The role of hydrology on enhanced weathering for carbon sequestration I. Modeling rock-dissolution reactions coupled to plant, soil moisture, and carbon dynamics

Cipolla, Giuseppe; Calabrese, Salvatore; Noto, Leonardo; Porporato, Amilcare

doi:10.1016/j.advwatres.2021.103934

Cited by 23 publications

(32 citation statements)

References 31 publications

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“…Further studies will be needed, not only at the landscape or regional scale but also at a shorter spatial scale, such as this catena-scale study to elucidate these hydrological effects in more detail. Some authors have pointed to important feedbacks with plants that definitely can have a significant impact on soil hydrology and perhaps also a direct influence on chemical weathering processes (Cipolla et al, 2021;Porada et al, 2016).…”

Section: Locationmentioning

confidence: 99%

Modelling the effect of catena position and hydrology on soil chemical weathering

García-Gamero¹,

Vanwalleghem²,

Peña³

et al. 2022

SOIL

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Abstract. The sensitivity of chemical weathering to climatic and erosional forcing is well established at regional scales. However, soil formation is known to vary strongly along catenas where topography, hydrology, and vegetation cause differences in soil properties and, possibly, chemical weathering. This study applies the SoilGen model to evaluate the link between the topographic position and hydrology with the chemical weathering of soil profiles on a north–south catena in southern Spain. We simulated soil formation in seven selected locations over a 20 000-year period and compared it against field measurements. There was good agreement between simulated and measured chemical depletion fraction (CDF; R2=0.47). An important variation in CDF values along the catena was observed that is better explained by the hydrological variables than by the position along the catena alone or by the slope gradient. A positive trend between CDF data and soil moisture and infiltration and a negative trend with water residence time was found. This implies that these hydrological variables are good predictors of the variability in soil properties. The model sensitivity was evaluated with a large precipitation gradient (200–1200 mm yr−1). The model results show an increase in the chemical weathering of the profiles up to a mean annual precipitation value of 800 mm yr−1, after which it drops again. A marked depth gradient was obtained for CDF up to 800 mm yr−1, and a uniform depth distribution was obtained with precipitation above this threshold. This threshold reflects a change in behaviour, where the higher soil moisture and infiltration lead to shorter water transit times and decreased weathering. Interestingly, this corroborates similar findings on the relation of other soil properties to precipitation and should be explored in further research.

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Section: Locationmentioning

confidence: 99%

Modelling the effect of catena position and hydrology on soil chemical weathering

García-Gamero¹,

Vanwalleghem²,

Peña³

et al. 2022

SOIL

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“…Goll et al (2021) used a comprehensive land surface model coupled to a model of mineral dissolution to simulate the effect of nutrient release from basalt on plant growth and ecosystem carbon storage. Cipolla et al (2021) coupled an ESW component to an ecohydrological‐biogeochemical soil model to investigate the combined contributions of hydrology and plants to weathering rates. Beerling et al (2020) used a one‐dimensional vertical reactive transport model with the steady‐state flow, and a source term representing rock grain dissolution which includes an empirical formulation for the combined effect of biotic processes that accelerate the physical breakdown and chemical dissolution of minerals.…”

Section: Advances In Modeling Eswmentioning

confidence: 99%

Is the climate change mitigation effect of enhanced silicate weathering governed by biological processes?

Vicca

Goll

Hagens

et al. 2021

Global Change Biology

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A number of negative emission technologies (NETs) have been proposed to actively remove CO 2 from the atmosphere, with enhanced silicate weathering (ESW) as a relatively new NET with considerable climate change mitigation potential. Models calibrated to ESW rates in lab experiments estimate the global potential for inorganic carbon sequestration by ESW at about 0.5-5 Gt CO 2 year −1 , suggesting ESW could be an important component of the future NETs mix. In real soils, however, weathering rates may differ strongly from lab conditions. Research on natural weathering has shown that biota such as plants, microbes, and macro-invertebrates can strongly affect weathering rates, but biotic effects were excluded from most ESW lab assessments. Moreover, ESW may alter soil organic carbon sequestration and greenhouse gas emissions by influencing physicochemical and biological processes, which holds the potential to perpetuate even larger negative emissions. Here, we argue that it is likely that the climate change mitigation effect of ESW will be governed by biological processes, emphasizing the need to put these processes on the agenda of this emerging research field.

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“…Recent field evidence documents vegetation dependency on rock moisture during dry periods or extended droughts (Carrière et al, 2020;Klos et al, 2018;Hahm et al, 2020;Jiang et al, 2020;Nardini et al, 2021;Qi et al, 2018;Rempe and Dietrich, 2018) and the dependence of maximum rooting depths on the in situ hydrological regulation (Fan et al, 2017). However, consideration of rock moisture in current models is scarce, and the few examples are linked to model rock weathering processes (Cipolla et al, 2021), leaving aside its role for root water uptake and plant transpiration (Fan et al, 2019). From a pragmatic modeling perspective, the inclusion of this additional source of water could be achieved either by implementing a bottomless soil column allowing the exponential root profile to access deep soil water (de Rosnay and Polcher, 1998) or deepening the DTB and/or altering the soil composition for the bedrock layers.…”

Section: Introductionmentioning

confidence: 99%

Exploring the role of bedrock representation on plant transpiration response during dry periods at four forested sites in Europe

2022

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Abstract. Forest transpiration is controlled by the atmospheric water demand, potentially constrained by soil moisture availability, and regulated by plant physiological properties. During summer periods, soil moisture availability at sites with thin soils can be limited, forcing the plants to access moisture stored in the weathered bedrock. Land surface models (LSMs) have considerably evolved in the description of the physical processes related to vegetation water use, but the effects of bedrock position and water uptake from fractured bedrock have not received much attention. In this study, the Community Land Model version 5.0 (CLM 5) is implemented at four forested sites with relatively shallow bedrock and located across an environmental gradient in Europe. Three different bedrock configurations (i.e., default, deeper, and fractured) are applied to evaluate if the omission of water uptake from weathered bedrock could explain some model deficiencies with respect to the simulation of seasonal transpiration patterns. Sap flow measurements are used to benchmark the response of these three bedrock configurations. It was found that the simulated transpiration response of the default model configuration is strongly limited by soil moisture availability at sites with extended dry seasons. Under these climate conditions, the implementation of an alternative (i.e., deeper and fractured) bedrock configuration resulted in a better agreement between modeled and measured transpiration. At the site with a continental climate, the default model configuration accurately reproduced the magnitude and temporal patterns of the measured transpiration. The implementation of the alternative bedrock configurations at this site provided more realistic water potentials in plant tissues but negatively affected the modeled transpiration during the summer period. Finally, all three bedrock configurations did not show differences in terms of water potentials, fluxes, and performances on the more northern and colder site exhibiting a transition between oceanic and continental climate. Model performances at this site are low, with a clear overestimation of transpiration compared to sap flow data. The results of this study call for increased efforts into better representing lithological controls on plant water uptake in LSMs.

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The role of hydrology on enhanced weathering for carbon sequestration I. Modeling rock-dissolution reactions coupled to plant, soil moisture, and carbon dynamics

Cited by 23 publications

References 31 publications

Modelling the effect of catena position and hydrology on soil chemical weathering

Modelling the effect of catena position and hydrology on soil chemical weathering

Is the climate change mitigation effect of enhanced silicate weathering governed by biological processes?

Exploring the role of bedrock representation on plant transpiration response during dry periods at four forested sites in Europe

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