Temporal-spatial Analysis of Stocks of Carbon Acrisols and Different Land-use in Brazilian Amazon

Joiada Moreira da Silva Linhares¹, Wanderley Rodrigues Bastos¹, Ronaldo Almeida¹, Ângelo Gilberto Manzantto¹, Déborah Pereira Linhares da Silva², Ercivan Gomes de Oliveira³, andAdorea Rabello da Cunha Albuquerque³

1. Laboratory of Environmental Biogeochemistry Wolfgang C. Pheiffer, Federal University Rondônia (UNIR), Brazil

2. Institute of Education Science and Technology of Rondônia (IFRO), Cacoal, Brazil

3.Federal University of Amazonas (UFAM), Manaus, Brazil

Abstract: The term land-use describes the different forms land is employed and occupied. In rural environments, an agroforestry system (AFS) is any land-use method that is a source of income and food to households and can help reduce anthropogenic carbon emissions to the soil caused by change in land-use. This study analyzed the spatial variability of organic carbon stocks (OCS) and organic carbon levels (OCL) in soils exposed to different use and cover practices in a rural settlement in the southern Amazon in Brazil. Images were digitally processed and a theme map was constructed. Then quadrats were defined and soil samples were collected. AFSs established for over 10 years (AFS19 and HG15) presented the highest soil OCS (21.02 mg C/ha and 18.86 mg C/ha) in the 0-10cm layer in the rainy season. The lowest soil OCS (2.58 mg C/ha) was recorded in migratory agriculture quadrats. AFSs established for longer periods induced an increase in soil OCS and the recuperation of the chemical attributes of soil.

Key words: change land-cover, stocks of carbon soil, agroforestry systems