Consulta: subjectFacets:"Water sources"
Registros recuperados: 2
Data/hora: 27/07/2024 03:02:43

Disposition of precipitation: Supply and Demand for Water Use by New Tree Plantations
Provedor de dados: 31
Autores: Nordblom,   Thomas L.; Finlayson,   John D.; Hume,   Iain H.
As the greatest rainwater users among all vegetative land covers, tree plantations have been employed strategically to mitigate salinity and water-logging problems. However, large-scale commercial tree plantations in high rainfall areas reduce fresh water inflows to river systems supporting downstream communities, agricultural industries and wetland environmental assets. A bio-economic model was used to estimate economic demand for water by future upstream plantations in a sub-catchment (the 2.8 million ha Macquarie valley in NSW) of the Murray-Darling Basin, Australia. Given four tree-product values, impacts were simulated under two settings: without and with the requirement that permanent water entitlements be purchased from downstream entitlement...
Tipo: Conference Paper or Presentation
Palavras-chave: Environmental Economics and Policy; Forest; Environmental services; Catchment; Water sources; Interception; Entitlement; Supply; Demand; Market; Economic surplus; Evapo-transpiration; Urban water; Irrigation; Wetlands.
Ano: 2011
URL: http://purl.umn.edu/101225

Methane fluxes from waterlogged and drained Histosols of highland areas
Provedor de dados: 90
Autores: Rachwal,Marcos Fernando Glück; Zanatta,Josiléia Acordi; Dieckow,Jeferson; Denega,Genuir Luis; Curcio,Gustavo Ribas; Bayer,Cimélio.
Soil can be either source or sink of methane (CH4), depending on the balance between methanogenesis and methanotrophy, which are determined by pedological, climatic and management factors. The objective of this study was to assess the impact of drainage of a highland Haplic Histosol on CH4 fluxes. Field research was carried out in Ponta Grossa (Paraná, Brazil) based on the measurement of CH4 fluxes by the static chamber method in natural and drained Histosol, over one year (17 sampling events). The natural Histosol showed net CH4 eflux, with rates varying from 238 µg m-2 h-1 CH4, in cool/cold periods, to 2,850 µg m-2 h-1 CH4, in warm/hot periods, resulting a cumulative emission of 116 kg ha-1 yr-1 CH4. In the opposite, the drained Histosol showed net...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Greenhouse gas; Water sources; Water-table; Gravimetric moisture; Air temperature; Rainfall.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000200013