial activity
Substrate spatial heterogeneity reduces soil microbial activity Open
View article: Rainfall intensification increases the contribution of rewetting pulses to soil heterotrophic respiration
Rainfall intensification increases the contribution of rewetting pulses to soil heterotrophic respiration Open
Soil drying and wetting cycles promote carbon (C) release through large heterotrophic respiration pulses at rewetting, known as the “Birch” effect. Empirical evidence shows that drier conditions before rewetting and larger changes in soil …
View article: Quantifying microbial metabolism in soils using calorespirometry — A bioenergetics perspective
Quantifying microbial metabolism in soils using calorespirometry — A bioenergetics perspective Open
Microbial carbon use efficiency (CUE) measures the partitioning between anabolic and catabolic processes. While most work on CUE has been based on carbon (C) mass flows, the roles of organic C energy contents and microbial energy demand on…
View article: Rainfall intensification increases the contribution of rewetting pulses to soil respiration
Rainfall intensification increases the contribution of rewetting pulses to soil respiration Open
Soil drying and wetting cycles promote carbon (C) release through large heterotrophic respiration pulses at rewetting, known as Birch effect. Empirical evidence shows that drier conditions before rewetting and larger changes in soil moistu…
View article: Dynamic upscaling of decomposition kinetics for carbon cycling models
Dynamic upscaling of decomposition kinetics for carbon cycling models Open
The distribution of organic substrates and microorganisms in soils is spatially heterogeneous at the microscale. Most soil carbon cycling models do not account for this microscale heterogeneity, which may affect predictions of carbon (C) f…
View article: Scaling up microbial dynamics for soil carbon cycling models
Scaling up microbial dynamics for soil carbon cycling models Open
<p>Soils are heterogeneous at all scales and so are the biogeochemical reactions driving the cycling of carbon (C) and nutrients in soils. While the microbial processes involved in these reactions occur at the pore scale, what we obs…
View article: New insights on carbon use efficiency using calorespirometry &#8211; a bioenergetics-based model
New insights on carbon use efficiency using calorespirometry – a bioenergetics-based model Open
<p>Soil organic carbon (SOC) represents both a source of energy (catabolism) and a building material for biosynthesis (anabolism) for microorganisms. Microbial carbon use efficiency (CUE) – the ratio of C used for biosynthe…
View article: Modelling respiration pulses at rewetting as a stochastic process
Modelling respiration pulses at rewetting as a stochastic process Open
<p>Respiration pulses at rewetting are prominent features of soil responses to soil moisture fluctuations. These pulses are much larger compared to respiration rates under constant soil moisture, pointing to variations in water avail…
View article: Final response
Final response Open
View article: Final response
Final response Open