Long term soil positioning observation dataset at Helen Station (2005, 2010, 2015)

a. Data content (data file/table name, including observation index content) The long-term soil positioning observation dataset of Hailun Station (2005, 2010, 2015) reflects the soil conditions of farmland in Hailun City, Heilongjiang Province, including multiple indicators such as soil exchange capacity, soil nutrients, mechanical composition, and bulk density. b. Construction purpose Mainly used for monitoring the dynamic changes of the national farmland ecosystem and researching related aspects of agricultural ecology. c. Service object National policy makers, students and researchers engaged in related research, management and teaching personnel, etc. d. Time range of data 2005, 2010, 2015 e. The spatial range of data National Field Science Observation and Research Station of Heilongjiang Hailun Agricultural Ecosystem in Hailun City, Heilongjiang Province