Estimation of tree water stress from stem and soil water monitoring with time‐domain reflectometry in two small forested basins in Spain

Hernández‐Santana, Virginia; Martínez-Fernández, J.; Morán, Carlos

doi:10.1002/hyp.6845

Cited by 17 publications

(17 citation statements)

References 39 publications

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“…i . is an evergreen oak that grows slowly but can reach considerable size because of the hardness of its wood and is considered diffuse semi‐ring‐porous (Hernández‐Santana et al ., ); Q . p .…”

Section: Resultsmentioning

confidence: 85%

“…p . is a deciduous oak (Hernández‐Santana et al ., ) that grows mainly during summer and is characterized by ring‐porous wood of low density that frequently causes the collapse of large trees under their own weight.…”

Section: Resultsmentioning

confidence: 93%

“…Hernández‐Santana et al . (), through their observations of sapwood water storage depletion in Q . p ., stated that the daytime depletion was related with the high stomatal conductance and the lack of sensibility to water availability as described by Mediavilla and Escudero ().…”

Section: Resultsmentioning

confidence: 97%

“…() ring‐porous, tree species might not follow such calibration (Reis et al ., ; Steppe et al ., ). The first three listed TDP inaccuracies are handled in this study; the fourth and fifth are not because we did not experience any important bi‐directional flow as defined by HFD method and because the European oaks have a good and reliable TDP verification record (Granier et al ., ; David et al ., ; Hernández‐Santana et al ., ; Hernández‐Santana et al ., ).…”

Section: Introductionmentioning

confidence: 97%

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Optimization of dry‐season sap flow measurements in an oak semi‐arid open woodland in Spain

Reyes-Acosta

Lubczynski

2012

Ecohydrology

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In sap flow studies, there is no method complying with high efficiency and versatility of sap flow measurements. To improve that, we propose combining two methods: (1) thermal dissipation probe (TDP) known to be efficient and cost effective and (2) heat field deformation (HFD) known to be versatile. For that purpose, we used a step-wise TDP sap flux density (J p ) optimization method consisting of (1) natural temperature gradient (NTG) correction applying the cyclic heat dissipation (CHD) method, (2) night flow ΔT max correction using HFD data as reference and (3) radial-azimuthal correction using HFD as reference. We applied this optimization method on Quercus ilex (Q.i.) and Quercus pyrenaica (Q.p.) trees in a Spanish semi-arid open woodland during dry season. The NTG correction resulted in substantial reduction of J p as compared with standard TDP. The subsequent ΔT max night flow correction resulted in the increase of NTG-corrected J p and good agreement with the outermost 2 cm of HFD measurements for both species. The final radialazimuthal adjustment of TDP J p resulted not only, in a good agreement with HFD J p , but also provided novel ecohydrological insights such as: (1) evidence of continuous night flow in all Q.p. trees and some Q.i. trees, (2) exponential reduction of J p with sapwood depth for both species, (3) significantly larger J p in the outermost 1 cm of sapwood for Q.p. than for Q.i. and (4) high azimuthal J p variability for both species. The presented study offers efficient and versatile method of tree sap flow measurements that contributed to a better understanding of water-related dynamics of Q.i. and Q.p. under water-stress conditions.

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

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Optimization of dry‐season sap flow measurements in an oak semi‐arid open woodland in Spain

Reyes-Acosta

Lubczynski

2012

Ecohydrology

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“…Os trabalhos encontrados na literatura (Nadler et al, 2003;Nadler et al, 2006;Hernández-Santana, 2008) foram realizados em espécies arbóreas perenes como mangueira, limoeiro e carvalhos. O uso da técnica na cana-de-açúcar é um desafio, por se tratar de uma monocotiledônea (vasos condutores difusos), semi-perene, com corte anual, e com tendência a rachamento devido à disposição vertical de suas fibras.…”

Section: Resultsunclassified

Avaliação Da Técnica Da TDR No Monitoramento De Solução Xilemática Em Cana-De-Açúcar

Pavão

Souza²,

Bacalhau³

et al. 2014

R_I

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Compreender o comportamento da água nas plantas e no solo é uma ferramenta importante para um manejo adequado da água na agricultura. A técnica TDR pode auxiliar no monitoramento da água por ser um método preciso e não destrutivo, e ter potencial para monitorar a solução xilemática em plantas. O objetivo desse trabalho foi avaliar sondas TDR na estimativa da solução xilemática em cana-de-açúcar, correlacionando o conteúdo da solução no interior das plantas com a solução disponível no solo. O estudo foi realizado em área de segundo corte da variedade RB928064. Utilizaram-se oito plantas, e foi inserida uma sonda TDR com três hastes de 0,0016 m de diâmetro e 0,02 m de comprimento no quarto internódio e uma sonda TDR com três hastes de 0,003 m de diâmetro e 0,2 m de comprimento verticalmente no solo junto à planta. A umidade volumétrica e a condutividade elétrica das plantas e do solo foram monitoradas durante dezessete dias não consecutivos. Os resultados demonstraram que houve relação entre umidade da planta e do solo, mas não houve para a condutividade elétrica. Entretanto, para maior acurácia da técnica em plantas observa-se a necessidade de calibração com um método padrão de estimativa de solução xilemática.Palavras-chave: umidade do solo, condutividade elétrica, manejo da água. INTRODUÇÃOUm fator limitante na expansão das áreas agricultáveis é a escassez de água que limita a produtividade de plantas de interesse agronômico. O uso de técnicas de irrigação pode melhorar a eficiência e garantir precisão no aproveitamento da água pelas culturas (Chaves & Oliveira, 2004). A aplicação eficiente da água envolve, entre outros fatores, equipamentos modernos e um manejo adequado dos sistemas de irrigação. Significando uma aplicação precisa do volume de água com a frequência requerida pela planta. Para tanto, se faz necessário dispor de informações sobre as condições hídricas do solo e evapotranspiração da cultura (Delgado-Rojas, 2003).A quantidade de água absorvida pela planta pode ser determinada pela medição do fluxo da seiva xilemática, auxiliando no manejo quando submetidas a diferentes condições climáticas e hídricas do ambiente (Delgado-Rojas, 2006). Há vários métodos para estimar o consumo de água pelas plantas e a perda por transpiração, entre estes, o método direto denominado térmico (termopares) (Reis et al., 2009). Estes são aplicados diretamente em campo, sem alterar as condições microclimáticas e fisiológicas das plantas durante as aferições (Delgados-Rojas, 2003). Três métodos são mais usuais para estimar o fluxo de seiva: o método de dissipação de calor, o método do balanço de calor e o pulso de calor (Reis

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Soil moisture dynamics at high temporal resolution in a semiarid Mediterranean watershed with scattered tree cover

Lozano‐Parra

Schaik

Schnabel

et al. 2015

Hydrological Processes

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Abstract:Subsurface water flows play a key role in the distribution of water and solutes and thereby in the water availability for plants. However, the characterization of different flow processes (i.e. matrix and preferential flow), the frequency and factors that cause them, is relatively rare. This characterization enables a better understanding of spatio-temporal variability of water resources and allows for the design of models to be improved. Using a method based on the time derivative of soil moisture variation known as maximum wetting slope, types of soil wetting processes were classified and quantified. For this, capacitance sensors, which registered the volumetric water content at high temporal resolution (30 min) for more than two hydrological years, were installed at different depths and placed in soil moisture stations with different vegetation covers, lithology and topographic position. Results indicated that there is a general behaviour or pattern of soil moisture dynamics in the catchment with a dominant occurrence of slower soil wetting processes (>50%), caused by matrix flows, and a low occurrence of those faster processes (<30%), originated by preferential flows. Nevertheless, when the total volume of water is considered, preferential flow becomes the dominant process, so that the ecological role of both flow types becomes prominent in water-limited environments. Statistical multivariate analyses based on data-mining techniques proved that although both flow types depend on variables associated with precipitation and antecedent soil moisture conditions, faster soil wetting processes are mainly related to variables such as rainfall intensity and topography, while slower soil wetting processes are related to flow velocity, soils or vegetation.

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Estimation of tree water stress from stem and soil water monitoring with time‐domain reflectometry in two small forested basins in Spain

Cited by 17 publications

References 39 publications

Optimization of dry‐season sap flow measurements in an oak semi‐arid open woodland in Spain

Optimization of dry‐season sap flow measurements in an oak semi‐arid open woodland in Spain

Avaliação Da Técnica Da TDR No Monitoramento De Solução Xilemática Em Cana-De-Açúcar

Soil moisture dynamics at high temporal resolution in a semiarid Mediterranean watershed with scattered tree cover

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