{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,13]],"date-time":"2026-01-13T16:16:05Z","timestamp":1768320965808,"version":"3.49.0"},"reference-count":99,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2022,3,31]],"date-time":"2022-03-31T00:00:00Z","timestamp":1648684800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"European Union\u2019s Horizon 2020 research and innovation programme, DIABOLO project \u201cDistributed, inte-grated and harmonized forest information for bioeconomy outlooks\u201d","award":["EU Grant Agreement no. 633464"],"award-info":[{"award-number":["EU Grant Agreement no. 633464"]}]},{"name":"EXTREME project \u201cInfluence of VOCs (volatile organic compounds) on the extreme behavior of forest fires&quot;","award":["Foundation for Science and Technology (PCIF\/GFC\/0078\/2018)"],"award-info":[{"award-number":["Foundation for Science and Technology (PCIF\/GFC\/0078\/2018)"]}]},{"name":"National Institute of Agricultural Research of Spain (INIA)","award":["FEDER - RTA2017-00042-C05-02"],"award-info":[{"award-number":["FEDER - RTA2017-00042-C05-02"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Forests"],"abstract":"<jats:p>Bulk density for shrubs and tree crowns is an important variable, useful for many purposes, namely estimations for biomass and carbon sequestration and potential fire behavior prediction. In the latter case, bulk density is required to predict the rate of spread and intensity of crown fires. However, bulk density information is scarce. The estimation of bulk density is crucial to help choosing proper pyrosilviculture options to decrease fire susceptibility. Due to the similar environmental conditions and fuel characteristics in Portugal and Spain, we modelled bulk density for the most common woody species in all the Iberian Peninsula. We used 10 different shrub type formations and a set of tree species or groups common to both countries. Equations for bulk density, in both forest canopy and understory layers, were fitted as a function of biometric variables commonly used in forest inventories for the selected species. Standardized estimates of bulk density can be associated with data from the National Forest Inventories from Portugal and Spain, to estimate biomass of the forest ecosystems and to evaluate potential fire behavior involving tree canopies and shrubs.<\/jats:p>","DOI":"10.3390\/f13040555","type":"journal-article","created":{"date-parts":[[2022,3,31]],"date-time":"2022-03-31T21:33:03Z","timestamp":1648762383000},"page":"555","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Bulk Density of Shrub Types and Tree Crowns to Use with Forest Inventories in the Iberian Peninsula"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2617-0468","authenticated-orcid":false,"given":"Le\u00f3nia","family":"Nunes","sequence":"first","affiliation":[{"name":"Centre for Applied Ecology \u201cProfessor Baeta Neves\u201d (CEABN), InBIO, School of Agriculture, University of Lisbon, Tapada da Ajuda, 1349-017 Lisbon, Portugal"},{"name":"Department of Physics, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal"}]},{"given":"Mar\u00eda","family":"Pasalodos-Tato","sequence":"additional","affiliation":[{"name":"Subdirecci\u00f3n General de Pol\u00edtica Forestal y Lucha Contra la Desertificaci\u00f3n, Ministerio para la Transici\u00f3n Ecol\u00f3gica y el Reto Demogr\u00e1fico, 28071 Madrid, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1338-8465","authenticated-orcid":false,"given":"Iciar","family":"Alberdi","sequence":"additional","affiliation":[{"name":"INIA, CSIC, Departamento Selvicultura y Gesti\u00f3n de Sistemas Forestales, Ctra. La Coru\u00f1a, Km. 7.5, 28040 Madrid, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5269-0643","authenticated-orcid":false,"given":"Ana Catarina","family":"Sequeira","sequence":"additional","affiliation":[{"name":"Centre for Applied Ecology \u201cProfessor Baeta Neves\u201d (CEABN), InBIO, School of Agriculture, University of Lisbon, Tapada da Ajuda, 1349-017 Lisbon, Portugal"}]},{"given":"Jos\u00e9 Antonio","family":"Vega","sequence":"additional","affiliation":[{"name":"Centro de Investigaci\u00f3n Forestal de Louriz\u00e1n, Estrada Pontevedra-Mar\u00edn, Km. 4, 36153 Pontevedra, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2729-1824","authenticated-orcid":false,"given":"Vasco","family":"Silva","sequence":"additional","affiliation":[{"name":"Centre for Applied Ecology \u201cProfessor Baeta Neves\u201d (CEABN), InBIO, School of Agriculture, University of Lisbon, Tapada da Ajuda, 1349-017 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3823-1184","authenticated-orcid":false,"given":"Pedro","family":"Vieira","sequence":"additional","affiliation":[{"name":"Department of Physics, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal"}]},{"given":"Francisco Castro","family":"Rego","sequence":"additional","affiliation":[{"name":"Centre for Applied Ecology \u201cProfessor Baeta Neves\u201d (CEABN), InBIO, School of Agriculture, University of Lisbon, Tapada da Ajuda, 1349-017 Lisbon, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2022,3,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"265","DOI":"10.1007\/s10342-018-1110-7","article-title":"Mean species cover: A harmonized indicator of shrub cover for forest inventories","volume":"137","author":"Alberdi","year":"2018","journal-title":"Eur. 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