![]() ![]() Estos tipos de propiedad tienen un gran potencial económico y ecológico sin embargo, la mayoría tiene grandes carencias que dificultan la producción agropecuaria y forestal. ![]() Los ejidos y comunidades agrarias son la forma de tenencia de la tierra que abarca mayor superficie en el campo mexicano ellos ofertan una importante producción agropecuaria y en sus suelos están la mayor parte de los montes, áreas forestales, manglares, costas, agua, minas y diversos atractivos naturales sin embargo, poco se conocen sus características generales, por lo que este artículo presenta los rasgos principales de estas formas de propiedad del suelo y un panorama amplio de su situación actual (basado fundamentalmente en el análisis del último censo ejidal). Key words: comunero ejidatario agrarian nucleus social property Government policies (economic and social) should be directed fundamentally towards these, since they have a huge capacity for production and for generating environmental services, although what is lacking for their development is state support. Also, they are not homogeneous because they present considerable disparities in their allotment of resources, to the degree that only one fourth of them have adequate productive conditions, with ejidos and communities being the main form of land tenure in México likewise, they house the largest part of the rural population. These types of property have a great economic and ecological potential however, most of them have many shortages that make agricultural/livestock and forestry production difficult. However, little is known about their general characteristics, so this article presents the main features of these forms of land tenure and a broad outlook of their current situation (based fundamentally on the analysis of the last ejido census). The authors conclude that this oscillation in differential rotation of the inner core, coinciding with periodic changes in the Earth’s surface system, demonstrates the interaction between different layers of the Earth.The ejidos and agrarian communities are the form of land tenure that covers most of the surface in the Mexican countryside these offer important agricultural and livestock production and most of the hills, forest areas, mangroves, coasts, water, mines and various natural attractions are in their lands. The authors indicate that this variation correlates with changes in geophysical observations at the Earth’s surface, such as the magnetic field and the length of day. ![]() They also identified that this may be associated with an overall slowing down of the inner core rotation as part of a seven-decade oscillation with a previous turning point occurring in the early 1970s. They found that since around 2009, paths that previously showed significant temporal variation have exhibited little change, suggesting that this differential inner core rotation has paused. Yi Yang and Xiaodong Song analysed the difference in the waveform and travel time of seismic waves from near-identical earthquakes that have passed through the Earth’s inner core along similar paths since the 1960s. ![]() However, the speed of this rotation, and whether it varies, is debated. Knowing how the inner core rotates could illuminate how these layers interact. The spin of the inner core is driven by the magnetic field generated in the outer core and balanced by the gravitational effects of the mantle. The Earth’s inner core is separated from the rest of the solid Earth by the liquid outer core, enabling it to rotate differently from the rotation of the Earth itself. These findings indicate that changes in this differential rotation could occur on a decadal scale and could aid our understanding of how processes deep in the Earth affect its surface. The rotation of the Earth’s solid inner core relative to its mantle may have recently slowed down and could be rotating more slowly than the mantle, according to a study published in Nature Geoscience this week. Please note the press release below has been updated. ![]()
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