Calibration and application of FOREST-BGC in a Mediterranean area by the use of conventional and remote sensing data

Chiesi, Marta; Maselli, Fabio; Bindi, Marco; Fibbi, Luca; Bonora, Laura; Raschi, A.; Tognetti, Roberto; Čermák, Jan; Nadezhdina, Nadezhda

doi:10.1016/s0304-3800(02)00057-1

Cited by 43 publications

(35 citation statements)

References 18 publications

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“…When the R nd ratio is negative during winter, the ET d yields negative values and the model does not perform well. Again, it is worth noting that ET d models are usually validated on spring or summer dates (Chiesi et al, 2002;Nagler et al, 2005Nagler et al, , 2007Sánchez et al, 2007Sánchez et al, , 2008aVerstraeten et al, 2005;Wu et al, 2006) when the daily R n budget is positive. Our attempt to also estimate ET d during autumn and winter has shown the limitations of the method and how ET d modelling needs to be further improved, especially in forest areas.…”

Section: Landsatmentioning

confidence: 99%

Combining remote sensing and GIS climate modelling to estimate daily forest evapotranspiration in a Mediterranean mountain area

Cristóbal

Poyatos

Ninyerola

et al. 2011

Hydrol. Earth Syst. Sci.

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Abstract. Evapotranspiration monitoring allows us to assess the environmental stress on forest and agricultural ecosystems. Nowadays, Remote Sensing and Geographical Information Systems (GIS) are the main techniques used for calculating evapotranspiration at catchment and regional scales. In this study we present a methodology, based on the energy balance equation (B-method), that combines remote sensing imagery with GIS-based climate modelling to estimate daily evapotranspiration (ET d ) for several dates between 2003 and 2005. The three main variables needed to compute ET d were obtained as follows: (i) Land surface temperature by means of the Landsat-5 TM and Landsat-7 ETM+ thermal band, (ii) air temperature by means of multiple regression analysis and spatial interpolation from meteorological ground stations data at satellite pass, and (iii) net radiation by means of the radiative balance. We calculated ET d using remote sensing data at different spatial and temporal scales (Landsat-7 ETM+, Landsat-5 TM and TERRA/AQUA MODIS, with a spatial resolution of 60, 120 and 1000 m, respectively) and combining three different approaches to calculate the B parameter, which represents an average bulk conductance for the daily-integrated sensible heat flux. We then compared these estimates with sap flow measurements from a Scots pine (Pinus sylvestris L.) stand in a Mediterranean mountain area. This procedure allowed us to better understand the limitations of ET d modelling and how it needs to be improved, especially in heterogeneous forest areas. The method Correspondence to: J. Cristóbal (jordi.cristobal@uab.cat) using Landsat data resulted in a good agreement, R 2 test of 0.89, with a mean RMSE value of about 0.6 mm day −1 and an estimation error of ±30 %. The poor agreement obtained using TERRA/AQUA MODIS, with a mean RMSE value of 1.8 and 2.4 mm day −1 and an estimation error of about ±57 and 50 %, respectively. This reveals that ET d retrieval from coarse resolution remote sensing data is troublesome in these heterogeneous areas, and therefore further research is necessary on this issue. Finally, implementing regional GIS-based climate models as inputs in ET d retrieval have has provided good results, making possible to compute ET d at regional scales.

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Section: Landsatmentioning

confidence: 99%

Combining remote sensing and GIS climate modelling to estimate daily forest evapotranspiration in a Mediterranean mountain area

Cristóbal

Poyatos

Ninyerola

et al. 2011

Hydrol. Earth Syst. Sci.

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“…chev et al 2002a, 2002b). Application of remote sensing technology is especially advantageous here (Chiesi et al 2001). In both cases, the landscape representative stands are specified on the corresponding maps and then identified in the field (Fig.…”

Section: Sap Flow Data From Experimental Stands To the Landscape Levelmentioning

confidence: 99%

Open field-applicable instrumental methods for structural and functional assessment of whole trees and stands

Čermák¹,

Nadezhdina²,

Trcala³

et al. 2015

iForest

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© iForest -Biogeosciences and Forestry Introduction 1Proper management of forest ecosystems from a biological perspective is dependent on classification of the natural environment for the purposes of phytotechnology (e.g., thinning operations) and forestry management. Functional management goals may include timber production as well as other important functions of forests in the landscape, such as water sources for people, but also for control of climate, maintenance of biological diversity, recreation, etc. for which importance often increases with time. Such functions have been working automatically in the past, but serious environmental impacts on forests associated with anthropogenic activities (e.g., air pollution, soil acidification) and global climatic change became apparent at the end of the 20 th century.Therefore long-term experience of foresters should be supplemented with additional objective information, which may be used to help solve new problems. This includes application of modern electronics, computers and other technologies, as well as collection of necessary data in the field especially pertaining to ecophysiology. This review provides only a brief description of methods suitable for studies at the whole tree and stand levels (and even higher levels). The methods are applicable under open forest conditions using mobile instrumentation approaches that can be used almost everywhere. They were tested in more than 60 sites and in over 50 woody species in Europe, USA and Australia. We focused on measurement and evaluation of macrostructure and water flow, because the maximum energy flow in ecosystems goes through water and water is the most frequent natural limiting factor of tree growth and functional states of whole trees and stands (if not considering polar regions and tops of high mountains). Ecologically oriented scientific fields and practically oriented field activities in forestry, arboristics, horticulture, hydrology, remote sensing and forensic engineering use many traditional and modern methods.Annual and seasonal stem growth are probably the most frequently studied processes in forestry. Usually institutions for forest management (IFM) base their practices on this valuable data on a large scale (e.g., national), which provide crucial information about timber production and yield. A great body of literature is available on this topic. However, strategy for the management of forest ecosystems in Europe elaborated over several centuries is focused on classification of the natural environment and determining potential natural vegetation and oriented not only toward production but also on preserving other important functions of forests in the landscape. A detailed version of this approach was successfully applied for over 80 years. The eventual impact of anthropogenic activities and global climatic changes led to development of ecophysiological methods applied to evaluate the functional state and development of forest ecosystems.These methods were usually overlooked in the past because prev...

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“…The understorey layer is generally characterized by the presence of young trees of the main dominant species (especially natural regeneration) and shrubs of different species. Transpiration (actually sap flow) was measured during the 1998 growing season (MayOctober) in two oak stands of about 1 ha, the first dominated by Q. cerris and the second by Q. pubescens [Chiesi et al, 2002]. A full description of the technique currently applied to measure sap flow in forest ecosystems is reported in Cermak et al [1998].…”

Section: Collection Of Transpiration Measurements For the Forest Sitementioning

confidence: 99%

“…Two case studies concern fields covered by winter and summer crops, for which reference ET A profiles are produced through a classical Kc method [Battista et al 2003]. The third experiment is conducted in a forest area covered by Mediterranean deciduous oaks where transpiration measurements were taken during a previous investigation [Chiesi et al, 2002]. After these tests, examples of the operational use of the method for monitoring ET A in Tuscany are shown and commented.…”

Section: Introductionmentioning

confidence: 99%

Combination of ground and satellite data for the operational estimation of daily evapotranspiration

Chiesi

Rapi

Battista

et al. 2013

European Journal of Remote Sensing

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A recent paper of our research group has proposed a simplified "water balance" model which predicts actual evapotranspiration (ET A ) based on ground and remotely sensed data. The model combines estimates of potential evapotranspiration (ET 0 ) and of fractional vegetation cover derived from NDVI in order to separately simulate transpirative and evaporative processes. The new method, named NDVI-Cws, was validated against latent heat measurements taken by the eddy covariance technique over various vegetation types in Central Italy. The current paper extends this validation to three other test sites in Tuscany for which reference data are obtained from different sources. In the first two sites (nonirrigated winter wheat and irrigated maize fields) seasonal reference ET A data series are obtained by the WinEtro model. In situ transpiration measurements are instead used as reference data for a deciduous oak forest stand. The ET A and transpiration estimates of the NDVI-Cws method are very similar to the reference data in terms of both annual totals and seasonal evolutions. Examples are finally provided of the model application for operationally monitoring ET A in Tuscany.

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Calibration and application of FOREST-BGC in a Mediterranean area by the use of conventional and remote sensing data

Cited by 43 publications

References 18 publications

Combining remote sensing and GIS climate modelling to estimate daily forest evapotranspiration in a Mediterranean mountain area

Combining remote sensing and GIS climate modelling to estimate daily forest evapotranspiration in a Mediterranean mountain area

Open field-applicable instrumental methods for structural and functional assessment of whole trees and stands

Combination of ground and satellite data for the operational estimation of daily evapotranspiration

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