Carbon and Nitrogen Stocks and Microbiological Activity Under Forest-Pasture System and Traditional Pasture in Pernambuco

Pessôa, Gabriel Carlos Moura; Piscoya, Victor Casimiro; Rolim Neto, Fernando Cartaxo; Araújo Filho, Renisson Neponuceno de; Melo, Robson Carlos Pereira de; Pessôa, Uriel Calisto Moura; Silva, Lucas José de Souza; Cunha Filho, Moacyr; Almeida, Rafael Costa Schaidhauer de; Piscoya, Thaisa Oliveira Folha; Moraes, Alex Souza; Gomes Filho, Raimundo Rodrigues; Medeiros, Raimundo Mainar de; Saboya, Luciano Marcelo Fallé; Pedrotti, Alceu; Holanda, Francisco Sandro Rodrigues; Fernandes, Milton Marques; Santos, Luiz Diego Vidal

doi:10.1590/2179-8087-FLORAM-2021-0068

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ORIGINAL ARTICLE, Silviculture • Floresta Ambient. 29 (2) • 2022 • https://doi.org/10.1590/2179-8087-FLORAM-2021-0068 copy

Carbon and Nitrogen Stocks and Microbiological Activity Under Forest-Pasture System and Traditional Pasture in Pernambuco

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

An adequate amount of soil organic matter is considered essential for long-term sustainable agriculture, ensuring good productivity. Therefore, the present study quantified carbon and nitrogen stocks and microbiological activity in soil of three different areas: Forest-pasture System, Pasture System and preserved Caatinga - used as a reference of the experiment - located in a semi-arid region, in Watershed of Pajeú River, state of Pernambuco, Brazil. Eight trenches were opened in each system to collect soil samples at depths of 0 - 10, 20 - 30 and 50 - 60 cm, for chemical and microbiological analysis. In general, attributes of soil showed better results of land use in the following order: preserved Caatinga - Forest-pasture System - Pasture System.

Keywords:
Fractionation of humic substances; Carbon stocks; Agroforestry Systems; Caatinga

Systems	TCStock	TNStock	>	>C/N
Systems	Mg ha^-1		>	>C/N
Depth 0 - 10 cm
PS	10.73 Ca	0.90 Ba		11.85 Aab
CS	25.3 Aa	2.16 Aa		11.72 Aa
FPS	12.98 Ba	1.10 Ba		11.78 Aa
Depth 20 - 30 cm
PS	9.42 Cab	0.77 Bab		12.21 Aa
CS	18.71 Ab	1.62 Ab		11.51 Aa
FPS	11.04 Bab	0.93 Bab		11.78 Aa
Depth 50 - 60 cm
PS	7.88 Bb	0.70 Bb		11.32 Ab
CS	12.69 Ac	1.08 Ac		11.75 Aa
FPS	9.5 Bb	0.81 Bb		11.68 Aa

	Carbon Stocks
>Systems	CLOM		FACStock	HACStock	HFCStock	LCStock
>Systems		Mg ha^-1	Mg ha^-1
	Depth 0-10 cm
PS	0.21 Ca		1.18Ba	1.71Ba	3.65Ba	1.07 Ba
CS	0.5 Aa		2.27Aa	5.05Aa	11.13Aa	2.78 Aa
FPS	0.25 Ba		1.29Ba	1.81Ba	4.54 Ba	1.29 Ba
	Depth 20-30 cm
PS	0.18 Bab		1.03Bab	1.51Bab	3.20Bab	0.94Bab
CS	0.37 Ab		1.68Ab	3.74Ab	8.23Ab	2.05Ab
FPS	0.20 Bb		1.10Bab	1.54Bab	3.86Bab	1.10Bab
	Depth 50-60 cm
PS	0.15 Bb		0.86Bb	1.26Bb	2.68Bb	0.78Bb
CS	0.23 Ac		1.14Ac	2.53Ac	5.58Ac	1.39Ac
FPS	0.17 Bb		0.94Ab	1.33Bb	3.33Bb	0.95Bb

Systems	MBC	BR	qCO2	qMIC
	mg kg^-1 C	mg kg^-1 h^-1 C-CO2	mg kg^-1 h^-1	%
	Depth 0 - 10 cm
PS	133.10 C	0.23 C	1.68 A	1.76 C
CS	425.54 A	0.68 A	1.72 A	2.20 A
FPS	189.33 B	0.35 B	1.86 A	2.00 B

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E-mail: floram@ufrrj.br

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