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| Registros recuperados: 55 | |
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| Li, Tao; Gao, Yi; Li, Xiao-min; Li, Tuan-jie; Li, Xiao-ming; Yang, Qin. |
| Abstract Under the support of the remote sensing and geographical information system (GIS) techniques, we acquire the land use data in 1990 and 2008 regarding 6 inhabited islands, namely Longxue Island, Hengmen Island, Weiyuan Island, Oi'ao Island, Hengqin Island and Gaolan Island in Pearl River Estuary . By using dynamic degree of land use, land use change intensity, relative change rate and other indicators, we conduct quantitative description, and thus quantitatively and qualitatively analyze characteristics of temporal evolution and law of spatial pattern change concerning land use of each island. The study indicates that in the period 1990 2008, the area of construction land and water in 6 islands increased, while the area of agricultural land and... |
| Tipo: Article |
Palavras-chave: Land use change; Remote sensing; Spatio-temporal evolution; Pearl River Estuary; Inhabited islands; China; Agribusiness. |
| Ano: 2011 |
URL: http://purl.umn.edu/122942 |
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| Taheripour, Farzad; Tyner, Wallace E.. |
| The economic and land use consequences of US biofuel programs and their contributions to GHG emissions have been the focal point of many debates and research studies in recent years. However, most of these studies focused on the land use emissions due to the first generation of biofuels such as corn ethanol, sugarcane ethanol, and biodiesel (e.g. [1, 2] [3, 4]). A quick literature review indicates that only a few attempts have been made to estimate these emissions for the second generation of biofuels which convert cellulosic materials into liquid fuels. Gurgel et al. [5] have used a highly aggregated computational model (CGE) to evaluate land use consequences of producing biofuels from biomass feedstock. This model does not distinguish between the first... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Biofuels; Cellullosic feedstocks; Land use change; Resource /Energy Economics and Policy. |
| Ano: 2011 |
URL: http://purl.umn.edu/103559 |
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| Harris, Simon; Elliott, Sandy; McBride, Graham; Shankar, Ude; Quinn, John; Wheeler, David; Wedderburn, Liz; Hewitt, Allan; Gibb, Robert; Parfitt, Roger; Clothier, Brent; Green, Steve; Munguia, Oscar Montes de Oca; Dake, Chris K.G.; Rys, Gerald. |
| The CLUES model is an integrated catchment based model that designed to assist policy makers in understanding the implications of land use scenarios for water quality and a range of other indicators. CLUES integrates a number of existing models from several research providers, including SPARROW (catchment hydrology), OVERSEER and SPASMO (nutrient losses), ENSUS (nitrate leaching risk), and a socioeconomic model. These are combined in a GIS framework which allows scenarios of land use to be assessed in a spatial manner. Regional council staff have been trained in its use, and the model is under ongoing development in response to feedback from users. This paper discusses the overall framework of the CLUES model, and discusses in greater depth the... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Sustainability indicators; Catchment models; Water quality; Economic impacts; Land use change; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Political Economy. |
| Ano: 2009 |
URL: http://purl.umn.edu/97166 |
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| Freitas,Rita de Cássia Alves de; Popin,Gustavo Vicentini; Milori,Débora Marcondes Bastos Pereira; Signor,Diana; Drumond,Marcos Antônio; Cerri,Carlos Eduardo Pellegrino. |
| ABSTRACT The substitution of native vegetation by agricultural ecosystems can change the quantity and quality of soil organic matter (SOM), and the intensity of these changes depends on the soil type, climate, and land use. The objective of this study was to evaluate the quality of organic matter in chronosequences of Jatropha cultivation in contrasting soil and climatic conditions. Soil samples were evaluated at depths of 0.00-0.10, 0.20-0.30, and 0.80-1.00 m in chronosequences located in Planaltina, Distrito Federal (Cerrado-Pasture-Jatropha), Dourados, Mato Grosso do Sul (Atlantic Forest-Corn-Jatropha), and Araripina, Pernambuco (Caatinga-Jatropha). To assess SOM quality, we determined C contents in the SOM fractions, C stocks, the carbon management... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Land use change; Soil carbon fractionation; Carbon management index; Laser-induced fluorescence spectroscopy; Microbial biomass. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100508 |
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| Lima,Augusto Miguel Nascimento; Silva,Ivo Ribeiro da; Stape,Jose Luis; Mendonça,Eduardo Sá; Novais,Roberto Ferreira; Barros,Nairam Félix de; Neves,Júlio César Lima; Paul,Keryn; Schulthais,Fernanda; Polglase,Phill; Raison,John; Soares,Emanuelle Mercês Barros. |
| Soil organic matter (SOM) plays an important role in carbon (C) cycle and soil quality. Considering the complexity of factors that control SOM cycling and the long time it usually takes to observe changes in SOM stocks, modeling constitutes a very important tool to understand SOM cycling in forest soils. The following hypotheses were tested: (i) soil organic carbon (SOC) stocks would be higher after several rotations of eucalyptus than in low-productivity pastures; (ii) SOC values simulated by the Century model would describe the data better than the mean of observations. So, the aims of the current study were: (i) to evaluate the SOM dynamics using the Century model to simulate the changes of C stocks for two eucalyptus chronosequences in the Rio Doce... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil organic matter; Land use change; Reforestation. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300018 |
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| Ćirić,Vladimir; Manojlović,Maja; Belić,Milivoj; Nešić,Ljiljana; Šeremešić,Srdan. |
| Aggregate stability is an important factor of the soil functioning. Greater aggregate stability leads to greater soil organic carbon (SOC) preservation, while SOC acts as a key cementing agent in aggregation processes. The objective of this study was to investigate the effects of native vegetation conversion in soil aggregate stability and SOC concentration. The investigation was conducted in the Vojvodina Province, Serbia, in July 2009. Undisturbed soil samples were taken from Haplic Chernozem, Haplic Fluvisol and Gleyic Vertisol, at a depth ranging from 0 to 20 cm. A completely randomized experimental design was used with three replicates. Each soil type was considered under treatments 1) cropland >100 years, 2) native meadow and 3) native... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aggregate stability; Soil organic carbon; Land use change; Soil type; Soil structure. |
| Ano: 2013 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952013000600002 |
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| Mazzetto,Andre Mancebo; Feigl,Brigitte Josefine; Cerri,Carlos Eduardo Pellegrino; Cerri,Carlos Clemente. |
| Abstract Land use changes strongly impact soil functions, particularly microbial biomass diversity and activity. We hypothesized that the catabolic respiration response of the microbial biomass would differ depending on land use and that these differences would be consistent at the landscape scale. In the present study, we analyzed the catabolic response profile of the soil microbial biomass through substrate-induced respiration in different land uses over a wide geographical range in Mato Grosso and Rondônia state (Southwest Amazon region). We analyzed the differences among native areas, pastures and crop areas and within each land use and examined only native areas (Forest, Dense Cerrado and Cerrado), pastures (Nominal, Degraded and Improved) and crop... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon region; Land use change; Catabolic profile; Microbial communities. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000100063 |
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| Youlton,Cristian; Bragion,Ana Paula; Wendland,Edson. |
| C. Youlton, A. P. Bragion, and E. Wendland. 2016. Experimental evaluation of sediment yield in the first year after replacement of pastures by sugarcane. Cien. Inv. Agr. 43(3): 374383. Sugarcane cultivation has expanded in south-eastern Brazil in the last decade, mainly for biofuel (ethanol) production. This expansion has occurred on land that was originally covered with pasture and used for livestock production. The purpose of this study is to experimentally determine the impact on runoff and erosion produced by replacing pasture with sugarcane. Runoff plots of 100 m² were established at a farm in Itirapina, Sao Paulo (SP), Brazil, on a hill with a 9% slope and sandy soil. An 18-year-old pasture and a new sugarcane plantation were studied. The degrees of... |
| Tipo: Journal article |
Palavras-chave: Land use change; Runoff; Sediment granulometry; Soil erosion. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000300005 |
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| Pinto,Leandro Campos; Zinn,Yuri Lopes; Mello,Carlos Rogério de; Owens,Phillip Ray; Norton,Lloyd Darrell; Curi,Nilton. |
| ABSTRACTUnderstanding soil formation processes across different landscapes is needed to predict how soil properties will respond to land use change. This study aimed to characterize mountainous Inceptisols (Cambisols) under high altitude subtropical climate in southeastern Brazil, by soil physical, chemical and micromorphological analyses, under native forest and pasture. The soil under pasture had a greater bulk density than under forest, resulting in a severe reduction of macroporosity. At two depths, coarse quartz grains are angular, suggesting absence of transportational processes, thus confirming an autochthonous pedogenesis from the underlying gneissic rock. Most feldspars were weathered beyond recognition, but mineral alteration was commonly seen... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil formation; Soil microstructure; Land use change; Forest soils. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000500455 |
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| Registros recuperados: 55 | |
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