SPATIALIZATION OF FRACTIONS OF ORGANIC MATTER IN SOIL IN AN AGROFORESTRY SYSTEM IN THE ATLANTIC FOREST, BRAZIL

Silva, Camila Santos da; Pereira, Marcos Gervasio; Delgado, Rafael Coll; Assunção, Shirlei Almeida

doi:10.1590/01047760201723022318

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Articles • CERNE 23 (2) • Apr-Jun 2017 • https://doi.org/10.1590/01047760201723022318 copy

SPATIALIZATION OF FRACTIONS OF ORGANIC MATTER IN SOIL IN AN AGROFORESTRY SYSTEM IN THE ATLANTIC FOREST, BRAZIL

ESPACIALIZAÇÃO DAS FRAÇÕES DA MATÉRIA ORGÂNICA DO SOLO SOB UM SISTEMA AGROFLORESTAL, NA MATA ATLÂNTICA, BRASIL

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

This study aimed to spatialize fractions of organic matter of soil in an agroforestry system (AFS) located in the Atlantic Forest in Brazil. Thirty-one soil samples were collected at depths of 0-10, 10-20 and 20-40 cm from georeferenced collection points. We determined total organic carbon (TOC), particulate carbon (COp), carbon associated with clay and silt (COam), carbon content in the fulvic acid fraction (C-FAF), humic acid fraction (C-HAF) and humin fraction (C-HUM). Semivariogram analysis and model adjustment were carried out using ArcGIS 10.2 software. Subsequently, spatial interpolation was performed using Ordinary Kriging. We observed spatial dependence for all variables except for TOC and COp at the 0-10 cm depth, which presented a pure nugget effect. It was possible to observe modifications in the distribution of humic substances in the study area. The results from this study are similar to those of other studies conducted in naive areas in the Atlantic Forest, demonstrating the benefits of using the agroforestry system.

Keywords:
Labile fraction; Humic substances; Geostatistics; Soil quality indicators

UFLA - Universidade Federal de Lavras Universidade Federal de Lavras - Departamento de Ciências Florestais - Cx. P. 3037, 37200-000 Lavras - MG Brasil, Tel.: (55 35) 3829-1706, Fax: (55 35) 3829-1411 - Lavras - MG - Brazil
E-mail: cerne@dcf.ufla.br

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[1] * mgervasiopereira01@gmail.com

Variables	Mean	Median	SD⁽⁷⁾	CV⁽⁸⁾ (%)	Skewness	Kurtosis	W⁽⁹⁾
0-10 cm
TOC⁽¹⁾ (g.kg^-1)	21.28	21.21	7.11	33.43	-0.19	-0.34	0.98ns
COp⁽²⁾ (g.kg^-1)	5.80	5.42	1.46	25.21	0.51	-0.92	0.04*
COam⁽³⁾ (g.kg^-1)	15.68	14.74	6.14	39.16	-0.07	-0.83	0.64ns
C-FAF⁽⁴⁾ (g.kg^-1)	1.48	1.16	0.87	58.57	0.32	-1.35	0.02*
C-HAF⁽⁵⁾ (g.kg^-1)	1.52	1.41	1.01	66.42	0.75	-0.25	0.02*
C-HUM⁽⁶⁾ (g.kg^-1)	8.71	8.96	3.40	39.10	0.34	0.42	0.79ns
10-20 cm
TOC (g.kg^-1)	13.62	12.42	4.19	30.73	0.79	0.23	0.10ns
COp (g.kg^-1)	4.13	3.92	0.99	24.10	0.83	0.43	0.09ns
COam (g.kg^-1)	9.49	7.95	3.62	38.13	0.69	-0.59	0.02*
20-40 cm
TOC (g.kg^-1)	9.54	9.00	2.82	29.59	1.15	2.57	0.03*
COp (g.kg^-1)	3.33	3.30	0.68	20.50	0.08	-0.51	0.96ns
COam (g.kg^-1)	6.21	5.81	2.76	44.43	1.16	2.77	0.02*

Variables	R⁽⁷⁾	R²⁽⁸⁾	d⁽⁹⁾	SEE⁽¹⁰⁾	RMSE⁽¹¹⁾	DSD⁽¹²⁾ (%)	Class	Model
	0-10 cm
TOC⁽¹⁾ (g.kg^-1)	-0.18	0.03	0.44	1.30	1.01	DSD⁽¹²⁾ (%)	Class	Model	100.00	PNE⁽¹³⁾	-
COp⁽²⁾ (g.kg^-1)	0.22	0.05	0.55	0.08	0.98	100.00	PNE	-
COam⁽³⁾ (g.kg^-1)	0.18	0.03	0.54	1.94	0.96	75.07	Weak	Exponential
C-FAF⁽⁴⁾ (g.kg^-1)	0.77	0.60	0.76	0.16	0.75	21.00	Strong	Exponential
C-HAF⁽⁵⁾ (g.kg^-1)	0.52	0.27	0.69	0.38	0.99	31.58	Moderate	Spherical
C-HUM⁽⁶⁾ (g.kg^-1)	0.52	0.27	0.66	1.55	0.93	12.43	Strong	Spherical
	10-20 cm
TOC (g.kg^-1)	0.44	0.19	0.56	1.65	0.99	12.43	Strong	Spherical	28.04	Moderate	Exponential
COp (g.kg^-1)	0.47	0.22	0.65	0.49	0.97	55.79	Moderate	Gaussian
COam (g.kg^-1)	0.37	0.13	0.64	0.17	0.95	71.05	Moderate	Exponential
	20-40 cm
TOC (g.kg^-1)	0.38	0.14	0.53	0.98	0.99	71.05	Moderate	Exponential	37.57	Moderate	Exponential
COp (g.kg^-1)	0.51	0.26	0.55	0.34	0.94	20.58	Strong	Exponential
COam (g.kg^-1)	0.63	0.40	0.66	0.95	1.01	6.29	Strong	Exponential