Data/hora: 25/09/2024 13:36:12

Biblioteca(s): 	Embrapa Semiárido.	
Data corrente: 	05/05/2017	
Data da última atualização: 	18/01/2018	
Autoria: 	SILVA, A. F. da; FREITAS, A. D. S. de; COSTA, T. L.; FERNANDES JUNIOR, P. I.; MARTINS, L. M. V.; SANTOS, C. E. de R. e S.; MENEZES, K. A. S.; SAMPAIO, E. V. de S. B.	
Afiliação: 	ALEKSANDRO FERREIRA DA SILVA, Universidade Federal Rural de Pernambuco; ANA DOLORES SANTIAGO DE FREITAS, Universidade Federal Rural de Pernambuco; TANIA LUCIA COSTA, Universidade Federal Rural de Pernambuco; PAULO IVAN FERNANDES JUNIOR, CPATSA; LINDETE MIRIA VIEIRA MARTINS, Departamento de Tecnologia e Cieˆncias Sociais, Universidade do Estado da Bahia, Juazeiro, BA; CAROLINA ETIENNE DE ROSALIA E SILVA SANTOS, Universidade Federal Rural de Pernambuco; KELLY ALEXSANDRA SOUZA MENEZES; EVERARDO VALADARES DE SA BARRETTO SAMPAIO, Departamento de Energia Nuclear, Universidade Federal de Pernambuco.	
Título: 	Biological nitrogen fixation in tropical dry forests with different legume diversity and abundance.	
Ano de publicação: 	2017	
Fonte/Imprenta: 	Nutrient Cycling in Agroecosystems, v. 107, n. 3, p. 321-334, 2017.	
DOI: 	10.1007/s10705-017-9834-1	
Idioma: 	Inglês	
Conteúdo: 	Tropical dry forests have high diversity and plant abundance of potentially biologically nitrogen fixing (BNF) legume species, attributed to the ecological advantage of fixation. However, there are few estimates of N quantities annually fixed, hindering the understanding of factors that control BNF, like low phosphorus availability. The quantities of N fixed in three dry forest (caatinga) fragments of the semiarid Brazilian northeastern region with different legume plant proportions were determined and seedlings of Mimosa tenuiflora were grown with phosphorous fertilized soil from the fragments to verify if lack of fixation was due to the absence of rhizobia populations or P deficiency. The vegetation of all areas was dominated by legume plants, mainly potentially nodulating ones, despite the relatively high soil N availability. M. tenuiflora was the most abundant nodulating legume in all fragments, with annual leaf productions from 800 to 1400 kg ha - 1 . BNF amounts were low (1.4, 18 and 3.6 kg ha - 1 year 1 in the mature caatinga of Petrolina and in the mature and regenerating caatingas of Sa ? o Joa ? o, respectively) considering the high proportions of potentially nodu- lating plants (33, 61 and 82% of total plant basal area), because 80, 10 and 70% of these plants were not fixing and those fixing had only 20?46% of their N derived from the atmosphere. Since the pot grown seedlings nodulated abundantly, the low BNF could not be explained by absence of microsymbionts but likely to low symbiosis efficiency due to relatively high N and low P availability.	
Palavras-Chave: 	Biomassa foliar; Fixação biológica de nitrogênio; Leaf biomass; Natural abundance; Semiárido.	
Thesagro: 	Floresta; Floresta tropical; Rhizobium.	
Thesaurus Nal: 	Symbiosis.	
Categoria do assunto: 	X Pesquisa, Tecnologia e Engenharia	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/159576/1/Paulo-Ivan-2017.pdf	
Registro original: 	Embrapa Semiárido (CPATSA)	
Exemplares: 	CPATSA - (56583-1) - UPC - AP - DD -  -  -  - DIS