Study on Soil and Water Loss and Dynamic of Soil Water of Citrus Orchards in Demonstration Area of Environmental Migrants,Northwest Guangxi

Monitors of 3 years' continuous orientation were made on soil and water loss of 2 types citrus orchards of setting up the orchards modes, and studies were made on the contents of soil changes in a year from 4 types citrus orchards in the Northwest of Guangxi. The result showed that soil and water loss amounts of 2 types citrus orchards of setting up the orchards modes decreased little by little annually, and the run off coefficient of non-terraced citrus orchards was higher than that of terraced citrus orchards; the moisture contents in soil were related with soil profile, setting up the orchards mode and parent rock deriving the soil. Generally, the contents of moisture in the soil were closely related with monthly precipitation. The moisture contents of different month were different, so different management technologies on fruit tree were adopted.