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Hernandez Velasco, MarcoORCID iD iconorcid.org/0000-0001-6805-2112
Publications (10 of 18) Show all publications
Hernandez Velasco, M. & Mattsson, A. (2020). Light shock stress after outdoor sunlight exposure in seedlings of picea abies (L.) Karst. and Pinus sylvestris L. pre-cultivated under LEDs-possible mitigation treatments and their energy consumption. Forests, 11(3), Article ID 354.
Open this publication in new window or tab >>Light shock stress after outdoor sunlight exposure in seedlings of picea abies (L.) Karst. and Pinus sylvestris L. pre-cultivated under LEDs-possible mitigation treatments and their energy consumption
2020 (English)In: Forests, ISSN 1999-4907, E-ISSN 1999-4907, Vol. 11, no 3, article id 354Article in journal (Refereed) Published
Abstract [en]

Year-round cultivation under light emitting diodes (LEDs) has gained interest in boreal forest regions like Fenno-Scandinavia. This concept offers forest nurseries an option to increase seedling production normally restricted by the short vegetation period and the climate conditions. In contrast to some horticultural crops which can be cultivated entirely under LEDs without sunlight, forest seedlings need to be transplanted outdoors in the nursery at a very young age before being outplanted in the field. Juvenile plants are less efficient using absorbed light and dissipating excess energy making them prone to photoinhibition at conditions that usually do not harm mature plants. The outdoor transfer can cause stress in the seedlings due to high sunlight intensity and exposure to ultraviolet (UV) radiation not typically present in the spectra of LED lamps. This study tested possible treatments for mitigating light shock stress in seedlings of Picea abies (L.) Karst. and Pinus sylvestris L. transplanted from indoor cultivation under LEDs to outdoor sunlight exposure. Three sowings were carried out in 2014 (May and June) and 2015 (May) cultivating the seedlings during five weeks under LED lights only. Afterwards, higher light intensity or UV radiation treatments were applied during one week in order to adapt the seedlings to natural outdoor conditions. After transplanting a transition phase was introduced using shading cloths for one or three weeks as outdoor treatments for light shock mitigation. Chlorophyll fluorescence (ChlF) levels and CO2 assimilation rates were measured before transplanting and followed outdoors during 5 weeks. The ChlF results revealed stress symptoms in the photoreceptors during the first days after transplanting. After five weeks outdoors the ChlF levels had recovered and the light saturation points had shifted, allowing higher CO2 assimilation rates. By the end of the vegetation period the morphological attributes showed no major differences between treatments. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

Place, publisher, year, edition, pages
MDPI AG, 2020
Keywords
Forest tree seedlings, Light emitting diodes, Light quality and intensity, Light-shock, Photoinhibition, Year-round production
National Category
Agricultural Science, Forestry and Fisheries
Research subject
Energy and Built Environments
Identifiers
urn:nbn:se:du-32385 (URN)10.3390/f11030354 (DOI)2-s2.0-85082336610 (Scopus ID)
Available from: 2020-04-07 Created: 2020-04-07 Last updated: 2020-04-07
Hernandez Velasco, M. (2020). Treatments for induction of cold hardiness in Picea abies (L.) Karst. and Pinus sylvestris L. seedlings pre-cultivated under light-emitting diodes–impact of photoperiod and temperature including energy consumption and seedling quality after cold storage. Scandinavian Journal of Forest Research
Open this publication in new window or tab >>Treatments for induction of cold hardiness in Picea abies (L.) Karst. and Pinus sylvestris L. seedlings pre-cultivated under light-emitting diodes–impact of photoperiod and temperature including energy consumption and seedling quality after cold storage
2020 (English)In: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891Article in journal (Refereed) In press
Abstract [en]

In Nordic climates, the weather allows a narrow time window during spring and summer for forest seedlings to be transplanted from indoor growth to outdoor conditions. If a new method for year-round cultivation under LED lamps is to be successfully introduced in forest nurseries, a cold storage phase for batches produced outside of the vegetation period needs to be included in the concept. Different short-day treatments for induction of cold hardiness in very young seedlings of Picea abies and Pinus sylvestris cultivated solely under LED lamps were investigated. The study compared a combination of two photoperiods (5 h or 8 h) at three different temperatures (5°C, 10°C or 20°C) applied during five weeks. Chlorophyll fluorescence, shoot electrolyte leakage and molecular testing for gene expression of cold acclimation were used to assess the treatments. After a period of three months in cold storage at 2°C, the vitality of the seedlings was evaluated using a root growth capacity test. Lower temperatures during the treatments, especially for Pinus sylvestris, had a significant effect on inducing cold hardiness. The results showed that the photoperiod should not be overly reduced to allow photosynthesis and generation of carbohydrate reserves but it could be optimized to reduce electricity consumption. © 2020, © 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

Keywords
Cold hardiness, containerized forest seedlings, photoperiod and temperature, seedling cold storage, seedling quality, short-day treatments, year-round cultivation under LED lamps, Cold storage, Electrolytes, Energy utilization, Gene expression, Light emitting diodes, Plants (botany), Seed, LEd lamps, Forestry
National Category
Agricultural Science, Forestry and Fisheries
Research subject
Energy and Built Environments
Identifiers
urn:nbn:se:du-31814 (URN)10.1080/02827581.2020.1718199 (DOI)000511579400001 ()2-s2.0-85078399653 (Scopus ID)
Available from: 2020-02-03 Created: 2020-02-03 Last updated: 2020-03-12Bibliographically approved
Hernandez Velasco, M. & Mattsson, A. (2019). Light quality and intensity of light-emitting diodes during pre-cultivation of Picea abies (L.) Karst. and Pinus sylvestris L. seedlings - impact on growth performance, seedling quality and energy consumption. Scandinavian Journal of Forest Research, 34(3), 159-177
Open this publication in new window or tab >>Light quality and intensity of light-emitting diodes during pre-cultivation of Picea abies (L.) Karst. and Pinus sylvestris L. seedlings - impact on growth performance, seedling quality and energy consumption
2019 (English)In: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 34, no 3, p. 159-177Article in journal (Refereed) Published
Abstract [en]

Three different LED lamps with continuous spectra were compared against commonly used fluorescent lights. The lamps were characterized by light output, energy consumption and spectral quality for plant growth. The biological effects of light quality were compared by pre-cultivating seedlings of Picea abies (L.) Karst. and Pinus sylvestris L. under each spectrum for 35 days in a growth chamber with controlled temperature, humidity and photoperiod. The seedlings were then transplanted and cultivated for one vegetation period at the nursery, then planted outdoors on a forest field trial and followed for three years. The seedlings showed similar growth performance for all spectra tested. LED lamps have several advantages to fluorescent light such as energy consumption, longer life span and adjustable light intensity. Regarding light intensity the effects on growth performance were studied for both species using the most promising LED spectra. The photosynthetically active radiation (PAR) was maintained at 50, 100, 200 and 400 mu mol m(-2) s(-1). Unlike energy consumption, seedling development did not display a linear relationship to light intensity. Instead, the results show an optimum light level between 100 and 200 mu mol m(-2) s(-1) for the shade tolerant Picea abies seedlings and a level of around 200 mu mol m(-2) s(-1) for the more shade intolerant Pinus sylvestris seedlings.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
Cultivation under LED lamps, growth performance and quality of forest seedlings, light quality, light intensity, energy consumption
National Category
Biological Sciences
Research subject
Energy, Forests and Built Environments
Identifiers
urn:nbn:se:du-29621 (URN)10.1080/02827581.2019.1578404 (DOI)000459142200001 ()
Available from: 2019-03-07 Created: 2019-03-07 Last updated: 2019-03-07Bibliographically approved
Hernandez Velasco, M. & Mattsson, A. (2016). Swedish experiences and visions on the production of containerized seedlings. In: Palle Madsen (Ed.), : . Paper presented at Udviklingskonference: Dækrodsplanter; Skovskolen i Nødebo, 9 March 2016.
Open this publication in new window or tab >>Swedish experiences and visions on the production of containerized seedlings
2016 (English)In: / [ed] Palle Madsen, 2016Conference paper, Oral presentation only (Other academic)
National Category
Forest Science
Research subject
Energy, Forests and Built Environments, Zephyr, EU projekt inom 7:e ramprogrammet, europeiskt samverkansprojekt för utveckling av ny energisnål och miljövänlig teknik för produktion av skogsplantor
Identifiers
urn:nbn:se:du-21399 (URN)
Conference
Udviklingskonference: Dækrodsplanter; Skovskolen i Nødebo, 9 March 2016
Funder
EU, FP7, Seventh Framework Programme, 308313
Available from: 2016-05-02 Created: 2016-05-02 Last updated: 2016-05-20Bibliographically approved
Hernandez Velasco, M., Pérez-Mora, N. & Marras, T. (2016). Using Hybrid Solar Photovoltaic + Combined Heat and Power Systems (PV+CHP) to Enable Industrial Scale Indoor Plant Cultivation: a Feasibility Study. In: : . Paper presented at 11th ISES EuroSun Conference, Mallorca, Spain; 14 October 11-14, 2016.
Open this publication in new window or tab >>Using Hybrid Solar Photovoltaic + Combined Heat and Power Systems (PV+CHP) to Enable Industrial Scale Indoor Plant Cultivation: a Feasibility Study
2016 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

A rapid population growth linked to intensive agriculture has originated several problems such as soil degradation, groundwater depletion, forestland transformation, and eutrophication of aquatic systems. Vertical farming offers an alternative for producing plants indoors in a resources and space efficient manner, reducing leakage of chemicals, optimizing water and land use, and allowing year-round cultivation. Controlled environment agriculture (CEA) also enables urban residents to access locally grown plants that would have otherwise been imported from far away, reducing transport and storage emissions. This comes with a caveat: the energy loads increase to provide artificial illumination and keep an optimal climate. To address this issue, the present work studies the feasibility of using a hybrid photovoltaics and combined heat and power system (PV+CHP) to satisfy the energy demands of an industrial-sized growth room. For this, different European locations and climates have been considered as well as various growth protocols.

Keywords
PV+CHP; Solar-powered growth rooms; Controlled-environment agriculture; Vertical farming
National Category
Energy Systems Forest Science
Research subject
Energy, Forests and Built Environments
Identifiers
urn:nbn:se:du-23475 (URN)
Conference
11th ISES EuroSun Conference, Mallorca, Spain; 14 October 11-14, 2016
Available from: 2016-11-25 Created: 2016-11-25 Last updated: 2016-11-28Bibliographically approved
Chiatante, D., Radoglou, K., Sismanis, N., Smirnakou, S., Mattsson, A., Hernandez Velasco, M., . . . Ferreira, R. (2015). ZEPHYR Project – Deliverable D3.3: Final report on growth tests and biological validation.
Open this publication in new window or tab >>ZEPHYR Project – Deliverable D3.3: Final report on growth tests and biological validation
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2015 (English)Report (Other academic)
National Category
Forest Science
Research subject
Energy, Forests and Built Environments, Zephyr, EU projekt inom 7:e ramprogrammet, europeiskt samverkansprojekt för utveckling av ny energisnål och miljövänlig teknik för produktion av skogsplantor
Identifiers
urn:nbn:se:du-21403 (URN)
Projects
Zephyr Project
Funder
EU, FP7, Seventh Framework Programme, 308313
Available from: 2016-05-02 Created: 2016-05-02 Last updated: 2016-05-03Bibliographically approved
Mattsson, A., Hernandez Velasco, M., Rusu, C., Pietrzak, M., Ferreira, R., Radoglou, K., . . . Kotilainen, T. (2015). ZEPHYR Project – Deliverable D7.6: Articles and peer-reviewed papers.
Open this publication in new window or tab >>ZEPHYR Project – Deliverable D7.6: Articles and peer-reviewed papers
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2015 (English)Report (Other (popular science, discussion, etc.))
National Category
Forest Science Energy Systems
Research subject
Energy, Forests and Built Environments, Zephyr, EU projekt inom 7:e ramprogrammet, europeiskt samverkansprojekt för utveckling av ny energisnål och miljövänlig teknik för produktion av skogsplantor
Identifiers
urn:nbn:se:du-21404 (URN)
Projects
Zephyr Project
Funder
EU, FP7, Seventh Framework Programme, 308313
Available from: 2016-05-02 Created: 2016-05-02 Last updated: 2016-11-24Bibliographically approved
Hernandez Velasco, M. & Mattsson, A. (2014). A silvicultural practice to facilitate forest restoration: a new seedling cultivation technology for regeneration establishment. In: John A. Parrotta, Cynthia F. Moser, Amy J. Scherzer, Nancy E. Koerth and Daryl R. Lederle (Ed.), The International Forestry Review Vol.16 (5), 2014: . Paper presented at Sustaining Forests, Sustaining People: The Role of Research. XXIV IUFRO World Congress, 5-11 October 2014, Salt Lake City, USA (pp. 129). The Commonwealth Forestry Association, www.cfa-international.org, 16(5)
Open this publication in new window or tab >>A silvicultural practice to facilitate forest restoration: a new seedling cultivation technology for regeneration establishment
2014 (English)In: The International Forestry Review Vol.16 (5), 2014 / [ed] John A. Parrotta, Cynthia F. Moser, Amy J. Scherzer, Nancy E. Koerth and Daryl R. Lederle, The Commonwealth Forestry Association, www.cfa-international.org , 2014, Vol. 16, no 5, p. 129-Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

Forest restoration has become a primary task, not only to cope with an increasing demand on forest products, but also to fi ghtclimate change and compensate for an accelerated global deforestation. However, many of the current practices used in forestrynurseries to produce forest planting stock have adverse effects on the environment. The main objective of the ZEPHYR project,funded by the European Commission under the Seventh Framework Programme (FP7), is to develop an innovative zero-impacttechnology for the pre-cultivation of forest regeneration materials that is not affected by the outdoor climate. Among the maincomponents to be improved are artifi cial lighting sources used for cultivation. Traditional fl uorescence lamps are to be replacedby LED grow lights with spectra tailored to the seedlings’ needs. The present work investigates biological responses of Piceaabies and Pinus sylvestris to six different light spectra. The pre-cultivation has been done following standard growth protocolsduring 5 weeks with a photoperiod of 16 h at 100 μmol/m2/s. This has been done under controlled closed conditions with a roomtemperature of 20 °C and a relative humidity of 60%. The analyses have shown clear differences among the treatments and theiradapting capacity when transplanted.

Place, publisher, year, edition, pages
The Commonwealth Forestry Association, www.cfa-international.org, 2014
Keywords
Forest restoration, LED grow lights, nursery production, containerized planting stock
National Category
Forest Science
Research subject
Energy, Forests and Built Environments, Zephyr, EU projekt inom 7:e ramprogrammet, europeiskt samverkansprojekt för utveckling av ny energisnål och miljövänlig teknik för produktion av skogsplantor
Identifiers
urn:nbn:se:du-16433 (URN)
Conference
Sustaining Forests, Sustaining People: The Role of Research. XXIV IUFRO World Congress, 5-11 October 2014, Salt Lake City, USA
Funder
EU, FP7, Seventh Framework Programme, 308313
Available from: 2014-11-20 Created: 2014-11-20 Last updated: 2016-05-03Bibliographically approved
Hernandez Velasco, M. & Mattsson, A. (2014). Cultivation of forest regeneration materials under artificial radiant sources—effects of light intensity on energy consumptionand seedling development. In: John A. Parrotta, Cynthia F. Moser, Amy J. Scherzer, Nancy E. Koerth and Daryl R. Lederle (Ed.), The International Forestry Review Vol.16 (5), 2014: . Paper presented at Sustaining Forests, Sustaining People: The Role of Research. XXIV IUFRO World Congress, 5-11 October 2014, Salt Lake City, USA (pp. 300-300). , 16(5)
Open this publication in new window or tab >>Cultivation of forest regeneration materials under artificial radiant sources—effects of light intensity on energy consumptionand seedling development
2014 (English)In: The International Forestry Review Vol.16 (5), 2014 / [ed] John A. Parrotta, Cynthia F. Moser, Amy J. Scherzer, Nancy E. Koerth and Daryl R. Lederle, 2014, Vol. 16, no 5, p. 300-300Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

In times of major environmental challenges and increasing demand for forest products, planted forests have acknowledgedadvantages compared to other land uses. Despite not being able to completely take the place of natural forests, planted ones have,if properly managed, great potential to contribute in addressing these problems. Besides the ecological benefi ts such as carbonsequestration, planted forests can help meet the demand for wood products without further depletion of the natural forest. Forestrestoration, rehabilitation, and reforestation are limited by the capacity for producing forest regeneration materials. Often, asproduction is intensifi ed at forest nurseries, the practices begin to have an adverse impact on the environment and stop being trulysustainable. One of the main issues in nurseries is the energy consumption for grow lights during periods of short daylight.By using high-effi ciency LED grow lamps and adjusting the light intensity, this study aimed to reduce the energy consumptionfrom lighting per seedling without compromising seedling development. The precultivation of Picea abies and Pinus sylvestrisseedlings was done during 5 weeks under controlled conditions at 20 °C and a relative humidity of 60%. The photoperiod was16 hours at an intensity ranging from 50 to 350 μmol/m2/s in intervals of 50 μmol/m2/s intervals.

Keywords
Containerized planting stock production, LED grow lights, Picea abies, Pinus sylvestris, energy consumption
National Category
Forest Science Energy Systems
Research subject
Energy, Forests and Built Environments, Zephyr, EU projekt inom 7:e ramprogrammet, europeiskt samverkansprojekt för utveckling av ny energisnål och miljövänlig teknik för produktion av skogsplantor
Identifiers
urn:nbn:se:du-16434 (URN)
Conference
Sustaining Forests, Sustaining People: The Role of Research. XXIV IUFRO World Congress, 5-11 October 2014, Salt Lake City, USA
Available from: 2014-11-20 Created: 2014-11-20 Last updated: 2016-05-03Bibliographically approved
Hernandez Velasco, M. & Mattsson, A. (2014). Energy efficiency in intensified production of forest regeneration materials – design of a photovoltaic system for sustainably powering an innovative forestry incubator. In: John A. Parrotta, Cynthia F. Moser, Amy J. Scherzer, Nancy E. Koerth and Daryl R. Lederle (Ed.), The International Forestry Review Vol.16 (5), 2014: . Paper presented at Sustaining Forests, Sustaining People: The Role of Research. XXIV IUFRO World Congress, 5-11 October 2014, Salt Lake City, USA (pp. 393-393). , 16(5)
Open this publication in new window or tab >>Energy efficiency in intensified production of forest regeneration materials – design of a photovoltaic system for sustainably powering an innovative forestry incubator
2014 (English)In: The International Forestry Review Vol.16 (5), 2014 / [ed] John A. Parrotta, Cynthia F. Moser, Amy J. Scherzer, Nancy E. Koerth and Daryl R. Lederle, 2014, Vol. 16, no 5, p. 393-393Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

Planted forests can contribute addressing problems of global concern such as climate change mitigation, biodiversity lost and pressure on ecosystems due to high demand of forestry products. However, in order to be able to profit from these benefits sustainably, production rates of forest regeneration materials should be higher than the harvesting rates. Nevertheless, intensive production methods often bring along adverse consequences for the environment. In the frame of the ZEPHYR project, funded by the European Commission under the Seventh Framework Programme (FP7), innovative and cost-friendly technologies for the pre-cultivation are being developed. They will be integrated into a functional and transportable system for a large scale production of seedlings, with zero-impact on the environment and not affected by outdoor conditions. To achieve this, high efficiency devices with low energy consumption will be used and the incubator will be powered by solar energy. This work aims to present the efforts made to reduce the energy loads and optimize the photovoltaic (PV) system. The power system will also be capable of connecting to the electricity grid, using a diesel generator as a back-up, and a battery bank with at least one day of autonomy (up to 7 kWh/day) in central European latitudes.   

Keywords
Planted forest, photovoltaic system, climate change mitigation, incubator, forest regeneration materials
National Category
Forest Science Energy Systems
Research subject
Energy, Forests and Built Environments, Zephyr, EU projekt inom 7:e ramprogrammet, europeiskt samverkansprojekt för utveckling av ny energisnål och miljövänlig teknik för produktion av skogsplantor
Identifiers
urn:nbn:se:du-16436 (URN)
Conference
Sustaining Forests, Sustaining People: The Role of Research. XXIV IUFRO World Congress, 5-11 October 2014, Salt Lake City, USA
Funder
EU, FP7, Seventh Framework Programme, 308313
Available from: 2014-11-20 Created: 2014-11-20 Last updated: 2016-05-03Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-6805-2112

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