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Elemental content in Grassland of semiarid zones: Effect of topographic position and botanical composition

AuthorsVázquez de Aldana, Beatriz R. ; García Ciudad, Antonia ; Pérez Corona, M. Esther ; García Criado, Balbino
Issue Date1993
PublisherTaylor & Francis
CitationCommunications in Soil Science and Plant Analysis 24(15-16): 1975-1989 (1993)
AbstractElemental composition (N, P, K, Ca, Mg, Na, Mn, Fe, Cu, and Zn) was studied in semi‐natural grassland communities of the province of Salamanca (Central‐Western Spain) under the effect of a topographical gradient (two differentiated slope positions: upper zone and lower zone) and for the main botanical groups forming these communities (grasses, legumes, and other families). In the upper positions where the proportion in weight of legumes and other families is greater than in the lower ones, the P, Ca, Fe, and Cu concentrations were higher than in the lower. For elements like N, Mg, and Zn, the zonal difference in the grass was not significant, since this was counteracted by the greater nutrient content of the lower zones and a dilution effect due to the greater production of biomass in that zone. The mean value of the K:(Ca+Mg) ratio in the grass was significantly lower (P<0.05) in the upper zone than in the lower one, and all the samples were lower than the critical value for livestock [2.2]. The highest Ca:P ratio values were also found in the lower zone, with the legumes showing the highest values. Considering the upper and lower zones together, the number of significant correlations between the bioelements was higher for the gramineae group; N, K, and Mg being the elements forming the most correlations within that family. The correlation between Ca and Mg concentrations is noteworthy, appearing in all the cases under consideration. Differentiation by zones gave a lower number of significant correlations than when the upper and lower zones were considered together.
Description15 páginas, 1 figura, 3 tablas. -- Con la colaboración técnica de: L. García, J.C. Estevez, M. Hernández y E. Rodríguez.- This is an electronic version of an article published in Communications in Soil Science and Plant Analysis © 1993 Copyright Taylor & Francis; Communications in Soil Science and Plant Analysis is available online at: http://www.tandfonline.com/doi/abs/10.1080/00103629309368931
Publisher version (URL)http://dx.doi.org/10.1080/00103629309368931
Appears in Collections:(IRNASA) Artículos
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