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Acumulación de biomasa y carbono aéreo en bosques tropicales secundarios del sur de Quintana Roo, México. Colegio de Postgraduados
Puc Kauil, Ramiro.
Los bosques tropicales secundarios presentan una complejidad estructural y una gran diversidad de especies que los hacen altamente dinámicos y productivos. Sin embargo, su regeneración y trayectoria sucesional es variable de acuerdo a las características del ecosistema que se está regenerando y por los factores endogénos y exogénos que intervienen. Para conocer los cambios graduales y temporales que ocurren a través del tiempo, en este trabajo se determinaron los cambios en la fisonomía y dominancia estructural de especies arbóreas y la acumulación de biomasa y carbono aéreo en diferentes etapas sucesionales de la selva media subperennifolia del sur de Quintana Roo. Para ello, se eligieron 5 rodales con edades de siete, 15, 25, 35 y 46 años posteriores al...
Palavras-chave: Fisonomía; Riqueza y diversidad de especies; Physiognomy; Species richness and diversity; Succession; Biomass mean annual increment; Forestal; Maestría; Sucesión; Incremento medio anual en biomasa.
Ano: 2014 URL: http://hdl.handle.net/10521/2243
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Arboreous vegetation of an alluvial riparian forest and their soil relations: Porto Rico island, Paraná river, Brazil BABT
Campos,João Batista; Souza,Maria Conceição de.
The dynamics of alluvial deposits in floodplains forms islands and sandbanks. Deposits frequently accumulate at the river margins and on islands with consequent side growths. One of these sandbanks which started to form in 1952 annexed an area of 12.4ha to the Porto Rico island (53º15’W and 22º45’S). At present a forest fragment of approximately 2.0 ha exists in this place. The structural analysis of arboreous vegetation of this fragment showed a floristic gradient related to the physical and chemical variations of the substratum. High density of pioneer species associated to the absence of recruitment of new individuals of these and other successional categories indicated that the forest was impaired in its succession process. This fact could be...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Alluvial forest; Floodplain; Forest structure; Phytosociology; Riparian vegetation; Succession.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000200004
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ARRANJOS E ENCAMINHAMENTOS DA HERANÇA NA AGRICULTURA FAMILIAR AgEcon
Spanevello, Rosani Marisa; Lago, Adriano.
A problemática em torno da continuidade da agricultura familiar, expressa pela sucessão ou falta de sucessão do agricultor, reflete-se no encaminhamento da herança. É a permanência de pelo menos um dos filhos e a vontade de herdar o patrimônio familiar que garante a continuidade dos estabelecimentos. Estudos recentes mostram a falta de desejo dos filhos em suceder seus pais, especialmente às filhas. Assim, muitos estabelecimentos poderão não ter sucessor e conseqüentemente, inviabilizar a continuidade do mesmo, pois os pais não terão para quem deixar suas terras. Nesse sentido, é necessário entender como os agricultores estão procedendo o encaminhamento da herança, diante da possibilidade de ter ou não sucessores. Para tanto, alguns questionamentos guiam a...
Tipo: Conference Paper or Presentation Palavras-chave: Herança; Sucessão; Agricultura familiar; Reprodução social; Heritage; Succession; Familiar agriculture; Social reproduction; Farm Management.
Ano: 2008 URL: http://purl.umn.edu/113182
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Cambios en la vegetacion de un campo abandonado despues de un cultivo de trigo. Repositório Alice
BOCCANELLI, S. I.; PIRE, E. F.; TORRES, P. S.; LEWIS, J. P..
La vegetacion pristina de los campos altos del sur de Santa Fe (Argentina) son distintos tipos de flechillares caracterizados por la abundancia de varias especies del genero Stipa. Cuando un campo agricola se abandona suele revertir a las comunidades pristinas. El objeto de este trabajo es analizar los diez primeros anos de la sucesion secundaria de un campo sometido a agricultura durante largo tiempo que se abandono despues de un cultivo de trigo (Triticum aestivum). En el primer ano aparece trigo acompanado de malezas anuales (Chenopodium album y Portulaca oleracea); despues del primer ano una parcela fue colonizada por Baccharis salicifolia y las otras por Carduus acanthoides, Cerastium glomeratum, Ammi majus, etc. Los ultimos anos constituyen una etapa...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Pampa; Pradera; Triticum aestivum; Sucesion; Diversidad; Dinamica de la vegetacion; Grasslands; Succession; Diversity; Vegetation dynamics.
Ano: 1999 URL: http://www.alice.cnptia.embrapa.br/handle/doc/87005
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Community dynamics over a decadal scale at Logatchev, 14 degrees 45 ' N, Mid-Atlantic Ridge ArchiMer
Gebruk, Andrey; Fabri, Marie-claire; Briand, Patrick; Desbruyeres, Daniel.
Hydrothermal vent community dynamics over a ten year span was studied in the Logatchev area, 14 degrees 45'N on the Mid-Atlantic Ridge. On the SERPENTINE cruise in March 2007 with the RN Pourquoi pas? and the ROV Victor 6000 (IFREMER), composition, abundance and distribution of dominant megafauna at Logatchev were examined and compared to published data from 1997. Our results revealed notable changes in several community characteristics. The most significant changes evident in March 2007 compared to July 1997 were the increase up to by order of magnitude in the population density of predatory gastropods Phymorchynchus spp. at the site Irina-2 and disappearance of a live population of vesicomyids at the site Anya's Garden. Other notable differences between...
Tipo: Text Palavras-chave: Hydrothermal vent; Community dynamics; Succession; Phymorchynchus; Bathymodiolus puteoserpentis; Vesicomyids; Logatchev; Mid-Atlantic Ridge.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00019/13044/10156.pdf
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Disturbance and distributions: avoiding exclusion in a warming world Ecology and Society
Sheil, Douglas; Department of Ecology and Natural Resource Management (INA), Norwegian University of Life Sciences (NMBU); Douglas.Sheil@nmbu.no.
I highlight how disturbance determines species distributions and the implications for conservation practice. In particular, I describe opportunities to mitigate some of the threats to species resulting from climate change. Ecological theory shows that disturbance processes can often slow or prevent the exclusion of species by competitors and that different disturbance regimes result in different realized niches. There is much evidence of disturbance influencing where species occur. For example, disturbance can lower the high elevation treeline, thus expanding the area for high elevation vegetation that cannot otherwise persist under tree cover. The role of disturbance in influencing interspecific competition and resulting species persistence and...
Tipo: Peer-Reviewed Insight Palavras-chave: Coexistence; Competition-colonization trade-off; Competitive displacement; Competitive hierarchy; Elevation; Intermediate-disturbance-hypothesis; Source-sink dynamics; Succession.
Ano: 2016
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Diversity and structure of the tree community of a fragment of tropical secondary forest of the brazilian Atlantic Forest domain 15 and 40 years after logging Rev. Bras. Bot.
Oliveira Filho,Ary T.; Carvalho,Douglas A.; Vilela,Enivanis A.; Curi,Nilton; Fontes,Marco Aurélio L..
Two adjacent tracts of tropical secondary forest, situated in Itambé do Mato Dentro, south-eastern Brazil, which had been regenerating for 15 and 40 years after clearing, were compared with the purpose of detecting differences in species diversity and composition, species guild composition (regeneration, stratification and dispersion), and stand structure. Four and three 1,125 m² plots laid on the 15- and 40-year-old stands, respectively, sampled 2,430 trees with diameter at the base of the stem > 5 cm. The number of species (S = 199) was high for this forest type and significantly higher for the older stand. Tree density was significantly higher in the younger stand, particularly for smaller trees, whereas the two stands did not differ in both basal...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brazilian Atlantic forest; Forest regeneration; Succession; Tropical secondary forest.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000400009
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Diversity of arbuscular mycorrhizal fungi in forest ecosystems of Brazil: a review. Repositório Alice
WINAGRASKI, E; KASCHUK, G.; MONTEIRO, P. H. R.; AUER, C. G.; HIGA, A. R..
Plants can stablish symbiosis with arburcular mycorrhiza fungi (AMF), in which the fungus uses carbohydrates synthesized by plant photosynthesis in exchange for soil nutrients. AMF symbiosis may benefit plants by increasing the rates of nutrient uptake, tolerance to abiotic stresses, protection against pathogens and, by promoting resilience of forest species to adverse conditions. Knowledge about the diversity of mycorrhizas may help stablish relationships of species selection, AMF production and inoculation. Therefore, the objective of this review is to compile information to identify existing patterns in AMF diversity in Brazilian forest ecosystems. Compilation was based in 74 articles (in English, Portuguese and Spanish languages) searched in the Web of...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Bioma; Planted forest; Succession; Symbiotic association; Floresta plantada; AMF; Micorriza; Mycorrhizal fungi.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1108467
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Effects of initial functional-group composition on assembly trajectory in savanna restoration. Repositório Alice
COUTINHO, A. G.; ALVES, M.; SAMPAIO, A. B.; SCHMIDT, I. B.; VIEIRA, D. L. M..
bitstream/item/195688/1/Coutinho-et-al-2019-Applied-Vegetation-Science.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Assembly trajectory; Functional group; Invasive grasses; Priority effects; Savanna restoration; Species turnover; Succession; Cerrado; Direct seeding.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1108117
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Epibenthic colonization on an artificial reef in a stressed environment off the north coast of the Rio de Janeiro State, Brazil BABT
Krohling,Werther; Zalmon,Ilana Rosental.
The influence of sedimentation and turbidity caused by the pluviometric precipitation and by the Paraiba do Sul River during the summer was investigated on an artificial reef along the north coast of Rio de Janeiro, Brazil. Four recruitment and four cumulative plates were removed monthly (January 2002 to February 2003) from the external surface of the concrete reef modules. Empty space was not a limiting factor the recruitment. Turnover rate and structural difference index were higher in the first months and reflected low change in the species dominance during almost the entire study period. The high correlation between the precipitation and the empty space suggested that rain influence the recruitment and the succession. The recruitment was possible...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Recruitment; Succession; Benthic community structure; Natural disturbance.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000100025
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Evaluating the success of direct seeding for tropical forest restoration over ten years. Repositório Alice
FREITAS, M. G.; RODRIGUES, S. B.; CAMPOS-FILHO, E. M.; CARMO, G. H. P. do; VEIGA, J. M. da; JUNQUEIRA, R. G. P.; VIEIRA, D. L. M..
bitstream/item/195184/1/1-s2.0-S0378112718321534-main.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Succession; Chronosequence; Tree density; Ecological restoration; Seedlings; Biomass.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1107761
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EXPLORING THE ROLE OF SUCCESSION PATTERNS IN CENTRAL AND EASTERN EUROPEAN'S DUALISTIC FARM STRUCTURES AgEcon
Schnicke, Hauke Joachim; Happe, Kathrin; Sahrbacher, Christoph; Kellermann, Konrad.
This paper analyses the interplay between farm adjustments on individual farms in dualistic farm structures over time using an agent-based simulation approach. In particular, explore the development of individual farms when there are off-farm work opportunities and different propensities of younger farm successors to take over the farm. Results show that despite of large numbers of individual farms leaving agriculture, the impacts on land use, production, and income are independent on different propensities to take over a farm.
Tipo: Conference Paper or Presentation Palavras-chave: Dualistic farm structures; Individual farms; Generation change; Succession; Farm Management; Institutional and Behavioral Economics.
Ano: 2008 URL: http://purl.umn.edu/6668
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Extinction Risk in Successional Landscapes Subject to Catastrophic Disturbances Ecology and Society
Boughton, David; Pacific Northwest Research Station, U.S. Forest Service; david.boughton@noaa.gov; Malvadkar, Urmila; Princeton University; malvadkr@princeton.edu.
We explore the thesis that stochasticity in successional-disturbance systems can be an agent of species extinction. The analysis uses a simple model of patch dynamics for seral stages in an idealized landscape; each seral stage is assumed to support a specialist biota. The landscape as a whole is characterized by a mean patch birth rate, mean patch size, and mean lifetime for each patch type. Stochasticity takes three forms: (1) patch stochasticity is randomness in the birth times and sizes of individual patches, (2) landscape stochasticity is variation in the annual means of birth rate and size, and (3) turnover mode is whether a patch is eliminated by disturbance or by successional change. Analytical and numerical analyses of the model suggest that...
Tipo: Peer-Reviewed Reports Palavras-chave: Biodiversity; Catastrophe; Dispersal; Disturbance; Extinction; Landscape; Metapopulation; Patch dynamics; Patchy population; Succession.
Ano: 2002
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Family Business Decision-Making: Factors and Influences on Choosing a Successor AgEcon
Foltz, Renee D.; Marshall, Maria I..
This paper investigates the factors that lead a family business to name a successor for the business, as the succession process often begins with naming a successor. We further separate family businesses into farm and non-farm businesses to compare and contrast the results. The factors used in the probit regression are clustered into three groups: business factors, family factors, and individual factors. Identifying the barriers that family businesses face when naming a successor will help Extension and other small and family business consulting agencies and organizations to formulate a guide to assist families when working through this process.
Tipo: Presentation Palavras-chave: Family business; Small farms; Succession; Agribusiness; Consumer/Household Economics; Farm Management.
Ano: 2012 URL: http://purl.umn.edu/124272
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Fine-root production in two secondary forest sites with distinct ages in Eastern Amazon Acta Amazonica
Lima,Tâmara Thaiz Santana; Miranda,Izildinha Souza; Vasconcelos,Steel Silva.
The objective of this work was to assess the fine-root (≤ 2 mm diameter) production dynamics of two forest regrowths at different ages. Fine-root production was monitored by the ingrowth core method in one 18-year-old site (2 ha) and one 10-year-old site (0.5 ha), both localized in the Apeú region, Northern Pará State, Brazil. The sites were abandoned after successive shifting cultivation, beginning in 1940. Monthly production of live fine-root was similar between sites and was influenced by rainfall seasonality, with higher production during the dry season than the wet season for mass and length. However, mortality in terms of mass was higher in the 10-year-old site than in the 18-year-old site. The seasonality influenced mortality only in the 18-year old...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Drought; Root biomass; Seasonality; Succession; Tropical forest.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672012000100012
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Functional patterns of tree communities in natural Araucaria forests and old monoculture conifer plantations Acta Botanica
Malysz,Marcelo; Müller,Sandra Cristina; Milesi,Silvia Vendruscolo; Santos,Anita Stival dos; Overbeck,Gerhard Ernst.
ABSTRACT A functional perspective of tree communities is helpful for understanding forest dynamics, especially vegetation recovery after other land uses. Knowledge about ecological filters and survival strategies of trees are also important for the restoration of degraded areas. This study aimed to evaluate the functional composition and structure of adult and regenerative components of natural Araucaria forests, Araucaria plantations and plantations of exotic Pinus in subtropical southern Brazil. Differences in functional diversity and functional richness, and in community weighted mean trait values, including leaf traits and reproductive traits, were analyzed. RLQ analysis was used to assess the association between community structure, plant traits and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Araucaria angustifolia; Atlantic Forest; Forest dynamics; Functional diversity; Functional patterns; Pinus sp.; Succession; Tree plantations.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000400777
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Inheritance Law and Investment in Family Firms AgEcon
Panunzi, Fausto; Ellul, Andrew; Pagano, Marco.
Entrepreneurs may be constrained by the law to bequeath a minimal stake to non-controlling heirs. The size of this stake can reduce investment in family firms, by reducing the future income they can pledge to external financiers. Using a purpose-built indicator of the permissiveness of inheritance law and data for 10,245 firms from 32 countries over the 1990-2006 interval, we find that stricter inheritance law is associated with lower investment in family firms, while it leaves investment unaffected in non-family firms. Moreover, as predicted by the model, inheritance law affects investment only in family firms that experience a succession.
Tipo: Working or Discussion Paper Palavras-chave: Succession; Family Firms; Inheritance Law; Growth; Investment; Financial Economics; G32.
Ano: 2009 URL: http://purl.umn.edu/50330
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Litter production and seed rain in semideciduous forest fragments at different successional stages in the western part of the state of Paraná, Brazil Acta Botanica
Toscan,Maria Angélica Gonçalves; Temponi,Lívia Godinho; Guimarães,Ana Tereza Bittencourt; Cândido Junior,José Flávio.
We documented litter production and seed rain in fragments of semideciduous forest (SDF) in the western part of the state of Paraná, Brazil: a late successional fragment (LF); an early successional fragment (EF); and a reforested late successional fragment (RLF). In each fragment, we established three permanent plots with four litter traps each, corresponding to 12 litter traps per fragment. Botanical material was collected monthly between June 2011 and May 2012. We sorted the material by category: leaves; branches; reproductive structures; and miscellaneous. We analyzed the seed rain using the reproductive structures. Annual production was highest (11,560 kg.ha-1) in the LF, followed by the RLF, with 9330 kg.ha-1, and the EF, with 7838 kg.ha-1. The RLF...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Litterfall; Semideciduous forest; Succession; Zoochory.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000300012
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Modeling Forest Succession among Ecological Land Units in Northern Minnesota Ecology and Society
Host, George; University of Minnesota - Duluth; ghost@sage.nrri.umn.edu; Pastor, John; Minnesota Department of Natural Resources; jpastor@nrri.umn.edu.
Field and modeling studies were used to quantify potential successional pathways among fine-scale ecological classification units within two geomorphic regions of north-central Minnesota. Soil and overstory data were collected on plots stratified across low-relief ground moraines and undulating sand dunes. Each geomorphic feature was sampled across gradients of topography or soil texture. Overstory conditions were sampled using five variable-radius point samples per plot; soil samples were analyzed for carbon and nitrogen content. Climatic, forest composition, and soil data were used to parameterize the sample plots for use with LINKAGES, a forest growth model that simulates changes in composition and soil characteristics over time. Forest composition and...
Tipo: Peer-Reviewed Reports Palavras-chave: Climatology; Dunes; Ecological classification systems (ECS); Forest growth model; Forest management; Forest; Succession; Geomorphology; LINKAGES; Moraines; Northern Minnesota; Overstory composition; Overstory composition; Soil properties..
Ano: 1998
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Modeling Succession on Irish Dairy Farms AgEcon
Hennessy, Thia C..
This paper examines intergenerational succession on Irish dairy farms. The factors that influence the decision to enter dairying farming are examined using a binary choice logit model. Reasons that are frequently published in the popular farming press as being an obstacle to intergenerational succession are analysed and the significance of their effect is quantified. Results show that the level of education of the heir is the most significant factor in the succession decision. Heir's with third level education are 30% less likely to enter dairy farming than their second level only educated counterparts. The sizes of milk quota and income that are associated with high probabilities of succession are identified.
Tipo: Conference Paper or Presentation Palavras-chave: Dairy Farming; Structural Change; Succession; Logit Model; Farm Management.
Ano: 2002 URL: http://purl.umn.edu/24953
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