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The Global ETD Search service is a free service for researchers
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Showing 1 to 10 of 11 (0.04 seconds)Spelling suggestions: "subject:"bergregenwald"" "subject:"bergeregenwald""
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Soil respiration, microbial respiration and mineralisation in soils of montane rainforests of Southern Ecuador: influence of altitudeIost, Susanne 26 January 2008 (has links) (PDF)
Impacts of land use and climate change in tropical forests on the global carbon budget are of principal interest in the recent research, as these forests amount to about 48 % of the world’s forested area. Interest has been focused on lowland tropical forests mainly, but tropical montane forests occupy about 20 % of all tropical forests. Soils of tropical montane forests are frequently waterlogged and characterised by high soil organic carbon stocks. Furthermore, along altitudinal gradients, changes in stand structure and net primary production can be observed that have not been fully explained yet. As causes reduced microbial activity and nitrogen turnover in soils of tropical montane forests have been suggested. Against the background of climate change, carbon turnover mechanisms in soils of these forests are of special interest. The present study therefore aimed at determining and quantifying relevant carbon and nitrogen pools as well as nitrogen mineralisation potentials. Furthermore, size, activity, and structure of microbial biomass were characterised. The collected data was supposed to provide basic knowledge on carbon and nitrogen cycling in tropical montane forest soils. Thus, evaluation of the susceptibility of their carbon stocks for climate change as well as nitrogen and carbon limitation of microbial organic matter decomposition was possible. Field work of this study was conducted during 2003–2005 at an altitudinal transect that in- cluded five study sites between 1 050 and 3 060 m amsl. Total soil respiration was recorded biweekly over two years, the contribution of roots to total soil CO2 efflux over one year. Soils of the study sites were sampled twice and biochemical and microbial parameters were determined.
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Fine root dynamics and resource uptake in a South Ecuadorian mountain rainforest as dependent on elevation / Feinwurzeldynamik und Ressourcenaufnahme in einem Südecuadorianischen Bergregenwald in Abhängigkeit von der MeereshöheGraefe, Sophie 04 September 2008 (has links)
No description available.
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Trace Gas Fluxes from Tropical Montane Forests of Southern Ecuador / Spurengasflüsse in Tropischen Bergregenwäldern im Süden EkuadorsMartinson, Guntars O. 28 March 2011 (has links)
No description available.
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Soil respiration, microbial respiration and mineralisation in soils of montane rainforests of Southern Ecuador: influence of altitudeIost, Susanne 07 December 2007 (has links)
Impacts of land use and climate change in tropical forests on the global carbon budget are of principal interest in the recent research, as these forests amount to about 48 % of the world’s forested area. Interest has been focused on lowland tropical forests mainly, but tropical montane forests occupy about 20 % of all tropical forests. Soils of tropical montane forests are frequently waterlogged and characterised by high soil organic carbon stocks. Furthermore, along altitudinal gradients, changes in stand structure and net primary production can be observed that have not been fully explained yet. As causes reduced microbial activity and nitrogen turnover in soils of tropical montane forests have been suggested. Against the background of climate change, carbon turnover mechanisms in soils of these forests are of special interest. The present study therefore aimed at determining and quantifying relevant carbon and nitrogen pools as well as nitrogen mineralisation potentials. Furthermore, size, activity, and structure of microbial biomass were characterised. The collected data was supposed to provide basic knowledge on carbon and nitrogen cycling in tropical montane forest soils. Thus, evaluation of the susceptibility of their carbon stocks for climate change as well as nitrogen and carbon limitation of microbial organic matter decomposition was possible. Field work of this study was conducted during 2003–2005 at an altitudinal transect that in- cluded five study sites between 1 050 and 3 060 m amsl. Total soil respiration was recorded biweekly over two years, the contribution of roots to total soil CO2 efflux over one year. Soils of the study sites were sampled twice and biochemical and microbial parameters were determined.
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Die Bedeutung der Epiphyten im ökosystemaren Wasser- und Nährstoffumsatz verschiedener Altersstadien eines Bergregenwaldes in Costa Rica / The significance of epiphytes to water and nutrient fluxes in different successional stages of a montane rainforest in Costa RicaKöhler, Lars 31 October 2002 (has links)
No description available.
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Factors controlling the lower elevational limits in tropical montane plants in the Andes and their implications under the current climatic change / Untere Höhengrenzen der Verbreitung von Pflanzenarten in den bolivianischen Anden und ihre Reaktionen auf zukünftige KlimaveränderungenJacome Reyes, Jorge Hernan 03 November 2005 (has links)
No description available.
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Elevation Effects on Key Processes of Carbon Cycling in South Ecuadorian Mountain Forests / Der Einfluss der Meereshöhe auf Schlüsselprozesse des Kohlenstoffkreislaufs in Südecuadorianischen BergregenwäldernMoser, Gerald 24 January 2008 (has links)
No description available.
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Struktur und Dynamik des Feinwurzelsystems von tropischen Bergwäldern in Abhängigkeit von der Meereshöhe in Südecuador / Structure and dynamics of the fine root system of tropical montane forests along an elevational gradient in South EcuadorRöderstein, Marina 04 July 2006 (has links)
Se investigó la estructura y la dinámica de las
raíces finas a lo largo de un gradiente altitudinal en
un bosque montano de lluvioso en el sur de Ecuador. Se
estudió la biomasa y la necromasa de las raíces finas,
la distribución espacial, la morfología de las raíces
vivas y muertas asi como su distribución temporal en
tres localidades ubicadas a 1890 m, 2380 m y 3060 m
sobre el nivel del mar.Se pudo comprobar un incremento de la masa de las
raíces finas en la capa orgánica y en el suelo mineral
(0-20 cm) con el aumento de altitud. La misma tendencia
se observó en la biomasa de las raíces finas y en la
necromasa, que aumentaron de 393 a 978 g m-2
y de 640 a 2398 g m-2, respectivamente. El
contenido de agua en el suelo se matuvó entre 20 y 30
Vol. %. La relación de bio- y necromasa varió bastante.
La fluctuación temporal de las raíces finas no mostró
ninguna concordancia con las temporadas climáticas. La
producción de las raíces finas aumentó con la altitud
de 676 a 2193 g m-2, así como también la
producción de necromasa de raíces finas que aumentó de
523 a 2085 g m-2. El tiempo de vida de las
raíces finas se estimó entre 0.75 y 0.44 años
aproximadamente, al mismo tiempo la masa de las raíces
finas era renovada.
Experimentos sobre la descomposición biológica con
bolsas de hojarasca (litter bags) monstraron que la
tasa de descomposición disminuye con el aumento de
altitud. La superficie específica de las raíces (SRA)
también diminuyó con el aumento de altitud asi como la
superficie específica de las ojas (SLA). El índice
areal des las raíces (RAI) aumentó por causa del
aumento de la biomasa de las raíces finas. La
producción de hojarasca disminuyó con el aumento de
altitud, mientras que simultaneamente crecía la masa de
las raíces finas y disminuía la altura de los
árboles.Se pudo comprobar estadísticamente una relación
entre la masa de las raíces finas y la producción de
hojarasca con la altitud sobre el nivel del mar. La
superficie específica de las raíces (SRA), la
producción de las raíces finas y su mortalidad
monstraron también una dependencia con la altitud, la
temperatura del aire, el contenido de nitrógeno, los
parámetros morfológicos (SLA, SRA), la altura media del
tronco y el diámetro medio del tronco (medido a un 1.3
m). Se encontró una correlación negativa entre la
precipitación y la tasa de retorno y la expectativa de
vida de las raíces finas.
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Effekte anthropogener Störung auf die Diversität kryptogamischer Epiphyten (Flechten, Moose) in einem Bergregenwald in Südecuador / Effects of anthropogenic disturbance on the diversity of cryptogamic epiphytes (lichens, bryophytes) in mountain forest of southern EcuadorNöske, Nicole 27 January 2005 (has links)
No description available.
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Effects of increased nitrogen input on the net primary production of a tropical lower montane rain foest, Panama / Auswirkungen erhöhter Stickstoffzufuhr auf die Netto-Primärproduktion eines tropischen Bergregenwaldes in PanamaAdamek, Markus 18 June 2009 (has links)
No description available.
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