Data/hora: 17/06/2024 03:52:11

Biblioteca(s): 	Embrapa Acre.	
Data corrente: 	11/01/2008	
Data da última atualização: 	28/07/2021	
Autoria: 	KAINER, K. A.; WADT, L. H. de O.; STAUDHAMMER, C. L.	
Afiliação: 	K. A. Kainer, University of Florida; LUCIA HELENA DE OLIVEIRA WADT, CPAF-AC; Christina L. Shaudhammer, University of Florida.	
Título: 	Explaining variation in Brazil nut fruit production.	
Ano de publicação: 	2007	
Fonte/Imprenta: 	Forest Ecology and Management, United Kingdom, v. 250, n. 3, p. 244-255, Oct. 2007.	
DOI: 	10.1016/j.foreco.2007.05.024	
Idioma: 	Inglês	
Conteúdo: 	Brazil nut is widely recognized as the cornerstone of the Amazonian extractive economy. Tight linkages between Brazil nut production, regional income, and intact mature forests have thrust this species into focus as a key component of Amazonian conservation and income generation strategies. Nonetheless, a comprehensive synthesis of factors explaining Brazil nut fruit production variation is lacking. We aimed to address this knowledge gap, asking: (1) What are the rates and annual variation of Bertholletia excelsa fruit production at individual and population levels? (2) What factors explain B. excelsa production variation, focusing on spatial and temporal variables, diameter at breast height (dbh), crown attributes, liana loads, and soil attributes? and (3) Does liana cutting affect fruit production? Our model explained 73% of the variability in fruit production by 140 trees over 5 years. Dbh alone explained >50%, and trees in the middle diameter range (100 cm ? dbh < 150 cm) produced best. Top-producing trees were loosely grouped spatially. Cation exchange capacity and P also explained production variation. The liana load variable was only weakly significant for explaining production variation, and there were no direct significant effects of liana cutting. Cutting, however, did improve crown forms?another highly significant model variable. This, coupled with a weakly significant interaction of liana cutting by year, suggests that liana cutting could improve production over time. In any given year, approximately 25% of the trees produced 72% of the total population production. Annual variation of fruit production at the individual level was relatively high, and at the population level was extremely low, with annual production departing from average only in a year of delayed and reduced rainfall. These results coupled with low synchronicity of fruiting, confirm long-term observations of harvesters that Brazil nut populations exhibit relatively constant fruit production. Results suggest that fruit productivity at the individual tree level could be increased, possibly through experimental liana cutting and/or P amendments. At the population level, Brazil nut collectors could potentially increase efficiency by concentrating collection efforts on consistently high producers and possible production "hotspots".	
Palavras-Chave: 	Castanha do brasil; Economía de la producción; Nuez del Brasil; Productos forestales no madereros; Produto florestal não madeireiro (PFNM); Variação da produção.	
Thesagro: 	Bertholletia excelsa; Castanha do pará; Produtividade.	
Thesaurus Nal: 	Brazil nuts; Nontimber forest products; Production economics.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
Registro original: 	Embrapa Acre (CPAF-AC)	
Exemplares: 	CPAF-AC - (16791-1) - UPC - AP - PP - SP 188 -  - 2008.00089 - DES
CPAF-AC - (16791-2) - UPC - AP - DD -  -  -  - DIS