Carbon and nitrogen stocks of soils under different land uses in Pernambuco state, Brazil.

Acrisols, Ferralsols, Leptosols and Planosols were sampled in layers down to 1 m under dense caatinga, open caatinga, pasture and agriculture. Agricultural Leptosols and Planosols had the lowest C and N concentrations among the land uses, although in some cases differences were not statistically significant. On average, conversion of dense caatinga to agriculture reduced C stocks from63 to 47 Mg ha?1. Acrisols had the highest concentrations of C and N, and Planosols had the lowest concentrations and stocks. Conversion to pasture did not reduce stocks, but open caatinga also had lower C stocks (50 Mg ha?1) than dense caatinga. Nitrogen stocks did not differ among land uses, implying that losses are greater for C than for N. Despite the fact that the western portion of Pernambuco state covers 3% of the Brazilian semi-arid area, it stocks about 0.20 Pg of C (and 0.019 Pg of N), which represents 2% of the total estimated soil C stock in the semiarid region (8.9 Pg). Therefore, the stock per hectare in the west portion of Pernambuco is about one-third smaller than the stock per hectare in the whole Brazilian semiarid region, probably a consequence of the lower average C concentration in the 20 cm superficial layer, a higher proportion of agricultural fields and shallower depths of some soil classes inwestern Pernambuco than in the whole semiarid region.

Bibliographic Details

Main Authors:	SANTANA, M. da S., SAMPAIO, E. V. de S. B., GIONGO, V., MENEZES, R. S. C., JESUS, K. N. de, ALBUQUERQUE, E. R. G. M. de, NASCIMENTO, D. M. do, PAREYN, F. G. C., CUNHA, T. J. F., SAMPAIO, R. M. B., PRIMO, D. C.
Other Authors:	MÔNICA DA SILVA SANTANA; EVERARDO VALADARES DE SÁ BARRETTO SAMPAIO; VANDERLISE GIONGO, CPATSA; RÔMULO SIMÕES CEZAR MENEZES; KENNEDY NASCIMENTO DE JESUS; ELIZA ROSÁRIO GOMES MARINHO DE ALBUQUERQUE; DIEGO MARCELINO DO NASCIMENTO; FRANS GERMAIN CORNEEL PAREYN; TONY JARBAS FERREIRA CUNHA, CPATSA; RAQUEL MENEZES BEZERRA SAMPAIO; DÁRIO COSTA PRIMO.
Format:	Artigo de periódico biblioteca
Language:	English eng
Published:	2019-02-19
Subjects:	Estoque de carbono, Semiárido, Leptossolos, Profundidade do solo, Pernambuco, Solo, Uso da Terra, Nitrogênio, Acrisols, Ferralsols, Planosols, Soil,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1106235
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