As one of the main driving forces for the change in surface energy balance, land use and cover change affects the ecological climate through different levels of biogeochemical and physical processes. However, many studies on the surface energy balance are conducted from the perspective of biogeochemistry, ignoring biogeochemical processes. By using core methods such as the surface energy balance algorithm and Mann–Kendall trend test, we analyzed the surface energy balance mechanism and ecological climate effects of five land use types in the Huang-Huai-Hai Basin in China. The results showed that: (1) the net radiation and latent heat flux in the five land use types increased significantly, and their highest values were located in cropland areas and urban expansion areas, respectively. (2) The influence of net radiation on surface energy absorption was greater than latent heat flux. This relationship was more obvious in land use types that were greatly influenced by human activities. (3) The net surface energy intake in the Huang-Huai-Hai River Basin showed a decreasing trend and decreased with the increase in human influence intensity, indicating that human activities weakened the positive trend in net surface energy intake and increased the warming effect. This study reveals the difference in energy budgets of different land use types under the influence of human activities. It is helpful for understanding how to formulate sustainable land management strategies, and it also provides a theoretical basis for judging the climate change trends and urban heat island effects in the Huang-Huai-Hai River Basin from a biogeophysical perspective.

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Exploring the Ecological Climate Effects Based on Five Land Use Types: A Case Study of the Huang-Huai-Hai River Basin in China

Few phytoremediation studies have been conducted under semi-arid conditions where plants are subjected to drought and/or salinity stress. Although the genus Salix is frequently used in phytoremediation, information regarding its tolerance of drought and salinity is limited. In the present study, Salix acmophylla Boiss. cuttings from three sites (Adom, Darom and Mea She’arim) were tested for tolerance to salinity stress by growing them hydroponically under either control or increasing NaCl concentrations corresponding to electrical conductivities of 3 and 6 dS m−1 in a 42-day greenhouse trial. Gas exchange parameters, chlorophyll fluorescence and concentration, and water-use efficiency were measured weekly and biomass was collected at the end of the trial. Root, leaf and stem productivity was significantly reduced in the Adom ecotype, suggesting that Darom and Mea She’arim are the more salt-tolerant of the three ecotypes. Net assimilation and stomatal conductance rates in salt-treated Adom were significantly reduced by the last week of the trial, coinciding with reduced intrinsic water use efficiency and chlorophyll a content and greater stomatal aperture. In contrast, early reductions in stomatal conductance and stomatal aperture in Darom and Mea She’arim stabilized, together with pigment concentrations, especially carotenoids. These results suggest that Darom and Mea She’arim are more tolerant to salt than Adom, and provide further phenotypic support to the recently published data demonstrating their genetic similarities and their usefulness in phytoremediation under saline conditions.

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The Physiological Response of Different Brook Willow (Salix acmophylla Boiss.) Ecotypes to Salinity

Investigating the influence of future landuse and climate change on hydrological regime of a humid tropical river basin

En este articulo se reflexiona en torno a la comunicacion, la cultura y el liderazgo para el teletrabajo Esta forma laboral apunta a la flexibilizacion organizacional,aporta al desarrollo personal, familiar y profesional de los colaboradores e impacta positivamente en el medioambiente y la movilidad en las ciudades  El texto surge a partir del desarrollo del proyecto de investigacion: “Propuesta para el fortalecimiento de la cultura organizacional de las Pymes del sector servicios en Antioquia, hacia la consolidacion de experiencias de teletrabajo socialmente responsables”, del grupo de investigacion Gestion de la Comunicacion de la Universidad Pontificia Bolivariana de Medellin DOI:  https://doiorg/1033571/revistaluciernagav9n18a5

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Comunicación organizacional en torno al teletrabajo

Frente a la creciente interrelacion entre espacios –rural-urbano, urbano-urbano y rural-rural– que cambia por completo la perspectiva socioterritorial, en este trabajo se analiza el cambio de las tendencias productivas de una localidad con un fuerte arraigo agricola, que en las ultimas decadas ha transitado del predominio de la actividad agropecuaria hacia una mayor diversificacion, la cual incorpora, de manera creciente, actividades de tipo urbano. Con ello se pretende investigar las recientes formas de vinculacion ruralurbana que van tejiendo nuevas redes de interaccion laboral en localidades de distinto tamano, en un contexto de urbanizacion predominante en el pais y, particularmente, en su region central.

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Movilidad y transición productiva en el contexto de la nueva ruralidad: el caso de Santa Bárbara, Estado de México

Impacts of land management and climate change in a developing and socioenvironmental challenging transboundary region.

En este articulo se documenta, utilizando el caso de un ejido del Valle de Toluca, la transformacion de las actividades laborales, la movilidad geografica y las relaciones campo-ciudad. El periodo de analisis, 1940-2000, abarca la transicion de los procesos de trabajo hacia una etapa posproductivista del campo, de las formas urbanas dominantes y la movilidad espacial. En el estudio se utilizaron entrevistas e historias de vida. Los resultados mostraron la transformacion del trabajo, vinculado en una primera fase con la produccion campesina agricola, hacia ocupaciones dentro del terciario y la industria. Ademas, se observo una salida del trabajo del espacio local al hinterland regional, y el predominio del commuting como forma de movilidad. Finalmente, se presento la transformacion de las relaciones campo-ciudad, con el rompimiento de la relacion de la poblacion rural con la ciudad de Mexico y el surgimiento de vinculos con ciudades de menor tamano y a menor distancia.

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La transformación del trabajo, la movilidad geográfica y las relaciones campo-ciudad en una zona rural del Estado de México

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Adriana Helia Larralde-Corona

Papers

Impacts of land management and climate change in a developing and socioenvironmental challenging transboundary region.

La transformación del trabajo, la movilidad geográfica y las relaciones campo-ciudad en una zona rural del Estado de México

De procesos metropolitanos y ciudades sustentables