Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

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Cette carte comporte les caractéristiques hydrogéologiques du Bassin Río de las Avenidas de Pachuca, Hidalgo, oú l´on observe que dans cette zone le contexte géologique determine l´existence de trois unites aquiféres qu´ont des connexions hydrauliques et composent un systeme aquifére. Ce systeme constitue une zone de recharge, ou les sorties sont seulement artificielles et supérieures a la recharge, comme le montre le bilan hydraulique obtenu dans cet étude et comme le montre également l´analyse piézométrique pour une période de 20 ans, qui révélé que le niveau de l´eau baisse un metre par ans, par suite de l´exploitation. De meme depuis le Cerro Cubitos, l´analyse piézométrique met en evidence un flux régional du nord vers le sud. D´une facon générale l´eau souterraine de ce bassin est de qualité suffisante pour tous les besoins, mais dans les zones de Téllez y Tizayuca, on s´apercoit qu´il a des indices de pollution de type organique et inorganique.

The importation of raw material for the oleaginous industry, assures the supply of seeds and raw oils to this sector where Mexico does not have enough production of them. Thanks to this, Mexico is in an eminently good position to participate successfully in the North American and Canadian markets throught the Free Trade Treaty (TLC Tratado de Libre Comercio). There exists a great complementary fact among the three countries involved in the TLC, since the United States and Canada produce a great surplus of oleaginous seeds, and Mexico has the enough capability to carry out the processes of grinding and refining them. A necessary condition to be able to achieve an effective penetration, consists in having access to the North American markets with no customs tariffs, and also to the inputs with the same conditions that the counterparts in the treaty The United States and Canada have. In the Mexican Republic, the oleaginous industry has four regional centers. They are: a) The Federal District (D.F.), and the state of Mexico based in the nearness of the oil market, where private enterprises operate with processing plants and their particular delivery system, b) The Occidental sector with its gravitational center in the city of Guadalajara and its area of influence, where the paste market is of great importance, c) In the nort­heastern section of Mexico in the state of Nuevo León mainly which is the gravitational center of this activity, and the north of Tamaulipas, where they get the raw material from abroad, d) The northwestern sector formed by the states of Sonora, Sinaloa and Baja California. This region produ­ces oleaginous seeds and the tendency to process the seeds locally can be observed as one of the ways to increase the regional level of development when incorporating the advantages that the financial organizations of sup­port offer to the agricultural industries, and also other political instruments like the TLC offer them advantages to encourage investment in the basic product fields. It is hoped that the TLC bring investments for the oleaginous inustry, at the time when the external market be increased and when the supply of raw material can be assured, this will permit increase the coefficient of workability as well as the installed capacity.

The National System for the Protection of Natural Areas (SINAP) is part of the National Institute of Ecology, former branch of the Ministry of Ecology and Urban Development (SEDUE), today Ministry of Social Development (SEDESOL). The SINAP was founded in 1984 and among its responsabilities was the ruling of institutions through the General Law of Ecological Equilibrium and Environmental Protection. In order to support the SINAP, this study evaluates the natural conditions of areas already protected and those of other areas that according to (heir values and the scientific opinion can be considered as such. This proposal contributes to the conservation of significative natural features at a national scale (biodiversity, endemisms, scenic landscape, landforms, etc.). The proposal includes 258 areas instead of the 99 considered until now. These areas represent the main diversity of ecosystems along the country.

This paper presents an analysis of the time series of yearly mean temperatures and yearly precipitation during 1923–1988 for Veracruz (19º 12´ N, 96º 8´ W, 16 masl), Xalapa (19º 32´ N, 96º 55´ W, 1 420 masl) and Las Vigas (19º 38´ N, 97º 5´ W, 2 421 masl). In order to weigh in preliminary form the impact of the increase of atmospheric CO2 concentrations, the presence of El Niño or Southern Oscilation (ENSO), the tropical atmospheric disturbances in the Pacific and the Atlantic Oceans, and the urbanization on both the rainfal and the temperature, we use statistical techniques as smoothing series, box plots, simple correlation and canonical correlation analysis. The conclusions carry out conjetures for future research.