Influence of Land Use Changes and Land Use Practices on Soil Quality at Labouya Village, Sanean Subdistrict, Muang District, Nan Province
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Abstract
The soil quality of various land use types was examined through evaluation of its different properties as indicators. Soil samples were collected from 30 locations representing 4 different land use types, e.g. secondary forest (SCF), fruit tree (FT), fallow area (FA) and mixed crop (MC) and were then analyzed for their chemical and physical properties. Results showed that the change of land use in the highland from secondary forest into different kinds of cultivation area, indicated much finer soil texture. Soil bulk density (Bd) was significantly low in no-cultivated soil. For pH values, results indicated that cultivated soil were significantly lower than SCF and FA areas. Additional results showed that soil organic matter content (OM) in cultivated areas was lower than in SCF because the accumulation was lower than its decomposition.
Furthermore, results of the study showed that cation exchange capacity (CEC) in cultivated soil tended to be lower than in SCF, and especially in MC. Similarly, total nitrogen was significantly low in cultivated soil particularly in FT but in FA, available phosphorous was found to be significantly higher than the other land use types. Meanwhile in FA, exchangeable K, Ca and Mg were highest as compared to other land use types. In this study, however, permanganate oxidizable carbon (POC) was highest in MC, there was no reaction in POC from the change in land use. As for soil electrical conductivity (EC), the lower values were found in cultivated areas.
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