Abstract
• Key messageThis document provides valuable environmental information about a triplets’ essay of Scots pine and Maritime pine in Spain. The dataset characterizes the soil profile (physicochemical parameters of organic and mineral horizons), climate, physiography, understory and overstory. Dataset access is athttps://doi.org/10.5281/zenodo.4384530and associated metadata is available athttps://metadata-afs.nancy.inra.fr/geonetwork/srv/fre/catalog.search#/metadata/21cca830-daf9-4913-9b5b-a185d77943d5
Highlights
Many of the studies that highlight the role of mixed vs monospecific forests to supply ecosystem services are focused on mixtures that combine tree species with contrasting traits (Gamfeldt et al 2013; Carnol et al 2014; Almeida et al 2018)
Chemical parameters analysed for each mineral horizon included exchangeable cations (Ca+2, Mg+2, K+, Na+) extracted with 1 M ammonium acetate at pH = 7 (Schollenberger and Simon 1945) and determined using an atomic absorption/emission spectrometer; cation exchange capacity according to Mehlich (1953); total organic carbon and total nitrogen quantified by dry combustion using a Leco CHN 2000 elemental analyser; oxidizable carbon analysed using the K-dichromate oxidation method (Walkley 1947); available phosphorus using the Olsen method (Olsen and Sommers 1982); and pH and electrical conductivity determined in a soil/water suspension in a ratio of 1:2.5 according to Van-Reeuwijk (2002)
The site index of both Pinus species was calculated with the dominant height of the plot and the related at age 100 for total plot; for Pinus sylvestris according to Rojo and Montero (1996) and for Pinus pinaster according to Bravo-Oviedo et al (2007)
Summary
Many of the studies that highlight the role of mixed vs monospecific forests to supply ecosystem services are focused on mixtures that combine tree species with contrasting traits (Gamfeldt et al 2013; Carnol et al 2014; Almeida et al 2018). María-Belén Turrión: designed the experiment, supervised the laboratory analyses and corrected the manuscript. Felipe Bravo: designed the experiment, coordinated the research project and corrected the manuscript. Carolina Martínez-Ruiz: designed the experiment, supervised the understory analyses and corrected the manuscript. The essay, located in North-Central Spain, consists of eighteen forest plots divided in six triplets. Each triplet includes three circular plots of 15-m radius located less than 1 km from each other: two monospecific plots dominated by P. sylvestris or P. pinaster, and one mixed plot of both species. One pit up to 50 cm depth, one 15-m radius overstory features inventory and ten understory
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