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

Charbonnier, Fabien; Roupsard, Olivier; Maire, Guerric le; Guillemot, Joannès; Casanoves, Fernando; Lacointe, André; Vaast, Philippe; Allinne, Clémentine; Audebert, Louise; Cambou, Aurélie; Clément‐Vidal, Anne; Defrenet, Elsa; Duursma, Remko A.; Jarri, Laura; Jourdan, Christophe; Khac, Emmanuelle; Leandro, Patricia; Medlyn, Belinda E.; Saint‐André, Laurent; Thaler, Philippe; Meersche, Karel Van den; Aguilar, Alejandra Barquero; Lehner, Peter; Dreyer, Erwin

doi:10.1111/pce.12964

Cited by 93 publications

(97 citation statements)

References 88 publications

(153 reference statements)

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“…However, the increase in carbon assimilation cannot balance transpired water, contributing to the weakened WUE (Moualeu‐Ngangue et al, ). On the contrary, topographic shading effects in CTRL may compensate for the decreased photosynthetically active radiation level by enhancing light use efficiency, thus maintaining net carbon assimilation (Charbonnier et al, ).…”

Section: Modeling Results Analysismentioning

confidence: 99%

Why Do Large‐Scale Land Surface Models Produce a Low Ratio of Transpiration to Evapotranspiration?

et al. 2018

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Most land surface models (LSMs) used in Earth System Models produce a lower ratio of transpiration (T) to evapotranspiration (ET) than field observations, degrading the credibility of Earth System Model‐projected ecosystem responses and feedbacks to climate change. To interpret this model deficiency, we conducted a pair of model experiments using a three‐dimensional, process‐based ecohydrological model in a subhumid, mountainous catchment. One experiment (CTRL) describes lateral water flow, topographic shading, leaf dynamics, and water vapor diffusion in the soil, while the other (LSM like) does not explicitly describe these processes to mimic a conventional LSM using artificially flattened terrain. Averaged over the catchment, CTRL produced a higher T/ET ratio (72%) than LSM like (55%) and agreed better with an independent estimate (79.79 ± 27%) based on rainfall and stream water isotopes. To discern the exact causes, we conducted additional model experiments, each reverting only one process described in CTRL to that of LSM like. These experiments revealed that the enhanced T/ET ratio was mostly caused by lateral water flow and water vapor diffusion within the soil. In particular, terrain‐driven lateral water flows spread out soil moisture to a wider range along hillslopes with an optimum subrange from the middle to upper slopes, where evaporation (E) was more suppressed by the drier surface than T due to plant uptake of deep soil water, thereby enhancing T/ET. A more elaborate representation of water vapor diffusion from a dynamically changing evaporating surface to the height of the surface roughness length reduced E and increased the T/ET ratio.

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Section: Modeling Results Analysismentioning

confidence: 99%

Why Do Large‐Scale Land Surface Models Produce a Low Ratio of Transpiration to Evapotranspiration?

et al. 2018

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“…This show that it is responsible to shade and could be interesting in breeding program for agroforestry system (AFS) adaptation. Charbonnier et al (2017), working with light-use efficiency in coffee plants shaded, verified that although irradiance was reduced by 60% below crowns of shade trees, coffee light-use efficiency increased by 50%. Based on this information, imagine that the genotype 06V uses more efficiently the light than genotypes 03V and 12V.…”

Section: Productive Parameters and Grain Yieldmentioning

confidence: 97%

Vegetative growth and yield of robusta coffee genotypes cultivated under different shading levels

Venâncio¹,

Amaral²,

Cavatte³

et al. 2019

Biosci. J.

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The growing in shaded systems is one of the strategies adopted to mitigate the impacts of climate change on coffee trees. However, there are few studies about the effect of shading on the growth and production of clones of robusta coffee (Coffea canephora). Besides that, exist a paradigm in Brazil of that the shading in coffee robusta is synonymous of less yield. Thus, the aim of this work was to evaluate whether C. canephora genotypes subjected to shading increase their yield and growth vegetative under field conditions. The study was performed between September 2013 and July 2017 (four harvests) in Alegre, Espírito Santo state, Brazil. Three genotypes of cultivar Conilon Vitória -Incaper 8142 were evaluated (03V, 06V, and 12V) and four levels of shade: full sunlight (witness) and, low, moderate and, high shade, with 38, 48 and, 68% of real capacity of shade, respectively. The shade was performed using black polyolefin screens; plants growing in full sunlight were only fenced. The tested shade levels affected the growth rate and yield of Robusta coffee plants. The shading caused a greater leaf expansion as compared to the full sunlight, as well as greater etiolation of the plagiotropic and orthotropic branches. The genotype 06V was shown to be responsive to shading, with a statistically equal production independently of shade level. The low, moderate, and high shade levels affected negatively the yield of genotypes 03V and 12V. The shading can improve the yield of Robusta coffee, in this case, of the genotype 06V of the cultivar Conilon Vitória -Incaper 8142. The success of shaded plantations depends the choice of the shade responsive genotypes and appropriate shading level. of cafe Robusta, directing in the development of new studies with this objective. ACKNOWLEDGEMENTSThis study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior -Brasil (CAPES) -Finance Code 001, by Conselho Nacional de Desenvolvimento Científico e Tecnológico -Brasil (CNPq), and by Fundação de Amparo à Pesquisa e Inovação do Espírito Santo -Brasil (FAPES). RESUMO:O cultivo em sistemas sombreados é uma das estratégias adotadas para mitigar os impactos da mudança climática sobre os cafeeiros. No entanto, existem poucos estudos sobre o efeito do sombreamento no crescimento e produção de clones de café robusta (Coffea canephora). Além disso, existe um paradigma no Brasil de que o sombreamento nesta espécies é sinônimo de menor rendimento. Assim, o objetivo do presente trabalho foi avaliar se os genótipos de C. canephora submetidos ao sombreamento aumentam sua produtividade e crescimento vegetativo em condições de campo. O estudo foi realizado entre setembro de 2013 e julho de 2017 (quatro safras) em Alegre, Espírito Santo, Brasil. Três genótipos da cultivar Conilon Vitória -Incaper 8142 foram avaliados (03V, 06V e 12V) e quatro níveis de sombreamento: pleno sol (testemunha) e baixo, moderado e alto nível de sombreamento, com 34, 48 e 68% de capacidade real de sombreamento, respectivamente, obtidos com o uso d...

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“…This indicates that other factors impact the latitude effect at the regional scale. The influence of sunshine duration and sunlight intensity on primary productivity and productivity on diversity have also been widely recognized [32][33][34][35][36][37], whereas the relative importance of sunshine duration on diversity remains unclear.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dominated Driving Mechanisms of the Plant Diversity in Temperate Forests, Northeast China

Han

Zhang

et al. 2020

Forests

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Climate, topography, and tree structure have different effects on plant diversity that vary with spatial scale. In this study, we assessed the contribution of these drivers and how they affect the vascular plant richness of different functional groups in a temperate forest ecosystem in Northeast China. We investigated about 0.986 million plants from 3160 sites to quantify the impact of annual mean temperature, sunshine duration, annual precipitation, standard deviation of diameter at breast height, and forest type on richness of vascular plants (total species, tree, treelet, shrub, and herb, separately) using the gradient boosting model. The results show that annual mean temperature had the strongest impact on plant richness. The tree richness peaked at intermediate annual mean temperature and sunshine duration and increased with annual precipitation. The Shannon diversity index and Simpson dominance index increased with annual precipitation and standard deviation of diameter at breast height, decreased with sunshine duration, and peaked at intermediate annual mean temperature and forest type. The total richness and understory richness increased with annual mean temperature and standard deviation of diameter at breast height and peaked at intermediate sunshine duration and annual precipitation. A comprehensive mechanism was found to regulate the plant diversity in forest ecosystems. The relationship between tree richness and annual mean temperature with latitudinal effect could be affected by the differences in number and size of tree individuals, indicating that plant diversity varies with the utilization of energy. The force driving plant richness varied with the functional group due to the different environmental resource requirements and the life history strategies of plants layers.

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

Cited by 93 publications

References 88 publications

Why Do Large‐Scale Land Surface Models Produce a Low Ratio of Transpiration to Evapotranspiration?

Why Do Large‐Scale Land Surface Models Produce a Low Ratio of Transpiration to Evapotranspiration?

Vegetative growth and yield of robusta coffee genotypes cultivated under different shading levels

Temperature-Dominated Driving Mechanisms of the Plant Diversity in Temperate Forests, Northeast China

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