|
|
|
| Registros recuperados: 11 | |
|
| |
|
| |
|
| |
|
|
| Chaves,Aridênia P; Bezerra Neto,Francisco; Lima,Jailma SS; Silva,Josimar N; Nunes,Renato LC; Barros Júnior,Aurélio P; Lima,Grace KL; Santos,Elizangela C. |
| ABSTRACT The objective of this work was to evaluate the effect of planting spatial arrangements between the cowpea and beet crops in intercropping and of cowpea population densities on the crop’s productivity and in the agro-economic efficiency of the association at two growing seasons. The experimental design was of randomised blocks with the treatments arranged in a 4 x 3 factorial scheme, in four replications. The first factor was constituted by three spatial arrangements between the component cultures (2:2, 3:3 and 4:4), formed by beet rows alternated with cowpea rows, while the second factor was constituted by the population densities of cowpea: 40, 60, 80 and 100% of the recommended population in single crop (RDSC). The production and its components... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vigna unguiculata; Beta vulgaris; Complementarity; Mixed-cropping revenues. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000200192 |
| |
|
| |
|
|
| Trevilla-Rebollar,Antonio; Deloya,Cuauhtémoc; Padilla-Ramírez,Jorge. |
| Collections were made during one year, between August 2005 and July 2006, in Malinalco, State of Mexico, in three sites of tropical deciduous forest, a pasture and a induced forest of pine-oak, established in a altitudinal gradient ranging from 1,253 m to 2,300 m. The total of 7,680 specimens Scarabaeidae, Silphidae and Trogidae were captured through NTP-80, representing 18 genera and 38 species. Onthophagus and Canthon contained 46% of the richness of Scarabaeidae. The more distant sites were complementary in their species composition. The lowest complementarity occurred between sites with tropical deciduous forest. It revises the material collected through pitffal traps and light traps funnel type, increasing the list of 38 to 50 species in the study... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diversity; Complementarity; Faunistic similarity. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000400005 |
| |
|
|
| Chavas, Jean-Paul. |
| The paper investigates the value of biodiversity as it relates to the productive value of services provided by an ecosystem. It analyzes how the value of an ecosystem can be "greater than the sum of its parts." First, it proposes a general measure of the value of biodiversity. Second, this measure is decomposed into four components, reflecting the role of complementarity, scale, convexity, and catalytic effects. This provides new information on the sources and determinants of biodiversity value. Third, the paper examines the role of uncertainty. In this context, the role of risk and of downside-risk exposure and their effects on the value of biodiversity are explored. This provides useful insights on how management and policy decisions can affect the value... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Biodiversity; Productive value; Complementarity; Scale; Convexity; Catalytic effect; Uncertainty; Environmental Economics and Policy; D6; Q2; Q5. |
| Ano: 2006 |
URL: http://purl.umn.edu/21280 |
| |
|
| |
|
| |
|
|
| Smith, V. Kerry. |
| This paper considers the modeling strategies that have been used to incorporate time in revealed and stated preference methods for valuing environmental resources. After reviewing a subset of the economic models for describing time as an input to household production; time in creating habits and persistence in demand for particular services of environmental resources, and time as offering an opportunity for future consumption, the overview suggests that time has been used as a complement in production or consumption to marketed goods in each of these frameworks. The paper suggests two possible alternatives. This structure along with further restrictions to preferences or technology implies that there are other strategies for using revealed preference data... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Time; Revealed preference; Complementarity; Environmental Economics and Policy; Q20; Q26; H40. |
| Ano: 1997 |
URL: http://purl.umn.edu/10485 |
| |
|
| |
| Registros recuperados: 11 | |
|
|
|
