Depth of water uptake in woody plants relates to groundwater level and vegetation structure along a topographic gradient in a neotropical savanna

Rossatto, Davi Rodrigo; Silva, Lucas C. R.; Villalobos-Vega, R; Sternberg, Leonel da Silveira Lobo; Franco, Augusto C.

doi:10.1016/j.envexpbot.2011.11.025

Cited by 132 publications

(98 citation statements)

References 45 publications

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“…In plant ecology stable water isotopes provide a powerful method for determining seasonal changes in plant water uptake (Corbin et al, 2005;Eggemeyer et al, 2009;Butt et al, 2010;Liu et al, 2010), intra-and interspecific resource competition of plants (Williams and Ehleringer, 2000;Yang et al, 2011), partitioning evaporation and transpiration (Wang and Yakir, 2000;Phillips and Gregg, 2003;Rothfuss et al, 2010Rothfuss et al, , 2012, partitioning of water resources between plants ( Stratton et al, 2000;Rossatto et al, 2012), and community wateruse patterns or the zones of root activity in soils (Ehleringer and Dawson, 1992;Thorburn and Ehleringer, 1995;Dawson and Pate, 1996;Liu et al, 2011). Plant water uptake is considered as a non-fractionating process (Wershaw et al, 1966;Dawson and Ehleringer, 1991;Walker and Richardson, 1991;Thorburn et al, 1993;Dawson and Ehleringer, 1993) for non-saline conditions (Lin and Sternberg, 1993), implying that the isotopic signature of the source water remains the same during soil water uptake and water transport through plants (White et al, 1985).…”

Section: Introductionmentioning

confidence: 99%

Validation and application of a cryogenic vacuum extraction system for soil and plant water extraction for isotope analysis

Orlowski

Frede

Brüggemann

et al. 2013

J. Sens. Sens. Syst.

156

222

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Abstract. Stable isotopic analysis of water in plant, soil, and hydrological studies often requires the extraction of water from plant or soil samples. Cryogenic vacuum extraction is one of the most widely used and accurate extraction methods to obtain such water samples. Here, we present a new design of a cryogenic vacuum extraction system with 18 extraction slots and an innovative mechanism to aerate the vacuum system after extraction. This mobile and extendable multi-port extraction system overcomes the bottleneck of time required for capturing unfractionated extracted water samples by providing the possibility to extract a larger number of samples per day simultaneously. The aeration system prevents the loss or mixture of water vapor during defrosting by purging every sample with high-purity nitrogen gas. A set of system functionality tests revealed that the extraction device guarantees stable extraction conditions with no changes in the isotopic composition of the extracted water samples. Surprisingly, extractions of dried and rehydrated soils showed significant differences of the isotopic composition of the added water and the extracts. This observation challenges the assumption that cryogenic extraction systems to fully extract soil water. Furthermore, in a plant water uptake study different results for hydrogen and oxygen isotope data were obtained, raising problems in the definition from which depths plants really take up water. Results query whether the well-established and widely used cryogenic vacuum distillation method can be used in a standard unified method of fixed extraction times as it is often done.

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Section: Introductionmentioning

confidence: 99%

Validation and application of a cryogenic vacuum extraction system for soil and plant water extraction for isotope analysis

Orlowski

Frede

Brüggemann

et al. 2013

J. Sens. Sens. Syst.

156

222

View full text Add to dashboard Cite

show abstract

“…Groundwater provides a source of water for evapotranspiration even during dry seasons or drought conditions (Yeh et al 1998;Gutowski et al 2002;Miguez-Macho and Fan 2012). In fact, some plants are highly reliant on groundwater (Orellana et al 2012;Rossatto et al 2012). Roots have been documented down to around 18 m in the Amazon (Nepstad et al 1994) and even deeper elsewhere (Canadell et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Implementing and Evaluating Variable Soil Thickness in the Community Land Model, Version 4.5 (CLM4.5)

et al. 2016

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One of the recognized weaknesses of land surface models as used in weather and climate models is the assumption of constant soil thickness because of the lack of global estimates of bedrock depth. Using a 30-arc-s global dataset for the thickness of relatively porous, unconsolidated sediments over bedrock, spatial variation in soil thickness is included here in version 4.5 of the Community Land Model (CLM4.5). The number of soil layers for each grid cell is determined from the average soil depth for each 0.98 latitude 3 1.258 longitude grid cell. The greatest changes in the simulation with variable soil thickness are to baseflow, with the annual minimum generally occurring earlier. Smaller changes are seen in latent heat flux and surface runoff primarily as a result of an increase in the annual cycle amplitude. These changes are related to soil moisture changes that are most substantial in locations with shallow bedrock. Total water storage (TWS) anomalies are not strongly affected over most river basins since most basins contain mostly deep soils, but TWS anomalies are substantially different for a river basin with more mountainous terrain. Additionally, the annual cycle in soil temperature is partially affected by including realistic soil thicknesses resulting from changes in the vertical profile of heat capacity and thermal conductivity. However, the largest changes to soil temperature are introduced by the soil moisture changes in the variable soil thickness simulation. This implementation of variable soil thickness represents a step forward in land surface model development.

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“…An interesting approach that has some operational advantages is indirect parameter estimation techniques based on regression. These techniques are referred to as pedo-transfer-functions (PTFs) and they relate soil hydraulic functions to readily available soil properties (Rossatto et al, 2012). The relationships are developed from comprehensive soil data bases and in some manner they also incorporate the effect of variability and scale.…”

Section: Introductionmentioning

confidence: 99%

Effect of Unsaturated Flow Model Conceptualization on the Dynamic Response of an Integrated Distributed Hydrological Model

Lu¹

2017

Appl Ecol Env Res

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Abstract. Water dynamics in the unsaturated zone is one of the most important processes as it controls model precision. One of the limitations in using a catchment model based on a Richards' equation is the huge amount of parameters required to run the model. In this study, we investigate the effect of unsaturated flow conceptualization models on the dynamic response of an integrated distributed hydrological model, which are (1) Richards equation (simple parameterization RI2) (2) Two layer water balance model (TLM). The physically based distributed modelling system, MIKESHE is applied to the Skjern catchment with the objective to test and analyze the effect of using different models for unsaturated flow on the dynamic response of an integrated distributed hydrological model. Results from this study show that regarding peak discharge at the catchment outlet follows the TLM, RI2 sequence. Similar results were found for the discharge characteristics of the sub basin. The close agreement between the simulated results of the two models also indicates that the simple TLM model is more suitable than the complex Richard equation model at least for the condition of the Skjern catchment, while its weaknesses is not describing the groundwater dynamics well.

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Depth of water uptake in woody plants relates to groundwater level and vegetation structure along a topographic gradient in a neotropical savanna

Cited by 132 publications

References 45 publications

Validation and application of a cryogenic vacuum extraction system for soil and plant water extraction for isotope analysis

Validation and application of a cryogenic vacuum extraction system for soil and plant water extraction for isotope analysis

Implementing and Evaluating Variable Soil Thickness in the Community Land Model, Version 4.5 (CLM4.5)

Effect of Unsaturated Flow Model Conceptualization on the Dynamic Response of an Integrated Distributed Hydrological Model

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