Spatial Distribution Characteristics of pH Value and Organic Matter Content in Farmland Soil and Influencing Factors in Changsha County
In order to understand the abundance and spatial distribution characteristics of organic matter in farmland soil in Changsha County,2 118 soil samples from farmland(0-20 cm)in Changsha County were collected.The pH value and organic matter content in soil were measured,and the effects of different parent rock materials,soil texture,and land use methods on pH value and organic matter content in soil were analyzed.The results show that the farmland soil in Changsha County is mainly slightly acidic,with stronger acidity observed in the central and northern parts of the farmland soil.The organic matter content in soil is relatively high,showing a distribution trend of high in the north and low in the south.Among different parent rock materials,only the soil developed by sandstone weathering is acidic,and the soil formed by other types of parent rock materials is slightly acidic.The average organic matter content in soil ranges from 27.2 to 38.3 g/kg.Among different soil textures,the mean pH value of light soil is the highest(6.3),and that of sand soil is the lowest(5.5).The organic matter content in descending order is light soil>sandy soil>medium soil>clay>heavy soil.Among different land use methods,the average pH value and organic matter content of paddy fields are 5.92 and 34.2 g/kg,respectively.The average pH value and organic matter content of dry land are 5.89 and 30.5 g/kg,respectively.
pH value in soilorganic matter in soildistribution characteristicsinfluencing factorsChangsha County
NETL
NSTL
万方数据
