Abstract:

In order to summarize and improve the methods of middle to large-scale land quality geochemical survey and evaluation, a pilot survey organized by the China Geological Survey was conducted in 2013 in Tangxi Town, Jinhua City, Zhejiang Province, a typical hilly-basin area at south China. Agricultural land was the main object of survey, and a sampling density test was conducted covering an area with several types of land-use. The survey area is approximately 90 square kilometers, and the sampling density varies from 9 to 16 points per square kilometer. Soil pH, soil environment quality, nutrient level, and soil quality were evaluated and graded based on elemental concentrations. The results indicate that soil pH is relatively low and about 90% of the survey area is acid-stage soil; nutrient elements in soils are not abundant, about 40% of the area is lack of nitrogen and potassium, 73% lack of phosphorus; soil environment quality is good and about 92.6% of the land is of high quality grade. Soil acidification and infertility are the main problems for the survey area. Therefore, it is urgent to take measures to neutralize acid soil and replenish fertilization. The sampling density should be increased so that the survey data can be directly used for land resource management at hilly-basin areas.

Key words: land quality, geochemical evaluation, hilly-basin area, Tangxi Town in Jinhua City, ZhejiangProvince