Atmospheric and Geologic Constraints on the Biogeochemistry of North and South American Temperate Rainforests

Hedin, Lars O.; Hetherington, Eugene D.

doi:10.1007/978-1-4612-3970-3_4

Cited by 8 publications

(2 citation statements)

References 28 publications

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“…The bedrock of Isla de Chiloé is Precambrian schist (Pé rez et al, 1991;Lopez-Escobar et al, 1995). Low levels of silica in drainage waters indicate that weathering of the bedrock does not play a significant role in the mobilization of nutrients in these mountains (Hedin and Hetherington, 1996). Available P and exchangeable base cations Ca, Mg, and K are strongly related to soil organic matter content (Zarin et al, 1998;Thomas et al, 1999).…”

mentioning

confidence: 99%

Litter Quality and Climate Decouple Nitrogen Mineralization and Productivity in Chilean Temperate Rainforests

Joshi

Vann

Johnson

2006

Soil Science Soc of Amer J

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We measured litter quality, N mineralization, air and soil temperatures, soil moisture, and aboveground net primary production (ANPP) at 18 plots in three forest types typical of full-stature forests found on western slopes of the Cordillera de Piuchué (CP) on Isla de Chiloé in southern Chile. The primary objectives were to examine the range of net N mineralization across forest types that have different vegetation and litter composition, assess probable controls on mineral N production and leaching, and to determine if the relationship between N mineralization and ANPP was similar to that observed in cool temperate northern hemisphere forests. Average annual litter lignin/N ratios were high in the evergreen montane broadleaf forest plots (50:1) and very high in the montane conifer plots (80:1). Net N mineralization during the summer months was correspondingly low (1.2 and 2.2 kg ha À1 , respectively). The high litter lignin content and associated low rate of N mineralization can explain the extremely low concentrations of mineral N in soils and upland streams of this region. In the broadleaf evergreen coastal forest plots, lignin/N ratio was lower (23:1) and N mineralized was considerably greater over the same measurement period than in the montane forest plots (14 kg ha À1). In contrast to findings in many cool temperate northern hemisphere forests, ANNP in the broadleaf forest type was high (average 11.1 Mg ha À1 yr À1) in spite of the low net N mineralization rates, and ANPP and net N mineralized were not correlated. Net N mineralization was best correlated with litter quality, soil temperature, and soil moisture content, and ANPP was best correlated with growing degree days. Site Description Isla de Chiloé is located off the coast of southern Chile. Low mountains of the CP run the length of the island's west

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confidence: 99%

Litter Quality and Climate Decouple Nitrogen Mineralization and Productivity in Chilean Temperate Rainforests

Joshi

Vann

Johnson

2006

Soil Science Soc of Amer J

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“…La elevada altitud y complejidad fisiográfica de esta cadena montañosa influyen en la circulación del aire y condicionan el clima (Emck et al, 2006;Young, 2011), influenciando de forma importante los regímenes hidrológicos de sus ríos (Montgomery et al, 2001;Argollo, 2006). Estas particularidades de la zona andina explican la complejidad ecosistémica existente (Hedin & Hetherington, 1996;Jacobsen et al, 1997;Gaston, 2000;Jacobsen, 2003;Corigliano et al, 2005;Argollo, 2006;Ellenrieder, 2007;Jacobsen, 2008;Palma & Figueroa, 2008). Con respecto a los ecosistemas fluviales, si bien los estudios que se han realizado para caracterizar los ríos andinos son escasos (Domínguez-Granda et al, 2005;Segnini & Chacón, 2005), los datos publicados indican que los ríos altoandinos son muy variables y muestran fluctuaciones importantes en sus características físicas y químicas (e.g., caudal, temperatura, oxígeno disuelto, pH, conductividad) (González et al, 2004;Jacobsen, 2004;Jacobsen & Brodersen, 2008), tanto a nivel espacial como temporal, incluyendo la fluctuación diaria extrema en algunos de ellos.…”

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Caracterizacion fisica, quimica e hidromorfologica de los rios altoandinos tropicales de Ecuador y Peru

Villamarín

Prat

Rieradevall

2014

lajar

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RESUMEN. Para comprender la variabilidad física, química e hidromorfológica de los ríos en la zona altoandina tropical (sobre los 2000 msnm) se muestrearon 123 ríos de ocho cuencas hidrográficas de Ecuador y Perú, seleccionados según criterios de distribución en latitud y altitud, así como el grado de alteración antrópica. Los muestreos se realizaron entre octubre 2007 y octubre 2008, coincidiendo con la época seca en ambos paises. En cada localidad se midieron tanto parámetros físicos y químicos (i.e., temperatura, oxígeno disuelto, conductividad, fosfatos, nitritos, nitratos, amonio, etc.) como hidromorfológicos (i.e., altitud, índice de calidad riparia (QBR), calidad y naturalidad de la cubierta vegetal de la ribera, naturalidad del canal fluvial, índice del hábitat fluvial (IHF), frecuencia de rápidos, composición del sustrato). A nivel regional (entre cuencas) la mineralización, las características hidromorfológicas y la heterogeneidad del hábitat mostraron ser los factores de mayor importancia para explicar la variabilidad encontrada. La temperatura, oxígeno disuelto y heterogeneidad del hábitat fueron los parámetros relevantes en el gradiente altitudinal, mientras que la mineralización lo fue en el gradiente latitudinal. La significación o importancia de un factor u otro parecen estar determinados en gran medida por el nivel espacial estudiado (localidad, cuenca, región). Sin embargo, se determinó que a nivel regional la altitud y las variables que cambiaron con ella, como temperatura y oxígeno disuelto, son siempre significativas independientemente de la ubicación latitudinal de la cuenca. Palabras clave: ríos altoandinos tropicales, altitud, latitud, variables físicas y químicas, variables hidromorfológicas, Perú, Ecuador. In each locality both, physical and chemical (i.e., temperature, dissolved oxygen, conductivity, phosphates, nitrites, nitrates, ammonia, etc.) and hydromorphological (i.e., altitude, riparian quality index (QBR), degree of vegetal cover in the stream zone, riparian cover structure and quality, naturalness of the stream channel, aquatic habitat quality index (IHF), substrate composition, rapids frequency, elements of heterogeneity) variables were measured. At regional level (between basins), the mineralization, the hydromorphological features and the aquatic habitat heterogeneity were the most important factors explaining environmental variability. Meanwhile the temperature dissolved, oxygen and habitat heterogeneity parameters were shown to be relevant in the altitudinal gradient, while the mineralization was it in the latitudinal gradient. The importance of each factor is related to the spatial scale studied (site, basin, region). However, the altitude and variables changing with it, as temperature and dissolved oxygen, shown similar patterns regardless of the latitudinal location of the basin. Physical, chemical and hydromorphological characterization of Ecuador and

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Water and nutrient fluxes in a cool temperate rainforest at the Cordillera de la Costa in southern Chile

1998

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Atmospheric and Geologic Constraints on the Biogeochemistry of North and South American Temperate Rainforests

Cited by 8 publications

References 28 publications

Litter Quality and Climate Decouple Nitrogen Mineralization and Productivity in Chilean Temperate Rainforests

Litter Quality and Climate Decouple Nitrogen Mineralization and Productivity in Chilean Temperate Rainforests

Caracterizacion fisica, quimica e hidromorfologica de los rios altoandinos tropicales de Ecuador y Peru

Water and nutrient fluxes in a cool temperate rainforest at the Cordillera de la Costa in southern Chile

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