Análise espacial do carbono em um fragmento florestal com predominância de Anadenanthera sp.

Abstract

The spatial analisys of an attribute is important to provide support for decisions related to its management. Therefore, the focus of this study is to spatially analyze the biomass, carbon content and carbon stock in the stem, root and soil in an Anadenanthera sp. predominating forest fragment. Chapter 1 consists of a literature review of Anadenanthera sp. issues, intensification of the greenhouse effect and institutional measures to reduce greenhouse gases, importance of forest ecosystems as CO2 sinks, methods of quantification of biomass and carbon, the study of carbon in the stems, roots and soil, and geostatistics. Chapter 2 refers to a geoestatistic study conducted on the carbon stock in the stem of Anadenanthera sp., which is obtained in a non-destructive way by means of regression models and the ratio wood density and stem relative volume. Results showed an existing spatial dependence for this variable, but due to the occurrence of data overdispersion there is a need for a more detailed sampling in the area. Chapter 3 includes the study of the biomass spatial distribution, carbon content and carbon amount in roots collected from central points within sampling units sistematically selected at four different depths. The absence of spatial dependence as well as the semivariogram models adjustments with and without level for both the variables and the depths studied was noticed. Chapter 4 aims at studying the spatial dependence of both carbon content and carbon stock in the soil at four different depths. Soil samples were collected from the same sampling root points. A decreasing gradient in both carbon content and carbon stock was noticed from the surface to the other depths. There was no spatial dependence for the variables studied and the adjustment of semivariogram models with and without landing was performed, allowing the building of kriging prediction maps.