Framework of the arable-land quality dynamic monitoring sites through national gathering of standard farmland

The study areas are limited in the following nine provinces of central China. Heilongjiang, Jilin, Liaoning, Shanxi, Henan, Anhui, Hunan, Hubei and Jiangxi, and the main data sources are based on the results of provincial gathering of arable land classification. It is the first time that the results of national gathering of standard farmland, and the arable-land quality dynamic monitoring have been combined. Moreover, this paper puts forward the preliminary discussion about the arable-land quality dynamic monitoring sites selection based on the national gathering of standard farmland establishes the database of the central nine provinces gathering of standard farmland, and analyzes the distribution of standard farmland, according to different grades and different secondary regions. On these bases, after selecting the arable-land quality dynamic monitoring sites on standard farmland, the authors provide some referential advice for the system of standard farmland.