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SEASONAL VARIATION IN LEAF LITTER NUTRIENT CONCENTRATIONS OF VALDIVIAN RAINFOREST TREES Gayana Botánica
Lusk,Christopher H.; Matus,Francisco; Moreno-Chacón,María; Saldaña,Alfredo; Jiménez-Castillo,Mylthon.
Resorption of nutrients from senescing tissues is an important aspect of the nutrient economy of perennial plants, and a major influence on ecosystem nutrient dynamics. Attempts to interpret the adaptive significance of variation in nutrient resorption efficiency have met with little success, leading some scientists to emphasize the need for more work on the biochemical and physiological basis of resorption. One hypothesis suggests than variation in resorption is controlled by sink-source effects within the plant. According to this hypothesis, we might expect resorption to be positively correlated with plant growth rates. This could be expected not only for comparisons among species or populations, but also when comparing conspecific individuals growing at...
Tipo: Journal article Palavras-chave: Nitrogen; Nutrient cycling; Phosphorus; Plant nutrition; Resorption.
Ano: 2003 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100006
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GRAZING MANAGEMENT, AMMONIA AND NITROUS OXIDE EMISSIONS: A GENERAL VIEW R.C. Suelo Nutr. Veg.
Núñez,Pedro; Demanet,Rolando; Matus,Francisco; Mora,Maria de la Luz.
The grazing management of grassland has a direct effect on nitrogen (N) recycling. This is an important reason why management has become an alternative to improve the grassland production and quality, in turn to make it more suitable for the environment. However, the livestock system intensification induces changes in the natural dynamics of the N cycle, accelerating gas emmisions (e.g. ammonia, NH3 and nitrous oxide, N(2)0) and leaching losses from soil under grazing. When the amount of N in the environment increases, there is an impact on smog episodes, global warming, stratospheric ozone depletion, acid rain and eutrophication of fresh water. There are different techniques to evaluate the gases emitted from the soil. This klonowledge is useful to design...
Tipo: Journal article Palavras-chave: Ammonia; Grazing; Management; Nitrogen; Nitrous oxide; Livestock.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000300006
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CARACTERIZACIÓN Y ZONIFICACIÓN EDÁFICA Y CLIMÁTICA DE LA REGIÓN DE COQUIMBO, CHILE R.C. Suelo Nutr. Veg.
Morales S,Luis; Canessa M,Fabricio; Mattar,Cristian; Orrego,Raúl; Matus,Francisco.
Este estudio consistió en la evaluación y clasificación de los recursos climáticos y edáficos en la región de Coquimbo, usando algoritmos topoclimáticos e imágenes de satélite integrados en un ambiente SIG. Se usaron 78 estaciones climáticas con mediciones de precipitación media anual y mensual, temperatura media anual y mensual, humedad relativa y radiación solar. Se utilizó también cartografía de isolineas y un modelo digital de elevaciones escala 1:250.000. Para determinar la distribución espacial de las variables climáticas se probaron regresiones múltiples entre variables topográficas y datos climáticos. Este proceso condujo a la elaboración de matrices con las variables climáticas espacializadas en una escala 1:250.000. Mediante este procedimiento se...
Tipo: Journal article Palavras-chave: Clasificación edafoclimática; Topoclimatología; Regresión multivariada; Análisis Cluster.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912006000300005
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FOREWORD: Second International Symposium of Soil, Ecology and Environment November 8-9,2007 R.C. Suelo Nutr. Veg.
Mora,María de La Luz; Matus,Francisco.
Tipo: Journal article
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000200001
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Land use impacts on physical-based soil organic matter fractions on three hillside Ferrasols in Mexico Chilean J. Agric. Res.
Matus,Francisco; Hidalgo,Claudia; Monreal,Carlos; Estrada,Isabel; Fuentes,Mariela; Etchevers,Jorge.
The effects of cultivation in hillside (> 30% slope) on soil C and N stocks after forest clearance and subsequent cultivation in new re-growth forest sites not always induce rapid soil organic matter (SOM) loss in subtropical areas. In the present study we evaluated the sensitivity to SOM changes of material floatable in water (Fw), coarse sand (> 250 mm), fine sand (50-250 mm), silt (2-50 mm) and clay (0-2 mm) fractions by the impact of cultivation of Mexican Ferrasols. This research also determined the relative degree of C and N saturation in the silt and clay size particles. The soil physical fractions were obtained after ultrasonic vibration and sedimentation. Soil organic matter stock (0-20 cm depth) in cultivated sites ranged from 54 to 146 Mg...
Tipo: Journal article Palavras-chave: Soil C and N; Sand-size; SOM saturation; Ultrasonic dispersion.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200014
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