Alessio Collalti

Alessio Collalti
Italian National Research Council | CNR · Institute for Agricultural and Forestry Systems in the Mediterranean

Ph.D. in Forest Ecology
Senior Researcher and Forest Modelling Lab. head

About

138
Publications
40,315
Reads
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1,627
Citations
Citations since 2016
113 Research Items
1543 Citations
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20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
Introduction
Alessio Collalti has a Master Science Degree in Natural Sciences and a Ph.D. in Forest Ecology. His background concerns Forest Ecology, Carbon, Water and Nitrogen Cycle, Forest and Vegetation Modelling, particularly with regard to vegetation numerical modelling and response under natural and anthropogenic stress, including climate change impacts and forest management scenarios He is the Forest Modelling Lab. head and a senior researcher at CNR.
Additional affiliations
May 2016 - present
Italian National Research Council
Position
  • Researcher
January 2016 - December 2018
Fondazione Centro Euro-Mediterraneo sui Cambiamenti Climatici
Position
  • Researcher
September 2011 - December 2015
Education
September 2007 - March 2011
Tuscia University
Field of study
  • Forest Ecology
September 1999 - March 2006
Sapienza University of Rome
Field of study
  • Botany

Publications

Publications (138)
Article
Full-text available
Forest production efficiency (FPE) metric describes how efficiently the assimilated carbon is partitioned into plants organs (biomass production, BP) or-more generally-for the production of organic matter (net primary production, NPP). We present a global analysis of the relationship of FPE to stand-age and climate, based on a large compilation of...
Article
Two simplifying hypotheses have been proposed for whole‐plant respiration. One links respiration to photosynthesis; the other to biomass. Using a first‐principles carbon balance model with a prescribed live woody biomass turnover, applied at a forest research site where multidecadal measurements are available for comparison, we show that if turnove...
Article
Full-text available
Gross primary production (GPP) is partitioned to autotrophic respiration (Ra) and net primary production (NPP), the latter being used to build plant tissues and synthesize non-structural and secondary compounds. Waring et al. (1998) suggested that a NPP:GPP ratio of 0.47 ± 0.04 (s.d.) is universal across biomes, tree species and stand ages. Represe...
Article
Mediterranean pine plantations provide several ecosystem services but are vulnerable to climate change. Forest management might play a strategic role in the adaptation of Mediterranean forests, but the joint effect of climate change and diverse management options have seldom been investigated together. Here, we simulated the development of a Larici...
Article
Full-text available
Forest management practices might act as nature-based methods to remove CO2 from the atmosphere and slow anthropogenic climate change and thus support an EU forest-based climate change mitigation strategy. However, the extent to which diversified management actions could lead to quantitatively important changes in carbon sequestration and stocking...
Poster
Full-text available
Simulazione dell'accoppiamento tra assimilazione del carbonio ed accrescimenti in quattro siti forestali "Eddy-Covariance"
Preprint
Full-text available
Forest management practices might act as nature-based methods to remove CO2 from the atmosphere and slow anthropogenic climate change and thus support an EU forest-based climate change mitigation strategy. However, the extent to which diversified management actions could lead to quantitatively important changes in carbon sequestration and stocking...
Data
The Inter-Sectoral Impact Model Intercomparison Project (ISIMIP) provides a framework for the collation of a set of consistent, multi-sector, multi-scale climate-impact simulations, based on scientifically and politically relevant historical and future scenarios. This framework serves as a basis for robust projections of climate impacts, as well as...
Article
Full-text available
Forest models are instrumental for understanding and projecting the impact of climate change on forests. A considerable number of forest models have been developed in the last decades. However, few systematic and comprehensive model comparisons have been performed in Europe that combine an evaluation of modelled carbon and water fluxes and forest s...
Article
Full-text available
Although it is an integral part of global change, most of the research addressing the effects of climate change on forests have overlooked the role of environmental pollution. Similarly , most studies investigating effects of air pollutants on forests have generally neglected impacts of climate change. We review the current knowledge on combined ai...
Technical Report
Full-text available
The 3D-CMCC-FEM (“Three Dimensional - Coupled Model Carbon Cycle - Forest Ecosystem Model”) is a computer model and is primarily a research tool, and many versions have been developed for specific purposes. The National Research Council of Italy and University of Tuscia maintain benchmark code versions for public release and update these benchmark...
Conference Paper
Full-text available
Forest ecosystems contribute significantly to the global carbon cycle by absorbing and storing CO 2 , thus potentially mitigating the effuects of anthropogenic climate change. The Mediterranean region, one of the world's biodiversity and climate change hotspots, is projected to become dryer and warmer in the future, with an increased likelihood of...
Conference Paper
Full-text available
The Mediterranean basin is a well-known drought-prone region, nevertheless it has been affuected by unprecedented extreme climate events over the last decades which are projected to lead to an even drier and warmer climate in this region. Process-based forest models are versatile tools being able to simulate forest stand growth and structure under...
Conference Paper
Full-text available
Forest management can aid buffuering anthropogenic climate change, thus playing a strategic role in the framework of the EU forestry-based carbon mitigation strategy, in particular in Central and Northern Europe. To what extent a diversified management portfolio would lead to effuective changes in carbon sequestration potential at the tree level re...
Conference Paper
Full-text available
We present an R-based tool that allows to set up and run the Three Dimensional-Coupled Model Carbon Cycle-Forest Ecosystem Model (3D-CMCC-FEM). It provides an intuitive interface to perform model simulations controlling several parameters while implementing consistency checks on the model inputs. The overall tool consists of a folder containing the...
Conference Paper
Full-text available
Gross Primary Productivity, tree growth and carbon reserve under climate change: the modelling case study of a dieback Quercus forest in San Paolo Albanese (Pollino National Park) The interplay between gross primary productivity and plant growth under the impact of summer drought events is mediated by the tree carbon reserves. To investigate how pl...
Preprint
Full-text available
Mediterranean pine plantations provide several ecosystem services but are particularly sensitive to climate change. Forest management practices might play a strategic role in the long-term adaptation of Mediterranean forests, however the joint effect of climate change and alternative management options together in the near and far future must be in...
Article
Full-text available
Tropospheric ozone (O3) is one of the most concernedair pollutants dueto its widespread impacts on land vegetated ecosystems and human health. Ozone is also the third greenhouse gas for radiative forcing. Consequently, it should be carefully and continuously monitored to estimate its potential adverse impacts especially inthose regions where concen...
Article
Surface ozone (O3) is a threat to forests by decreasing photosynthesis and, consequently, influencing the strength of land carbon sink. However, due to the lack of continuous surface O3 measurements, -p observational-based assessments of O3 impacts on forests are largely missing at hemispheric to global scales. Currently, some metrics are used for...
Article
Ecological research heavily relies on coarse-­gridded climate data based on standardized temperature measurements recorded at 2 m height in open landscapes. However, many organisms experience environmental conditions that differ substantially from those captured by these macroclimatic (i.e. free air) temperature grids. In forests, the tree canopy f...
Article
Full-text available
Climate change is affecting natural ecosystems and society. Anticipating its impacts on vegetation resilience is critical to estimate the ecosystems’ response to global changes and the reliability of the related ecosystem services, to support mitigation actions, and to define proper adaptation plans. Here, we compute the Annual Production Resil...
Article
This study aimed to simulate oak and beech forest growth under various scenarios of climate change and to evaluate how the forest response depends on site properties and particularly on stand characteristics using the individual process-based model HETEROFOR. First, this model was evaluated on a wide range of site conditions. We used data from 36 l...
Book
Full-text available
Terrestrial ecosystems and forests in particular, are important components because of their key role in reducing atmospheric greenhouse gas concentrations by storing a large amount of carbon in biomass and soils. Increasing attention is being paid to forestland area, which accounts for 30% of the total land surface and acts as the main C store in t...
Article
Extreme weather events are increasing in frequency and intensity due to global climate change. We hypothesized that tree carbon reserves are crucial for resilience of beech, buffering the source-sink imbalance due to late frosts and summer droughts, and that different components of non-structural carbohydrates (NSCs) play specific roles in coping w...
Article
Full-text available
1. Understanding the processes that shape forest functioning, structure, and diversity remains challenging, although data on forest systems are being collected at a rapid pace and across scales. Forest models have a long history in bridging data with ecological knowledge and can simulate forest dynamics over spatio-temporal scales unreachable by mo...
Article
Full-text available
p>The following authors were omitted from the original version of this Data Descriptor: Markus Reichstein and Nicolas Vuichard. Both contributed to the code development and N. Vuichard contributed to the processing of the ERA-Interim data downscaling. Furthermore, the contribution of the co-author Frank Tiedemann was re-evaluated relative to the co...
Article
Full-text available
Terrestrial ecosystems, and forests in particular, are important components of land processes because of their key role in reducing atmospheric greenhouse gas concentrations by storing a large amount of carbon in tree biomass and soils. Increasing attention is being paid to forestland area, which accounts for 30% of the total land surface and acts...
Article
Full-text available
In recent decades, droughts, deforestation and wildfires have become recurring phenomena that have heavily affected both human activities and natural ecosystems in Amazonia. The time needed for an ecosystem to recover from carbon losses is a crucial metric to evaluate disturbance impacts on forests. However, little is known about the impacts of the...
Data
The present dataset belongs the paper: Collalti A., Ibrom A., Stockmarr A., Cescatti A., Alkama R., Fernández-Martínez M., Matteucci G., Sitch S., Friedlingstein P., Ciais P., Goll D.S., Nabel J.E.M.S., Pongratz J., Arneth A., Haverd V., Prentice I.C.. “Forest production efficiency increases with growth temperature", Nature Communications, 11, 5322...
Preprint
Full-text available
Extreme weather events are increasing in frequency and intensity due to global climate change. We hypothesized that thesehave a strong impact on the stem radial growth and the dynamic of non-structural carbohydrates (NSCs). In order to assessthe effects on mature trees of a late frost occurred in spring 2016 and a drought event characterizing the s...
Preprint
Full-text available
Extreme weather events are increasing in frequency and intensity due to global climate change. We hypothesized that these have a strong impact on the stem radial growth and the dynamic of non-structural carbohydrates (NSCs). In order to assess the effects on mature trees of a late frost occurred in spring 2016 and a drought event characterizing the...
Article
Full-text available
Shallow landslides are an increasing concern in Italy and worldwide because of the frequent association with vegetation management. As vegetation cover plays a fundamental role in slope stability, we developed a GIS-based model to evaluate the influence of plant roots on slope safety, and also included a landslide susceptibility map. The GIS-based...
Preprint
Full-text available
In the last decades droughts, deforestation and wildfires have become recurring phenomena that have affected both human activities and natural ecosystems in Amazonia. The time an ecosystem requires to recover from carbon losses is a crucial metric to evaluate disturbance impacts on forests. However, the factors influencing and controlling the recov...
Article
The effects of short-term extreme events on tree functioning and physiology are still rather elusive. European beech is one of the most sensitive species to late frost and water shortage. We investigated the intra-annual C dynamics in stems under such conditions. Wood formation and stem CO2 efflux were monitored in a Mediterranean beech forest for...
Article
Full-text available
The FLUXNET2015 dataset provides ecosystem-scale data on CO2, water, and energy exchange between the biosphere and the atmosphere, and other meteorological and biological measurements, from 212 sites around the globe (over 1500 site-years, up to and including year 2014). These sites, independently managed and operated, voluntarily contributed their...
Article
Full-text available
The FLUXNET2015 dataset provides ecosystem-scale data on CO2, water, and energy exchange between the biosphere and the atmosphere, and other meteorological and biological measurements, from 212 sites around the globe (over 1500 site-years, up to and including year 2014). These sites, independently managed and operated, voluntarily contributed their...
Thesis
Full-text available
The soil stores more carbon than the whole atmosphere and vegetation together, about 1950 Pg, as well as an amount of nitrogen 20 times higher than the quantity stored in the standing vegetation of either forests or cultivations. Furthermore, soil exchanges several greenhouse gases which entrap the long-wavelength radiation, causing an increase of...
Article
Full-text available
In his recent communication on our original paper 1,2 , D. Kelly, claiming that nutrient scarcity cannot select for masting behaviour in plants, initiated a fruitful discussion on traditionally settled hypotheses about the evolution of reproductive behaviour in plants. In his commentary, Kelly raises support for a contrasting hypothesis explaining...
Article
The effects of short‐term extreme events on tree functioning and physiology are still rather elusive. European beech is one of the most sensitive species to late frost and water shortage. We investigated the intra‐annual C dynamics in stems under such conditions. Wood formation and stem CO2 efflux were monitored in a Mediterranean beech forest for...
Article
Full-text available
Process-based vegetation models are widely used to predict local and global ecosystem dynamics and climate change impacts. Due to their complexity, they require careful parameterization and evaluation to ensure that projections are accurate and reliable. The PROFOUND Database (PROFOUND DB) provides a wide range of empirical data on European forests...
Article
Full-text available
Climate change likely represents the major modifying agents of functional and structural processes in terrestrial and marine ecosystems. Its importance lies in the fact that the space-time dynamics through which it acts on environmental systems are scale dependent and, consequently, the responses are also dependent on the space scale. Writing, ther...
Preprint
Full-text available
Introductory paragraph We present a global analysis of the relationship of forest production efficiency (FPE) to stand age and climate, based on a large compilation of data on gross primary production and either biomass production or net primary production. FPE is important for both forest production and atmospheric carbon dioxide uptake. Earlier f...
Article
Full-text available
Models of trees and stands exist since many decades, what nowadays has changed is our focus towards integrated forest ecosystem functioning. Managing forests in the 21 st century requires efforts that go beyond empiricism. Annikki Mäkelä and Harry T. Valentine's new book "Models of tree and stand dynamics" (Springer Nature, Cham, 2020) shows the st...
Conference Paper
Full-text available
The long-term research and monitoring site of Collelongo - Selva Piana has been established in 1991 (Abruzzo Region, Central Italy, 1560 m elevation) in the framework of a project on ecology and silviculture of European beech. In 1993, the site was the first forest in Europe where canopy fluxes started to be measured with the eddy covariance techni...
Article
Full-text available
Carbon allocation plays a key role in ecosystem dynamics and plant adaptation to changing environmental conditions. Hence, proper description of this process in vegetation models is crucial for the simulations of the impact of climate change on carbon cycling in forests. Here we review how carbon allocation modelling is currently implemented in 31...
Article
Full-text available
Mast seeding is one of the most intriguing reproductive traits in nature. Despite its potential drawbacks in terms of fitness, the widespread existence of this phenomenon suggests that it should have evolutionary advantages under certain circumstances. Using a global dataset of seed production time series for 219 plant species from all of the conti...
Preprint
Full-text available
Process-based vegetation models are widely used to predict local and global ecosystem dynamics and climate change impacts. Due to their complexity, they require careful parameterization and evaluation to ensure that projections are accurate and reliable. The PROFOUND Database (PROFOUND DB) provides a wide range of empirical data to calibrate and ev...
Poster
Full-text available
LANDSUPPORT aims at building up a web-based smart geoSpatial Decision Support System (S-DSS) providing a set of operational tools devoted to: i) support sustainable forest management ii) evaluate trade-off between land uses; iii) contribute to implementation, impact and delivery of about 20 European land policies and selected 2030 UN Sustainable De...
Conference Paper
Full-text available
I cicli di carbtonito e aztotto all’internto dei sutoli ftorestali rivesttonto un rutolto chiave nelle interazitoni tra ectosistema e clima. Il prtocessto di dectomptosizitone della stostanza torganica regtola il sequestrto di carbtonito nel sutolto e le emis - sitoni in atmtosfera di anidride carbtonica (CO 2 ) e metanto (CH 4 ) ctonnesse all’ativ...
Article
Full-text available
Vegetation phenology and its variability have substantial influence on land-atmosphere interaction, and changes in growing season length are additional indicators of climate change impacts on ecosystems. For these reasons, global land surface models are routinely evaluated in order to assess their ability to reproduce the observed phenological vari...
Preprint
Full-text available
The effects of short-term extreme events on tree functioning are still rather elusive. Considering beech one of the most sensible species to late frost and water shortage, we investigate the intra-annual C dynamics in stems under such conditions. Wood formation and stem CO2 efflux were monitored in a Mediterranean beech forest for three years (2015...
Preprint
Full-text available
Two simplifying hypotheses have been proposed for whole-plant respiration. One links respiration to photosynthesis; the other to biomass. Using a first-principles carbon balance model with a prescribed live woody biomass turnover, we show that if turnover is fast, the accumulation of respiring biomass is low and respiration depends primarily on pho...
Data
Current process-based vegetation models are complex scientific tools that require proper evaluation of the different processes included in the models to prove that the models can be used to integrate our understanding of forest ecosystems and project climate change impacts on forests. The PROFOUND database (PROFOUND DB) described here aims to bring...
Article
Full-text available