Relações solo-paisagem associadas aos usos agrícolas no município de Martins – RN

Abstract

The absence of plant diversity in agricultural cultivation systems is as extensive and alarming rate of soil degradation. In this context, the research aimed to evaluate the physical and chemical properties of the soil in relation to landscape and agricultural uses to detect which of these attributes were the most sensitive in distinguishing environments. The research was conducted in the city of Martins / RN on site Bela Vista. To characterize the environment in study opening was held three representative profiles and collected soil samples to the diagnostic horizons for physical and chemical analysis of the soil and subsequently classification. six areas were studied: maize consortium, beans and cassava (CON); monoculture of sugarcane (CAN); banana monoculture (BN); monocultures of elephant grass (CE); corn monoculture (MM) and native vegetation as reference (MN). For the study of areas, collected by 6 samples derived from compound 15 replicates for each area mentioned above, the deformed structure with layers of 0.00 to 0.10; 0.10-0.20 and 0.20-0.30 m in order to perform analyzes of the physical and chemical soil. Analyses were performed in the laboratories of Physics and Soil Fertility of the Federal Rural University of Semi-Arid. The textural classification of soils in cultivation environments textural rating ranged Characterizing the environments in profiles as textural rating ranged from sandy clay, clay, and clayish, with pH ranging from acid neutralidade.Verificou low concentrations of exchangeable cations, consequently low base saturation, considered dystrophic. As for agricultural use followed the same trend as fertility, and the grass area elephant showed higher structural quality. The soils were classified in Fluvisols in the fields of sugar cane and elephant grass, consortium, banana and corn and Udorthent the native forest. Textural classification in soil profiles varied from sandy clay, the clay (Neossolos Fluvic), clayey to very clayey (Fluvisol) and sandy clay (Udorthent). Fertility on farming uses showed acidity reactions to the natural forest areas (MN); and Consortium (CON), tending towards neutrality for elephant grass (CE), corn (MM) and Banana (BAN), with the presence of Al3 + and H + Al and without high salinity. The largest Total Organic Carbon (COT) content was in agricultural use of elephant grass (CE) and the consortium (CON) which favored the largest aggregation and aggregate stability in the soil is influenced by soil-landscape relationship. By means of the main components of multivariate analysis demonstrated that some of the chemical characteristics (pH, Ca2+, Mg2+ Sum bases, T, V, CE, Na + and PST were indicators of separation environments). However the most sensitive were (Al 3+, H-Al)