Large topsoil organic carbon variability is controlled by Andisol properties and effectively assessed by VNIR spectroscopy in a coffee agroforestry system of Costa Rica

Kinoshita, Rintaro; Roupsard, Olivier; Chevallier, Tiphaine; Albrecht, Alain; Taugourdeau, Simon; Ahmed, Zia; Es, Harold M. van

doi:10.1016/j.geoderma.2015.08.026

Cited by 24 publications

(20 citation statements)

References 59 publications

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“…The soils within the study region are classified as Andisols, using the United States Department of Agriculture soil taxonomy. This soil order is characterized as having at least 60% andic soil properties in the upper 60 cm of the soil profile (United States Department of Agriculture, 1999), with high levels of soil organic content (Kinoshita et al, 2016). Andisols in the study region tend to have very high infiltration capacity, therefore resulting in almost no overland run-off (Benegas, Ilsted, Roupsard, Jones, & Malmer, 2013;Gómez-Delgado et al, 2011;Spaans et al, 1989).…”

Section: Mejías Creek Watershedmentioning

confidence: 99%

Isotope hydrology of a tropical coffee agroforestry watershed: Seasonal and event‐based analyses

Welsh

Boll

Sánchez‐Murillo

et al. 2018

Hydrological Processes

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Stable isotope variations are extremely useful for flow partitioning within the hydrologic cycle but remain poorly understood throughout the tropics, particularly in watersheds with rapidly infiltrating soils, such as Andisols in Central America. This study examines the fluctuations of stable isotope ratios (δ18O and δ2H) in the hydrologic components of a tropical coffee agroforestry watershed (~1 km2) with Andisol soils in Costa Rica. Samples were collected in precipitation, groundwater, springs, and stream water over 2 years. The local meteoric water line for the study site was δ2H = 8.5 δ18O + 18.02 (r2 = 0.97, n = 198). The isotope ratios in precipitation exhibited an enriched trend during the dry season and a notable depletion at the beginning of the wet season. The δ18O compositions in groundwater (average = −6.4‰, σ = 0.7) and stream water (average = −6.7‰, σ = 0.6) were relatively stable over time, and both components exhibited more enriched values in 2013, which was the drier year. No strong correlation was observed between the isotope ratios and the precipitation amount at the event or daily time‐step, but a correlation was observed on a monthly scale. Stream water and base flow hydrograph separations based on isotope end‐member estimations showed that pre‐event water originating from base flow was prevalent. However, isotope data indicate that event water originating from springs appears to have been the primary driver of initial rises in stream flow and peak flows. These results indicate that isotope sampling improves the understanding of water balance components, even in a tropical humid location, where significant variations in rainfall challenge current modelling efforts. Further research using fine‐scale hydrometric and isotopic data would enhance understanding the processes driving spring flow generation in watersheds.

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Section: Mejías Creek Watershedmentioning

confidence: 99%

Isotope hydrology of a tropical coffee agroforestry watershed: Seasonal and event‐based analyses

Welsh

Boll

Sánchez‐Murillo

et al. 2018

Hydrological Processes

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“…1a). Soils are deep andisols with high allophane and organic matter content (Kinoshita et al 2016). Volumetric water content of the soil ranged from 0.38 to 0.55 m 3 H2O m À3 soil and was never limiting for plants (Gomez-Delgado et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Increased light‐use efficiency sustains net primary productivity of shaded coffee plants in agroforestry system

Charbonnier

Roupsard

Maire

et al. 2017

Plant Cell & Environment

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In agroforestry systems, shade trees strongly affect the physiology of the undergrown crop. However, a major paradigm is that the reduction in absorbed photosynthetically active radiation is, to a certain extent, compensated by an increase in light-use efficiency, thereby reducing the difference in net primary productivity between shaded and non-shaded plants. Due to the large spatial heterogeneity in agroforestry systems and the lack of appropriate tools, the combined effects of such variables have seldom been analysed, even though they may help understand physiological processes underlying yield dynamics. In this study, we monitored net primary productivity, during two years, on scales ranging from individual coffee plants to the entire plot. Absorbed radiation was mapped with a 3D model (MAESPA). Light-use efficiency and net assimilation rate were derived for each coffee plant individually. We found that although irradiance was reduced by 60% below crowns of shade trees, coffee light-use efficiency increased by 50%, leaving net primary productivity fairly stable across all shade levels. Variability of aboveground net primary productivity of coffee plants was caused primarily by the age of the plants and by intraspecific competition among them (drivers usually overlooked in the agroforestry literature) rather than by the presence of shade trees.

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“…Mean annual precipitation at the site is 3,014 mm year −1 (based on a 40‐year record from 1973 to 2010), with lower rainfall between January and April (i.e., “drier” season) compared with other times of the year, but devoid of drought (Gómez‐Delgado et al, ). Soils at the site belong to the order of Andisols, Eutra (USDA, ), with high contents of organic carbon ranging between 5% and 17%, high allophane contents (Kinoshita et al, ), and distinct layers with coarse textures.…”

Section: Methodsmentioning

confidence: 99%

Canopy cover effects on local soil water dynamics in a tropical agroforestry system: Evaporation drives soil water isotopic enrichment

Hasselquist

Benegas

Roupsard

et al. 2018

Hydrological Processes

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Despite the widely held assumption that trees negatively affect the local water budget in densely planted tree plantations, we still lack a clear understanding of the underlying processes by which canopy cover influences local soil water dynamics in more open, humid tropical ecosystems. In this study, we propose a new conceptual model that uses a combination of stable isotope and soil moisture measurements throughout the soil profile to assess potential mechanisms by which evaporation (of surface soil water and of canopy-intercepted rainfall) affects the relationship between surface soil water isotopic enrichment (lc-excess) and soil water content. Our conceptual model was derived from soil water data collected under deciduous and evergreen plants in a shade grown coffee agroforestry system in Costa Rica. Reduced soil moisture under shade trees during the "drier" season, coinciding when these trees were defoliated, was largely the result of increase soil water evaporation as indicated by the positive relationship between soil water content and lc-excess of surface soil water. In contrast, the evergreen coffee shrubs had a higher leaf area index during the "drier" season, leading to enhanced rainfall interception and a negative relationship between lc-excess and soil water content. During the wet season, there was no clear relationship between soil water content and between lc-excess of surface soil water. Greater surface soil water under coffee during the dry season may, in part, explain greater preferential flow under coffee compared with under trees in conditions of low rainfall intensities. However, with increasing rainfall intensities during the wet season, there was no obvious difference in preferential flow between the two canopy covers. Results from this study indicate that our new conceptual model can be used to help disentangling the relative influence of canopy cover on local soil water isotopic composition and dynamics, yet also stresses the need for additional measurements to better resolve the underlying processes by which canopy structure influences local water dynamics.

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Large topsoil organic carbon variability is controlled by Andisol properties and effectively assessed by VNIR spectroscopy in a coffee agroforestry system of Costa Rica

Cited by 24 publications

References 59 publications

Isotope hydrology of a tropical coffee agroforestry watershed: Seasonal and event‐based analyses

Isotope hydrology of a tropical coffee agroforestry watershed: Seasonal and event‐based analyses

Increased light‐use efficiency sustains net primary productivity of shaded coffee plants in agroforestry system

Canopy cover effects on local soil water dynamics in a tropical agroforestry system: Evaporation drives soil water isotopic enrichment

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