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| Oyarzún,Carlos E.; Huber,Anton. |
| Measuring nutrients fluxes in watersheds with different landuse is important for evaluating the effects of conversion of native forests to agricultural land, and for establishing guidelines for land management. Nitrogen (N) concentrations and fluxes were studied over a 12-month period in four watersheds in the Lake Rupanco basin in the Andean Cordillera and four watersheds located in the Lake Huillinco basin in the Coastal Cordillera of southern Chile. Two watersheds in either lake basins were covered mainly by native rainforests, and the other two had mixed landuse (livestock pastures, subsistence agriculture and shrub-pasture mixtures). In the Lake Rupanco area, the annual transport of NO3-N from forested and agricultural watersheds was 4.9 and 11.0 kg... |
| Tipo: Journal article |
Palavras-chave: Landuse; Native forest; Nitrogen fluxes; Non-point pollution. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100010 |
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| Nordblom, Thomas L.; Hume, Iain H.; Bathgate, Andrew D.; Reynolds, Michael. |
| Land managers in upper catchments are being asked to make expensive changes in land use, such as by planting trees, to attain environmental service targets, including reduced salt loads in rivers, to meet needs of downstream towns, farms and natural habitats. End-of-valley targets for salt loads have sometimes been set without a quantitative model of cause and effect regarding impacts on water yields, economic efficiency or distribution of costs and benefits among stakeholders. This paper presents a method for calculating a ‘menu’ of technically feasible options for changes from current to future mean water yields and salt loads from upstream catchments having local groundwater flow systems, and the land-use changes to attain each of these options at... |
| Tipo: Journal Article |
Palavras-chave: Discounting; Landuse; NPV; Opportunity-cost; Salinity; Resource /Energy Economics and Policy. |
| Ano: 2006 |
URL: http://purl.umn.edu/116973 |
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| Roeder, Norbert; Osterburg, Bernhard. |
| Roughly 6.5% of the German utilized agricultural area is located on organic soils (fens and bogs). Nevertheless, the drainage of these areas in order to allow their agricultural utilization causes roughly a third of the greenhouse gas emissions (GHG) of the German agricultural sector, being equivalent to 4% of the total German GHG emissions. Obviously, German policies trying to reduce the GHG emissions successfully must tackle this issue. The abandonment of the cultivation of organic soils would be an effective policy to reduce the GHG emissions however the question remains whether it is an efficient measure compared with the other options? In the paper we assess the mitigation costs on the basis of the standard gross margin and tenure of the... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: GHG-Mitigation; Landuse; Peatland; Environmental Economics and Policy; Land Economics/Use. |
| Ano: 2011 |
URL: http://purl.umn.edu/115983 |
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| LANDER,TONYA A; HARRIS,STEPHEN A; BOSHIER,DAVID H. |
| This study was undertaken to discover whether patterns of flower and fruit production for Gomortega keule, an endangered Chilean tree, differ between exotic pine plantation, agricultural and native forest environments. A pilot study was also undertaken to identify the primary pollinators of G. keule. Although similar proportions of G. keule trees flowered in the agricultural and native forest áreas, more trees in the agricultural sites produced fruit compared to trees in the native forest sites. Flowering and fruiting of G. keule was extremely rare in the exotic pine plantations. Our data show that G. keule flowers are predominantly visited by syrphid flies in March-April, and that syrphids carry a greater proportion of G. keule pollen than the other... |
| Tipo: Journal article |
Palavras-chave: Chile; Gomortega; Landuse; Pollination; Syrphid. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000300007 |
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