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Registros recuperados: 6
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Changes in population and land use over time in the Ecuadorian Amazon Acta Amazonica
Bilsborrow,Richard E.; Barbieri,Alisson F.; Pan,William.
This paper draws upon a detailed longitudinal survey of households living on agricultural plots in the northern three provinces of the Ecuadorian Amazon, the principal region of colonization by migrants in Ecuador since the 1970s. Following the discovery of petroleum in 1967 near what has subsequently come to be the provincial capital and largest Amazonian city of Lago Agrio, oil companies built roads to lay pipelines to extract and pump oil across the Andes for export. As a result, for the past 30 years over half of both Ecuador's export earnings and government revenues have come from petroleum extracted from this region. But the roads also facilitated massive spontaneous in-migration of families from origin areas in the Ecuadorian Sierra, characterized...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ecuadorian Amazon; Agricultural colonization; Population change; Land use change; Migration.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672004000400015
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Energy Use in the U.S. Food System AgEcon
Canning, Patrick N.; Charles, Ainsley; Huang, Sonja; Polenske, Karen R.; Waters, Arnold.
Energy is an important input in growing, processing, packaging, distributing, storing, preparing, serving, and disposing of food. Analysis using the two most recent U.S. benchmark input-output accounts and a national energy data system shows that in the United States, use of energy along the food chain for food purchases by or for U.S. households increased between 1997 and 2002 at more than six times the rate of increase in total domestic energy use. This increase in food-related energy flows is over 80 percent of energy flow increases nationwide over the period. The use of more energy-intensive technologies throughout the U.S. food system accounted for half of this increase, with the remainder attributed to population growth and higher real...
Tipo: Report Palavras-chave: Energy use; Energy technologies; Food expenditures; Input-output analysis; Population change; Structural decomposition analysis; Supply chain analysis; Resource /Energy Economics and Policy.
Ano: 2010 URL: http://purl.umn.edu/59381
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Examining Factors Affecting Population Change in the Southern United States: An Ongoing Case Study AgEcon
Hill, Anquinette; Gyawali, Buddhi Raj; Banerjee, Swagata (Ban).
Urban sprawl and rural rebound are major foci of recent regional economic studies. Using 1980 and 2000 Census data from 11 southern states, binary logit regressions of population changes in rural-and-metropolitan counties and Black Belt-and-non-Black Belt counties reveal education, poverty, employment, and age differences are related to population changes.
Tipo: Conference Paper or Presentation Palavras-chave: African Americans; Black Belt; Census; Population change; Rural rebound; Urban Sprawl; Southern; Community/Rural/Urban Development; Labor and Human Capital.
Ano: 2010 URL: http://purl.umn.edu/56598
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Is Income Inequality Endogenous in Regional Growth? AgEcon
Hailu, Yohannes G.; Kahsai, Mulugeta S.; Gebremedhin, Tesfa G.; Jackson, Randall W..
This study focuses on testing the relationship between income inequality and growth within U.S. counties, and the channels through which such effects are observed. The study tests three hypotheses: (1) income inequality has an inverse relationship with growth; (2) regional growth adjustments are the channels through which the inequality and growth are equilibrated; and (3) income inequality is endogenous to regional growth and its adjustment. Results, based on a system of equations estimation, confirm the hypotheses that income inequality has a growth dampening effect; income inequality is endogenous to regional growth and growth adjustment; and the channels through which income inequality determines growth are regional growth adjustments, such as...
Tipo: Conference Paper or Presentation Palavras-chave: Income inequality; Economic growth; Gini coefficient; Growth modeling; Population change; Per capita income; Community/Rural/Urban Development; Public Economics; I32; J15; O18; P25; R11; R23; R25; R51; R53; R58.
Ano: 2009 URL: http://purl.umn.edu/46320
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NATURAL AMENITIES DRIVE RURAL POPULATION CHANGE AgEcon
McGranahan, David A..
Climate, topography, and water area are highly related to rural county population change over the past 25 years. A natural amenities index, derived and discussed here, captures much of this relationship. Average 1970-96 population change in nonmetropolitan counties was I percent among counties low on the natural amenities index and 120 percent among counties high on the index. Most retirement counties and recreation counties score in the top quarter of the amenities index. Employment change is also highly related to natural amenities, although more so over the past 25 years than in the current decade. The importance of particular amentities varies by region. In the Midwest, for example, people are drawn to lakes for recreation and retirement, while...
Tipo: Report Palavras-chave: Natural amenities; Population change; Retirement; Recreation; Community/Rural/Urban Development; Resource /Energy Economics and Policy.
Ano: 1999 URL: http://purl.umn.edu/33955
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臺灣地區西瓜根瘤線蟲之發生及防治 Taiwan Agricultural Research Institute
杜金池; 程永雄; 王貴美; 蔡東纂; C.C. Tu;Y.H. Cheng;K.M. Wang;T.T. Tsay.
[[abstract]]本省西瓜栽作型態大抵分為三種:旱田輪作、蔗田輪作、及河床地連作;其罹患根瘤線蟲之發病率分別為55%,57.5%,及60%,病原主要為南方根瘤線蟲(Meloidogyne incognita)爪哇根瘤線蟲(M. javanica)次之。旱田西瓜園之根瘤線蟲族群高峰期在7月至9月間,而12月至1月較低;蔗田西瓜園之高峰期自6月至10月,而低族群密度在1月至3月,河床地西瓜園之根瘤線蟲族群消長曲線最尖,在7、8兩個月為高峰,11月後族群顯著地降低。田間調查結果顯示,根瘤線蟲和蔓割病菌之複合感染率,以河床地之16.5%為最高,蔗田之11.5%次之,旱田之11%最低。田間防治試驗結果顯示,以施用幾丁質添加物(Clandosan),殺線蟲劑抗蟲得(10% Controven G.),及燻蒸劑溴化甲院(Bromomethane)對根瘤線蟲之防治效果最佳,其根瘤指數分別為2.0、2.1及2.8和對照組之4.0有顯著差異;而果實品質以施用幾丁質添加物者最佳;其平均甜度為11.5Brix;產量則各處理間以幾丁質添加物及一般有機質添加物為最好,但統計分析結果,差異不顯著。
Palavras-chave: 西瓜 根瘤線蟲 族群消長 幾丁質添加物 殺線蟲劑 watermelon; Root-kont nematode; Population change; Chitinous amendment; Nematicide [[classification]]10.
Ano: 1990
Registros recuperados: 6
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