Modelling the spectral response of the desert tree Prosopis tamarugo to water stress

Chávez, Roberto O.; Clevers, J.G.P.W.; Herold, Martin; Ortiz, Mauricio; Acevedo, Edmundo

doi:10.1016/j.jag.2012.08.013

Cited by 32 publications

(47 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Investigators identified the range up to 10-12 m as an optimal range for tamarugo survival, considering historical distribution and water status retrieved from NDVI metrics. Taking into account the historical distribution of P. tamarugo at depths less than 18-20 m, that trees getting close to this WTD presented a green canopy fraction (GCF) of 0.25 (established by Chávez et al 2013b as a threshold for tamarugo conservation), and that beyond this threshold trees can no longer perform pulvinar movements to avoid direct high solar radiation accelerating the drying process, the conclusions of this research suggested a groundwater depth of 20 m as a threshold for tamarugo's survival.…”

Section: Physiological Responsesmentioning

confidence: 97%

“…Studies on the magnitude of the impacts and the extent and the thresholds for P. tamarugo's survival are required for environmental impact assessment and water as well as basin management (Chávez et al 2013b). …”

Section: Water Table Depth Physiological Responses and Tamarugo Decmentioning

confidence: 99%

“…Through the use of remote sensing, Chávez et al (2013b) (Chávez et al 2013b). Investigators identified the range up to 10-12 m as an optimal range for tamarugo survival, considering historical distribution and water status retrieved from NDVI metrics.…”

Section: Physiological Responsesmentioning

confidence: 99%

See 2 more Smart Citations

Prosopis tamarugo Phil.: a native tree from the Atacama Desert groundwater table depth thresholds for conservation

Calderón

Garrido

Acevedo

2015

Rev. Chil. de Hist. Nat.

View full text Add to dashboard Cite

Prosopis tamarugo Phil. is a legume tree native to the Atacama Desert, Chile. Tamarugo has physiological characteristics that are highly adapted to extreme life conditions in the Pampa del Tamarugal. Null precipitation makes tamarugo completely dependent on groundwater, developing in areas where the groundwater depth is closest to the surface. Groundwater extraction for domestic consumption, mining, and agriculture affects the desert ecosystem by lowering the water table. Measuring and describing the impacts on vegetation through the monitoring of physiological variables along with groundwater depletion in salt flats where extraction wells are located has contributed to a better understanding of tamarugo response to this stress factor. Integrated variables such as green canopy fraction, normalized difference vegetation index (NDVI), 18 O isotope enrichment in foliar tissue, and twig growth proved to be far more reactive toward groundwater depth increase and presented lower error values. These variables respond to mechanisms that tamarugo has to maintain a stable water condition when water offer (water table depth (WTD)) decreases regarding water demand (transpiration). Defoliation along with twig growth diminishment would combine toward a canopy reduction strategy in order to reduce water demand. Green biomass loss, beyond a certain WTD, would lead to complete drying of the tamarugo. Up to 10 m of groundwater table depth, Tamarugo grows, has photosynthetic activity, and has the ability to perform pulvinary movements. Beyond 20 m of water table depth, tamarugo survival is compromised and hydraulic failure is inferred to occur. The current scenario is of groundwater over-exploitation; if economic efforts will be made to conserve and/or restore tamarugo, habitat groundwater extraction is a key element in effective management. Reaching of the thresholds depends on the adequate authority management of groundwater. The objectives of this review are (a) to review information collected from scientific studies regarding tamarugo condition and its response, over time, to WTD increase, (b) to identify WTD thresholds that affect tamarugo's functioning, and (c) to propose a sequence of physiological events triggered by groundwater (GW) depletion.

show abstract

Section: Physiological Responsesmentioning

confidence: 97%

Section: Water Table Depth Physiological Responses and Tamarugo Decmentioning

confidence: 99%

See 1 more Smart Citation

Prosopis tamarugo Phil.: a native tree from the Atacama Desert groundwater table depth thresholds for conservation

Calderón

Garrido

Acevedo

2015

Rev. Chil. de Hist. Nat.

View full text Add to dashboard Cite

show abstract

“…This spectral constraint has changed since 2009, when the WorldView2 satellite was launched, providing VHSR images with six bands in the visible region and two bands in the near infra-red region. In the near future (2014), the WorldView3 will provide images with the same eight bands of WorldView2 plus eight additional bands in the short-wave-infra-red region, opening new opportunities for the retrieval of biophysical properties of small desert features [8].…”

Section: Introductionmentioning

confidence: 99%

Assessing Water Stress of Desert Tamarugo Trees Using in situ Data and Very High Spatial Resolution Remote Sensing

et al. 2013

View full text Add to dashboard Cite

Abstract:The hyper-arid Atacama Desert is one of the most extreme environments for life and only few species have evolved to survive its aridness. One such species is the tree Prosopis tamarugo Phil. Because Tamarugo completely depends on groundwater, it is being threatened by the high water demand from the Chilean mining industry and the human consumption. In this paper, we identified the most important biophysical variables to assess the water status of Tamarugo trees and tested the potential of WorldView2 satellite images to retrieve these variables. We propose green canopy fraction (GCF) and green drip line leaf area index (DLLAI green ) as best variables and a value of 0.25 GCF as a critical threshold for Tamarugo survival. Using the WorldView2 spectral bands and an object-based image analysis, we showed that the NDVI and the Red-edge Chlorophyll Index (CI Red-edge ) have good potential to retrieve GCF and DLLAI green . The NDVI performed best for DLLAI green (RMSE = 0.4) while the CI Red-edge was best for GCF (RMSE = 0.1). However, both indices were affected by Tamarugo leaf movements (leaves avoid facing direct solar radiation at the hottest time of the day). Thus, monitoring systems OPEN ACCESSRemote Sens. 2013, 5 5065 based on these indices should consider the time of the day and the season of the year at which the satellite images are acquired.

show abstract

“…In paper [14], as in the above studies, the spectral responses of desert trees were investigated. The obtained results create prerequisites for obtaining information on the nature of bioproduction processes by remote methods.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Mathematical modeling of the colorimetric parameters for remote control over the state of natural bioplato

Balym

Georgiyants

Vуsotska

et al. 2017

EEJET

View full text Add to dashboard Cite

Modelling the spectral response of the desert tree Prosopis tamarugo to water stress

Cited by 32 publications

References 64 publications

Prosopis tamarugo Phil.: a native tree from the Atacama Desert groundwater table depth thresholds for conservation

Prosopis tamarugo Phil.: a native tree from the Atacama Desert groundwater table depth thresholds for conservation

Assessing Water Stress of Desert Tamarugo Trees Using in situ Data and Very High Spatial Resolution Remote Sensing

Mathematical modeling of the colorimetric parameters for remote control over the state of natural bioplato

Contact Info

Product

Resources

About