Abstract:

The temporalspatial distribution of cultivated land quality had brought about great changes under inducement by human activities. Studies on the process of cultivated natural quality alteration to economic quality could expand research connotation of land quality.Taking Hechuan City in Chongqing for example,patch data based on agricultural land classification and gradation and influence coefficient were used to obtain adjusted quality indices.Influence coefficient was used to modify natural quality index based on the investigation to households,and this influence coefficient made adjusted quality indices economization.It turned out that the farmers’ inputoutput made cultivated land natural quality reduced.Meanwhile,spatial autocorrelation analysis was used to reflect the spatial agglomeration of farmland by GeoDA.The results showed that modified quality grades reduced compared with natural quality grades;the distribution of adjusted quality grade of paddy land and dry land had remarkable positive correlation in space.That is to say,high quality paddy field was adjacent to high quality paddy field,and also low quality paddy field was adjacent to low quality paddy field.The distribution of dry land also followed the same rule,and concentration phenomenon was obvious.