The research on the evaluation of agricultural land in Guizhou karst areas——With a special reference to Huajian canyon area

The research on the evaluation of agricultural lands in karst areas is still in its initial stage, and its basic theories and method systems have not been established. At present, evaluation of agricultural land being carried out in the karst rural areas includes the single house-base evaluation, city- suburb combination or city-planning area land evaluation, and the single land evaluation to resolve the disputing problems. There are some difficult problems, such as the classification of agricultural land and the availability of the evaluation means. With the study, it is beneficial to improve the theories and methods of evaluation of agricultnial land in the whole karst and non-karst areas as well.