中国土壤数据库使用说明（Instructions for use of soil databases in China）.docVIP

中国土壤数据库使用说明（Instructions for use of soil databases in China） Instructions for use of soil databases in China I. brief introduction of database contents Soil is the most important natural resource of a country, and it is the material base of agricultural development. Authoritative publications with independent copyright based soil database Chinese, some research projects hosted by Nanjing soil data and research Chinese ecosystem network land ecological station monitoring data as data source. The above data are under the unified planning of the state and the Chinese Academy of Sciences, organized nationwide. The soil database of China is divided into 11 sub databases, including: China soil database of the second national soil survey data of more than 2000 typical soil profiles and the profile statistics based on survey data, and establish the location and soil classification and Soil Association, according to the location and soil classification retrieval. China soil thematic map library according to the data of national soil survey summary 64 1:100 10000 soil map, established 1:100 000 soil spatial database, can retrieve the main soil types in China, distribution area, soil classification and typical profile name. 5 soil thematic data sets are generated by establishing a point surface combination and extension model. The data type is image or vector data. Long term test database of nutrient cycling, Chinese Academy of Sciences, since 90s, has conducted a network study on long-term trials of nutrient cycling in farmland ecosystem using the China Ecosystem Research Network Agricultural Station as a platform. This database collects some results and data of this research. The farmland soil environmental status database contains 2005 environmental status data of soil China main farmland ecosystem, covering data of main soil types in Northeast China black soil, brown soil, fluvo aquic soil, sandy soil, cinnamon soil, paddy soil, red soil, Huang Miantu, dark loessial soil,