Regional arable land consolidation based on agricultural land classification and gradation

Delineating arable land consolidation (LC) zones and the degree of priority zones is the basic work for LC planning. Taking Daxing district in Beijing as an example, the factors were chosen for arable LC zoning based on LC targets, and the fuzzy cluster were used for zoning LC types. Based on the dual-objectives, that are the LC benefits and the press for increasing arable land area and improving integrated production abilities, the evaluation factors and methods to determine the priority degree of LC were studied. The results show that: 1) the most serious restrictive factor is the lowest soil fertility, and the area of arable land which is urgent to cultivate the fertility is 27 603.8 hm2, occupying 64.9% of the total arable area in this region; 2) the bad production conditions caused by the unsuited gradient, little scale and irregular shape of arable land parcel is the second serious restrictive factor, and the area needed to implement consolidate project is 17.86% of the total arable area in this region; 3) the near LC zones is consistent in distribution with the area related with consolidation to increase arable land area, occupying 15.82% of the total arable area in this region, metaphase LC area occupying 46.18% distributes convergent and continuously in the northern Daxing, and the targets of LC in the long-term LC area is to increase arable land area by consolidating the rural residential area and unused land, while the main measurement is to maintain and cultivate soil fertility in a long term. The results can provide scientific instructions for regional arable LC planning and practice.