Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : Producción de hojarasca y retorno potencial de nutrientes en tres sitios del estado de Nuevo León, México

Auteur : López Hernández, Juan Manuel

Université de soutenance : Universidad Autónoma de Nuevo León

Grade : Doctor en Ciencias con especialidad en Manejo de Recursos Naturales UANL, 2014.

Résumé
The objective of this research was to know during two years variables related to litterfall, deposition of nutrients and nutrient use efficiency in three research sites of the state of Nuevo Leon (Los Ramones, China and Linares), which represents the Tamaulipan thornscrub plant community, northeastern Mexico. The quantities of produced litterfall and its constituents differed between 2009 and 2010, being the second studied year where higher litterfall and nutrients occur. Mean litterfall production during the two years showed the following trend : Los Ramones (364.8), China (522.7) and Linares (583.1 g m-2 year-1). For the leaf component, mean deposition ranged from 200.9 (Los Ramones) to 409.8 g m-2 year-1 (Linares), twigs from 62.4 (Los Ramones) to 89.3 (Linares), reproductive structures from 62.5 (Linares) to 80.3 (Los Ramones) and the miscellaneous component, constituted by unidentified plan material, body and insect feces, ranged from 21.1 (Linares) to 32.7 (China). For the two studied years, mean annual deposition of Ca+K+Mg+P+N for Los Ramones, Chin and Linares was 10.1, 21.5 and 24.8 g m-2 year-1, respectively. Regardless of research site, the order of macro and micromineral deposition was as follows : Ca>N>K>Mg>P and Fe>Mn>Zn>Cu. Eventhough phosphorous did not showed statistical differences among sites, the order of nutrient use efficiency showed the following trend : P>Mg>K>N>Ca. There were spatial and temporal variations in litterfall deposition in terms of quantity, quality and potential nutrient returns.

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