Root distribution and water use in coffee shaded with Tabebuia rosea Bertol. and Simarouba glauca DC. compared to full sun coffee in sub-optimal environmental conditions

Padovan, Maria da Penha; Cortez, V. J.; Navarrete, Ledis; Navarrete, Elvin; Deffner, Anna C.; Centeno, Leonardo García; Munguía, Rodolfo; Barrios, Mirna; Vílchez-Mendoza, J. S.; Vega-Jarquín, Carolina; Costa, Aureliano Nogueira da; Brook, R.M.; Rapidel, Bruno

doi:10.1007/s10457-015-9820-z

Cited by 56 publications

(63 citation statements)

References 27 publications

(25 reference statements)

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“…However, regardless of canopy cover, we found no significant relationship between SWC and lc‐excess of bulk soil water samples collected at 15 cm depth during the wet season. According to our conceptual model (Figure b), this would suggest that transpiration is the dominant process influencing surface soil water moisture during the wet season, which is consistent with previous studies that have shown enhanced transpiration by shade trees can lead to reduced soil moisture in tropical agroforestry systems (Cannavo et al, ; Ong & Leakey, ; Padovan et al, ). Thus, small‐scale variation and reduced surface soil moisture beneath shade trees compared with under coffee during the wet season likely reflects greater tree transpiration during the wet season when leaves are fully expanded.…”

Section: Discussionsupporting

confidence: 90%

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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Section: Discussionsupporting

confidence: 90%

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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“…In our study, the water availability always decreased earlier with the period of severe depletion (i.e., "hardly available water") lasting longer at the shaded area. Padovan et al (2015) had similar results showing that after a severe dry period volumetric water and water uptake were lower in a coffee agroforestry system than in unshaded coffee. Also consistent with our results, Harmand et al (2007) reported that at the end of the dry season the soil water content of the 0-120 cm layer was higher in an unshaded coffee plantation than in a shaded area.…”

Section: Figure3mentioning

confidence: 55%

Impact of tree shading on the microclimate of a coffee plantation: a case study from the Peruvian Amazon

Ehrenbergerová¹,

Šenfeldr

Habrová

2018

Bois for. trop.

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L’agroforesterie est considérée comme l’une des stratégies agricoles pouvant contribuer à l’adaptation des cultures au changement climatique. La présente étude de cas visait à comparer les conditions microclimatiques d’une parcelle de Coffea arabica cultivée sous ombrage, principalement Inga spp., et celles d’une parcelle de C. arabica menée en monoculture sans ombrage dans la même plantation de café, dans la région de Pasco au Pérou. La température et l’humidité de l’air, la température du sol et la disponibilité en eau du sol ont été mesurées pendant trois ans. Les résultats indiquent que l’ombrage des arbres réduit la température moyenne de l’air de 0,4 ± 0,04 °C et la température du sol de 1,7 ± 0,3 °C, et augmente l’humidité de l’air de 3,9 ± 0,4 % par rapport à la zone sans ombrage. Cependant, la moyenne mensuelle des températures de l’air dans la zone non ombragée, et même la température maximale, ne dépassent pas outre mesure la limite permettant la photosynthèse (seuil 34 °C). De plus, les températures minimales mensuelles diffèrent peu entre les zones ombragées et non ombragées, alors que la fluctuation des températures du sol est plus marquée dans la zone non ombragée. Un des principaux constats de cette étude concerne la sécheresse plus marquée des sols dans la zone ombragée, surtout au début et à la fin de la saison sèche. Ceci s’explique probablement par l’augmentation de la transpiration totale par celle des arbres d’ombrage. L’absorption d’eau plus importante en agroforesterie pourrait ainsi avoir un impact négatif sur la croissance des caféiers dans les situations où la disponibilité en eau est un facteur limitatif.

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“…Furthermore, the species of shade tree affects PAR interception (COELHO et al, 2010), evaporative rates (PADOVAN et al, 2018;PADOVAN et al, 2015), air (RICCI et al, 2013;VALENTINI et al, 2010) and soil temperature, as well as thermal amplitude (RICCI et al, 2013).…”

Section: Canopy Density and Canopyoccupation Ratementioning

confidence: 99%

Effects of Shade Tree Spatial Distribution and Species on Photosynthetic Rate of Coffee Trees

Neto

Bonfanti

Gazaffi

et al. 2019

C.Sci.

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The use of shade trees in coffee fields have been motivated by climatic changes. However, microclimatic conditions in shaded coffee fields differ due to shade tree spatial distribution and species, altering physiological responses of coffee trees. This study aimed to evaluate the effects of shade tree spatial distribution and species on coffee trees photosynthetic rate in two growth seasons, of high (HSD) and low (LSD) sink demand. The experimental design consisted of randomized blocks with three replicates in split-split-plots. Plots were the shade tree species: Anadenanthera falcata, Cassia grandis and Peltophorum dubium. Split plot was formed by five distances between coffee trees and shade tree trunks: coffee trees on planting row of shade trees, distancing one (D1L) and five (D5L) meters from shade trees trunk; coffee trees on inter-rows of shade trees, parallel to D1L and D5L (D1E and D5E); coffee trees distancing 77 meters from shade tree trunks, in a full-sun field (PS). The split-split-plots correspond to coffee tree canopy exposure to the sun: branches facing North or South. Shade trees canopy density and occupation was evaluated with a convex densiometer. Photosynthetic rate (Pn)and photosynthetic active radiation (PAR) were measured with an Infrared Gas Analyzer (IRGA) on two time-frames, between 7.00 and 9.00 solar hours and between 11.00 and 13.00. Shade tree canopy density and occupation was not homogenous during the change of seasons and shift due to spatial distribution, which also changes PAR levels. Shade trees reduce PAR to more suitable values for coffee tree exploitation, especially on D1L and D5L. During HSD, shading did not affect Pn, which was greater in branches facing North. Yet, in LSD, between 11.00 and 13.00, coffee trees shaded with A. falcata showed greater Pn than at PS. Coffee trees shaded with C. grandis at D5L and D1E had greater values of Pn than PS.

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Root distribution and water use in coffee shaded with Tabebuia rosea Bertol. and Simarouba glauca DC. compared to full sun coffee in sub-optimal environmental conditions

Cited by 56 publications

References 27 publications

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

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

Impact of tree shading on the microclimate of a coffee plantation: a case study from the Peruvian Amazon

Effects of Shade Tree Spatial Distribution and Species on Photosynthetic Rate of Coffee Trees

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