Hydrological and topographic determinants of biomass and species richness in a Mediterranean-climate shrubland.

<h4>Background</h4>In arid and semiarid shrublands, water availability directly influences ecosystem properties. However, few empirical tests have determined the association between particular soil and hydrology traits with biodiversity and ecosystem biomass at the local scale.<h4>...

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Autores principales:	Samantha Díaz de León-Guerrero, Rodrigo Méndez-Alonzo, Stephen H Bullock, Enrique R Vivoni
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b979012fee6442148615689c737bc5c5
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spelling	oai:doaj.org-article:b979012fee6442148615689c737bc5c52021-11-25T06:23:42ZHydrological and topographic determinants of biomass and species richness in a Mediterranean-climate shrubland.1932-620310.1371/journal.pone.0252154https://doaj.org/article/b979012fee6442148615689c737bc5c52021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0252154https://doaj.org/toc/1932-6203<h4>Background</h4>In arid and semiarid shrublands, water availability directly influences ecosystem properties. However, few empirical tests have determined the association between particular soil and hydrology traits with biodiversity and ecosystem biomass at the local scale.<h4>Methods</h4>We tested if plant species richness (S) and aboveground biomass (AGB) were associated with soil and topographic properties on 36 plots (ca. 12.5 m2) in 17 hectares of chaparral in the Mediterranean-climate of Valle de Guadalupe, Baja California, México. We used close-to-the-ground aerial photography to quantify sky-view cover per species, including all growth forms. We derived an elevation model (5 cm) from other aerial imagery. We estimated six soil properties (soil water potential, organic matter content, water content, pH, total dissolved solids concentration, and texture) and four landscape metrics (slope, aspect, elevation, and topographic index) for the 36 plots. We quantified the biomass of stems, leaves, and reproductive structures, per species.<h4>Results</h4>86% of AGB was in stems, while non-woody species represented 0.7% of AGB but comprised 38% of S (29 species). Aboveground biomass and species richness were unrelated across the landscape. S was correlated with aspect and elevation (R = 0.53, aspect P = 0.035, elevation P = 0.05), while AGB (0.006-9.17 Kg m-2) increased with soil water potential and clay content (R = 0.51, P = 0.02, and P = 0.04). Only three species (11% of total S) occupied 65% of the total plant cover, and the remaining 26 represented only 35%. Cover was negatively correlated with S (R = -0.38, P = 0.02). 75% of AGB was concentrated in 30% of the 36 plots, and 96% of AGB corresponded to only 20% of 29 species.<h4>Discussion</h4>At the scale of small plots in our studied Mediterranean-climate shrubland in Baja California, AGB was most affected by soil water storage. AGB and cover were dominated by a few species, and only cover was negatively related to S. S was comprised mostly by uncommon species and tended to increase as plant cover decreased.Samantha Díaz de León-GuerreroRodrigo Méndez-AlonzoStephen H BullockEnrique R VivoniPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 5, p e0252154 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Samantha Díaz de León-Guerrero Rodrigo Méndez-Alonzo Stephen H Bullock Enrique R Vivoni Hydrological and topographic determinants of biomass and species richness in a Mediterranean-climate shrubland.
description	<h4>Background</h4>In arid and semiarid shrublands, water availability directly influences ecosystem properties. However, few empirical tests have determined the association between particular soil and hydrology traits with biodiversity and ecosystem biomass at the local scale.<h4>Methods</h4>We tested if plant species richness (S) and aboveground biomass (AGB) were associated with soil and topographic properties on 36 plots (ca. 12.5 m2) in 17 hectares of chaparral in the Mediterranean-climate of Valle de Guadalupe, Baja California, México. We used close-to-the-ground aerial photography to quantify sky-view cover per species, including all growth forms. We derived an elevation model (5 cm) from other aerial imagery. We estimated six soil properties (soil water potential, organic matter content, water content, pH, total dissolved solids concentration, and texture) and four landscape metrics (slope, aspect, elevation, and topographic index) for the 36 plots. We quantified the biomass of stems, leaves, and reproductive structures, per species.<h4>Results</h4>86% of AGB was in stems, while non-woody species represented 0.7% of AGB but comprised 38% of S (29 species). Aboveground biomass and species richness were unrelated across the landscape. S was correlated with aspect and elevation (R = 0.53, aspect P = 0.035, elevation P = 0.05), while AGB (0.006-9.17 Kg m-2) increased with soil water potential and clay content (R = 0.51, P = 0.02, and P = 0.04). Only three species (11% of total S) occupied 65% of the total plant cover, and the remaining 26 represented only 35%. Cover was negatively correlated with S (R = -0.38, P = 0.02). 75% of AGB was concentrated in 30% of the 36 plots, and 96% of AGB corresponded to only 20% of 29 species.<h4>Discussion</h4>At the scale of small plots in our studied Mediterranean-climate shrubland in Baja California, AGB was most affected by soil water storage. AGB and cover were dominated by a few species, and only cover was negatively related to S. S was comprised mostly by uncommon species and tended to increase as plant cover decreased.
format	article
author	Samantha Díaz de León-Guerrero Rodrigo Méndez-Alonzo Stephen H Bullock Enrique R Vivoni
author_facet	Samantha Díaz de León-Guerrero Rodrigo Méndez-Alonzo Stephen H Bullock Enrique R Vivoni
author_sort	Samantha Díaz de León-Guerrero
title	Hydrological and topographic determinants of biomass and species richness in a Mediterranean-climate shrubland.
title_short	Hydrological and topographic determinants of biomass and species richness in a Mediterranean-climate shrubland.
title_full	Hydrological and topographic determinants of biomass and species richness in a Mediterranean-climate shrubland.
title_fullStr	Hydrological and topographic determinants of biomass and species richness in a Mediterranean-climate shrubland.
title_full_unstemmed	Hydrological and topographic determinants of biomass and species richness in a Mediterranean-climate shrubland.
title_sort	hydrological and topographic determinants of biomass and species richness in a mediterranean-climate shrubland.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/b979012fee6442148615689c737bc5c5
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Hydrological and topographic determinants of biomass and species richness in a Mediterranean-climate shrubland.

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