Perdas de carbono e nitrogênio por erosão em diferentes usos e ocupação do solo sob chuva natural em região de transição Cerrado-Amazônia

Abstract

Water erosion is the most serious form of soil degradation, as it causes the loss of soil and nutrients through the runoff. These losses are influenced directly by the soil cover, in this sense, an experiment was elaborated to quantify and study the behavior of the loss of soil and nutrients in several treatments, in relation to the presence of soil cover. The experimental plots were implanted in five different land uses and coverages in the Embrapa Agrossivilpastoril area, in Sinop / MT, respectively: Pasture, a system with crop and forest integration (ILF), an area planted with Eucalyptus, soy and corn succession and Soil without cover, in which the sediments were retained and submitted to natural drying, after which the analyzes of the carbon and nitrogen contents were analyzed in a CHNS analyzer. It was verified that the treatments that presented the highest losses of soil were those that presented higher losses of total nitrogen (N) and organic carbon (C). The highest total losses of Nitrogen and Carbon were, in decreasing order: SSC> Tillage> Eucalyptus> iLF> Pasture. The higher losses of Nitrogen and Carbon are associated to the high amount of organic material coming from the vegetal cover present in the plots.