Research on Priority Zones Identification of Cultivated Land Fallow by Coupling Spatial Trade-off Decision and Connectivity:A Case Study of Hannan District,Wuhan City
The purposes of this study are to establish a scientific method for identifying priority zones of cultivated land fallow,and to solve the problems in the existing selection style of cultivated land fallow characterized by administrative task-based indicators,such as fuzzy selection criteria for selected fallow patches,singular selection technique,and fragmented spatial forms. The research methods are as follows. Taking Hannan District of Wuhan City as the study area,this study firstly integrates the evaluation model for the main control factors of cultivated land fallow and the three-dimensional magic cube model to develop a spatial trade-off decision model to diagnose objects of cultivated land fallow.Then,based on the seed search algorithm and NRCA model,the identification model of cultivated land fallow priority zones is constructed. Finally,the two models are coupled into the technical framework of "object selection,scale constraint and continual subdivision" to diagnose and pinpoint the cultivated land fallow zones. The research results show that:1) the urgency of cultivated land fallow in spatial trade-off decision model is mainly "urgent" and "relatively urgent",and the spatial distribution shows the coexistence of centralized contiguous distribution and sporadic spot distribution. 2) There are eleven priority zones for cultivated land fallow,accounting for 15.89％ of the total cultivated land area in Hannan District. Compared with the original spatial distribution of fallow urgency under the same fallow scale,the number and the unit area of cultivated land fallow patches decreases by 30.23％ and increases by 36.74％,respectively. The Landscape Shape Index and Edge Density decrease by 22.75％ and 20.9％,respectively. 3) Three fallow priority zones controlled by cultivated land use intensity,cultivated land health status and cultivated land productivity potential are identified,accounting for 14.68％,11.95％ and 73.37％,respectively. The fallow model and management suggestions are put forward for the above three fallow priority areas,accordingly. In conclusion,based on the problem-oriented identification of cultivated land fallow priority zones,this study realizes the practical policy needs of scientific selection of cultivated land fallow and "concentrated connectivity" in cultivated land fallow zones,and provides the policy references for the precise implementation of cultivated land fallow to achieve sustainable cultivated land use and national food security.
technology framework of cultivated land fallow diagnosiscultivated land system healthycultivated land use intensitycultivated land productivity potentialalgorithm of seed expansion area search
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