Alejandro Miranda

Alejandro Miranda
Universidad de La Frontera · Department of Forest Science

Ph.D.

About

52
Publications
20,213
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554
Citations
Introduction
I am a natural resource engineer at University of Chile with a Doctorate in Forest Ecosystems and Natural Resources at Austral University of Chile. Currently I am adjoint researcher at both the Department of Forest Science, Universidad de La Frontera and of the Center for Climate and Resilience Research (CR2) , as well as postdoctoral researcher at the Complex Engineering Systems Institute (ISCI) of the University of Chile.
Additional affiliations
October 2018 - present
University of Chile
Position
  • PostDoc Position
January 2010 - July 2015
Universidad de La Frontera
Position
  • Researcher

Publications

Publications (52)
Article
Achieving a local understanding of fire regimes requires high-resolution, systematic and dynamic databases. High-quality information can help to transform evidence into decision-making in the context of rapidly changing landscapes, particularly considering that geographical and temporal patterns of fire regimes and their trends vary locally over ti...
Preprint
Ecosystem collapse in direct response to climate change is a critical but poorly documented phenomenon. By assessing the climate context and productivity trends in Mediterranean ecosystems worldwide, we found a large-scale, abrupt forest decline in Chile (>90% in <100 days) as response to a sustained, acute drought unprecedented in the recent histo...
Preprint
Achieving a local understanding of fire regimes requires high resolution, systematic and dynamic databases. Highquality information can help to transform the evidence into decision-making in the context of rapidly changing landscapes, particularly considering that geographical and temporal patterns of fire regimes and their trends vary locally over...
Article
Full-text available
Recolonization of wind-dispersed tree species in degraded areas may decline with distance from remnant forest fragments because seed rain frequently decreases with distance from the seed source. However, regeneration of these species may be even more limited to sites close to the seed source if dispersal distance is negatively affected by seed mass...
Article
The growing demand for timber and the boom in massive tree-planting programs could mean the spreading of mismanaged tree plantations worldwide. Here, we apply the concept of ecological intensification to forestry systems as a viable biodiversity-focused strategy that could be critical to develop productive, yet sustainable, tree plantations. Tree p...
Article
Full-text available
Fire plays a dominant role in deforestation, particularly in the tropics, but the relative extent of transformations and influence of fire frequency on eventual forest loss remain unclear. Here, we analyze the frequency of fire and its influence on postfire forest trajectories between 2001 and 2018. We account for ~1.1% of Latin American forests bu...
Article
Full-text available
Freshwater inputs strongly influence oceanographic conditions in coastal systems of northwestern Patagonia (41–45ºS). Nevertheless, the influence of freshwater on these systems has weakened in recent decades due to a marked decrease in precipitation. Here we evaluate potential influences of climate and land cover trends on the Puelo River (640 m3s−...
Article
Increasing wildfire activity globally has become an urgent issue with enormous ecological and social impacts. In this work, we focus on analyzing and quantifying the influence of landscape topology, understood as the spatial structure and interaction of multiple land-covers in an area, on fire ignition. We propose a deep learning framework, Deep Fi...
Article
The strong link between climate change and increased wildfire risk suggests a paradigm change on how humans must co-exist with fire and the environment. Different studies have demonstrated that human-induced fire ignitions can account for more than 90 % of forest fires, so human coexistence with wildfires requires informed decision making via preve...
Article
As president of the Climate Change Conference of the Parties, Chile has advocated for developing ambitious commitments to mitigate greenhouse gas emissions to achieve carbon-neutrality by 2050. However, Chile’s motivations and ambitious push to reach carbon-neutrality are complicated by a backdrop of severe drought, climate change impacts (i.e., wi...
Article
Full-text available
Data collection from large areas of native forests poses a challenge. The present study aims at assessing the use of UAV for forest inventory on native forests in Southern Chile, and seeks to retrieve both stand and tree level attributes from forest canopy data. Data were collected from 14 plots (45 × 45 m) established at four locations representin...
Article
Full-text available
Data collection from large areas of native forests poses a challenge. The present study aims at assessing the use of UAV for forest inventory on native forests in Southern Chile, and seeks to retrieve both stand and tree level attributes from forest canopy data. Data were collected from 14 plots (45 × 45 m) established at four locations representin...
Conference Paper
Full-text available
Increasing wildfire activity across the globe has become an urgent issue with enormous ecological and social impacts. While there is evidence that landscape topology affects fire growth, no study has yet reported its potential influence on fire ignition. This study proposes a deep learning framework focused on understanding the impact of different...
Chapter
Full-text available
Much progress has been made in remotely detecting forest loss, particularly by using satellite imagery. However, quantification of different stages of forest degradation continues to be challenging. Compared with satellites, UAVs (or drones) can deliver images of much higher spatial resolution and enable estimation of forest characteristics with gr...
Article
Full-text available
Distinguising between natural forests from exotic tree plantations is essential to get an accurate picture of the world’s state of forests. Most exotic tree plantations support lower levels of biodiversity and have less potential for ecosystem services supply than natural forests, and differencing them is still a challenge using standard tools. We...
Chapter
Full-text available
En el presente informe se resume la estrategia de evaluación del Riesgo climático en bosque nativo y en plantaciones forestales ante incendios forestales, y la evaluación del efecto directo del clima en la productividad fotosintética de ambos sistemas en función de los cambios recientes en precipitación y temperatura.
Article
Full-text available
The wildland-urban interface (WUI) is the spatial manifestation of human communities coupled with vegetated ecosystems. Spatial delineation of the WUI is important for wildfire policy and management, but is typically defined according to spatial relationships between housing development and wildland vegetation without explicit consideration of fire...
Article
Full-text available
Understanding of people’s landscape preferences is important for decision-making about land planning, particularly in the disturbance patterns that usually occur in rural-urban gradients. However, the use of different types of images concerning the same landscape may influence social preferences and thus perceptions of landscape management and plan...
Article
Deforestation is widely studied throughout the world. However, a less evident issue is the effect of climate change and drought on remnants of native forests. The objective of this work was to understand the geographic variations in resistance to drought of the Mediterranean sclerophyllous forests of central Chile. These forests have been historica...
Technical Report
Full-text available
Los resultados presentados en este informe son parte del trabajo interdisciplinario que realiza el Centro de Ciencia del Clima y la Resiliencia (CR)2. El (CR)2 es un centro de excelencia financiado por el programa FONDAP de CONICYT (Proyecto 15110009) en el cual participan cerca de 60 científicos asociados a la Universidad de Chile, la Universidad...
Book
Full-text available
La submesa Cambio de Uso del Suelo (CUS) tuvo como objetivo compilar y presentar en un informe la evidencia científica disponible sobre los cambios de uso del suelo y sus impactos en relación con las opciones de mitigación del cambio climático. Esta submesa contó con la participación de más de 30 científicos de diversas áreas de las ciencias ambien...
Chapter
http://www.inap.uchile.cl/publicaciones/159662/informe-pais-estado-del-medio-ambiente-en-chile-2018
Article
Full-text available
The presence and attributes of perch trees in degraded areas may promote seed dispersal. We evaluated the effect of the distance from remnant forest fragments on seed rain of different fleshy-fruit tree species and examined whether the seed rain is favoured by some traits of the perch trees (Acacia caven), such as canopy diameter and tree height. T...
Poster
Full-text available
In this poster we present a series of practical and methodological guidelines for correctly operating UAV's and collecting data for scientific studies. This guidelines are based on our experience of monitoring landscapes in extreme weather conditions such as those found in north-western Patagonia, Chile, where high nubosity, intermitent rain and hi...
Technical Report
Full-text available
En el siglo XXI, el desarrollo de Chile está en juego debido a las amenazas planteadas por el Antropoceno. Esta época se caracteriza por la influencia humana sobre el sistema terrestre. Sin embargo, si se enfrenta con audacia, ofrece una oportunidad para un desarrollo sostenible. Independientemente de si hemos entrado en una nueva era geológica, el...
Article
Guidance for large-scale restoration of natural or semi-natural linear vegetation elements that takes into account the need to maintain human livelihoods such as farming is often lacking. Focusing on a Chilean biodiversity hotspot, we assessed the landscape in terms of existing woody vegetation elements and proposed a buffer strip and hedgerow netw...
Article
Full-text available
El monitoreo de los bosques es fundamental para la toma de decisiones de manejo y conservación. En Chile, el sistema de monitoreo de bosques se inició en el año 1994, y se ha mantenido mediante la realización de actualizaciones regionales. Esto ha permitido hacer un seguimiento temporal de la superficie, distribución y características del bosque na...
Article
Full-text available
The understanding of the spatial and temporal patterns in land use and land cover (LULC) change is a key issue for conservation efforts. In the Chilean hotspot, different studies have attempted to understand variations of LULC change. Nevertheless, a broader understanding of common patterns and variability of LULC over the entire range of the hotsp...
Article
Full-text available
Ulex europaeus (gorse) is an invasive shrub deemed as one of the most invasive species in the world. U. europaeus is widely distributed in the south-central area of Chile, which is considered a world hotspot for biodiversity conservation. In addition to its negative effects on the biodiversity of natural ecosystems, U. europaeus is one of the most...
Article
Full-text available
Jubaea chilensis es un árbol endémico de la zona central de Chile (31º15’- 35º22’ S). Las principales amenazas actuales a su conservación estarían asociadas a diferentes limitantes a su regeneración natural, en especial la intensa cosecha de sus semillas. El análisis de patrones espaciales de distribución puede ser una importante herramienta para e...
Article
Full-text available
Jubaea chilensis is an endemic tree of Central Chile (31º15’-35º22’ S). The current main conservation threats for this species should be associated with different factors which limit its natural regeneration, in particular the intense seeds crop. The analysis of spatial distribution patterns can be an important tool to understand the forest dynamic...
Article
Full-text available
Jubaea chilensis is an endemic tree of Central Chile (31º15’- 35º22’ S). The current main conservation threats for this species should be associated with different factors which limit its natural regeneration, in particular the intense seeds crop. The analysis of spatial distribution patterns can be an important tool to understand the forest dynami...
Article
Full-text available
Cultivated land has increased in Chile as a result of a process in which native woodland sites were converted to agricultural production. This process had an intermediate step in which sclerophyll species were replaced by Acacia caven, prior to cattle grazing. This land use change presents environmental impacts resulting from carbon losses of ecosy...
Article
Full-text available
Forest biomass is one of the main alternatives that Chile could promote to supply the long-term demand of energy, which can help to diversify the national energy offer. In this study we assessed the biomass availability from native forests, considering biomass extraction based on silvicultural management and environmental and legal restrictions in...
Article
Full-text available
Keywords: Deforestation Timber plantation Chilean temperate forest Land use e land cover change a b s t r a c t Temperate forest represents the smallest area among the main world's forest biomes, but is one of those most threatened by forest loss. Chile contains most of the temperate forest in South America and more than half of the temperate fores...
Article
Full-text available
Loss of native forest is a key conservation concern globally, for reasons of biodiversity, climate change and ecosystem services. Landscape measures are used widely to characterize forest loss and associated landscape structure, but often without regard for structure imposed by the data used, and associated assumptions. Notably, forest loss is ofte...
Article
Full-text available
The Juan Fernandez Archipelago World Biosphere Reserve (33º S) contains the highest density of insular floral endemism in the world. Currently three invasive woody plant species threaten the conservation of the vegetation of Juan Fernández, particularly on Robinson Crusoe Island. The introduced plant species, Aristotelia chilensis (maqui), Rubus ulm...
Article
Full-text available
The Juan Fernandez Archipelago World Biosphere Reserve (33° S) contains the highest density of insular floral endemism in the world. Currently three invasive woody plant species threaten the conservation of the vegetation of Juan Fernández, particularly on Robinson Crusoe Island. The introduced plant species, Aristotelia chilensis (maqui), Rubus ul...
Chapter
Full-text available
Se estableció un ensayo a largo plazo para determinar el potencial totalmente expresado de la capacidad de recuperación del bosque esclerófilo. Se evaluaron: 1) los efectos de la exclusión de herbívoros en áreas con Acacia caven cercanas a bosque esclerófilo; y 2) las condiciones que pueden aumentar el éxito de medidas de restauración pasiva. Dur...
Article
Full-text available
Natural regeneration of mediterranean plant communities has proved difficult in all continents. In this paper we assess whether regeneration of sclerophyllous forests shows nucleated patterns indicative of a positive effect of vegetation remnants at the landscape level and compare the regeneration patterns between sites with distinctive climate con...
Article
Full-text available
Los índices o métricas de paisaje han sido ampliamente utilizados para relacionar patrones espaciales con procesos o funciones ecológicas. Si bien, su utilización y aplicaciones son amplias, se ha encontrado que los índices de paisaje son muy sensibles a algunos aspectos relacionados con el análisis de imágenes de sensores remotos. El objetivo de e...

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Projects

Projects (9)
Project
The large-scale tree browning and mortality event in the sclerophyllous forest system of Chile offers an exceptional opportunity to improve our local and global understanding of the phenomenology and drivers of regional ecosystem change and its impacts – knowledge that might be crucial to anticipate abrupt collapses that are likely to occur under ongoing climate change (megadrought). This research initiative aims to evaluate the socio-ecological thresholds and ecological transition of the Mediterranean forest of Central Chile under global change impact. The specific objectives are: (1) Analyze the spatio-temporal dynamics of the mega-drought impact on the sclerophyllous forest to identify potential ecosystem transition thresholds. (2) Estimate the impacts of changes in the sclerophyllous forest on the well-being of local communities. (3) Estimate the societal responses to socio-ecological scenarios under climate change.
Project
The aim of this project is to provide a quantitative understanding of the impact of beaver activity (e.g. dam and channels construction) on the capacity of peatlands to accumulate and release carbon into the atmosphere in Patagonia.
Project
Desarrollar un sistema de toma de decisiones para el diseño y planificación de paisajes resistentes a incendios forestales, basado en técnicas de Inteligencia Artificial ANID FONDEF Project ID20i10137