Abstract
Based on TOPSIS-Grey Relational Analysis Method, the three dimensions of cultivated land quantity, quality and ecological danger are organically integrated to build a comprehensive evaluation indicator system of practical and national cultivated land resources and quantitative calculation method by taking the province-level administrative region as the evaluation unit. The index of cultivated land quantity, quality, and ecological danger and the comprehensive index of cultivated land resources are calculated quantitatively in 31 province-level administrative regions of China. The comprehensive endowment and superiority of cultivated land resources in each province are also analysed systematically. The results show that there are 10 provinces (municipalities directly under the Central Government and autonomous regions) classified as “high superiority” provinces in terms of cultivated land resources. There are 9 provinces classified as “relatively high superiority” provinces. The dominant types of cultivated land resources in China can be classified into six types: superiority type of quantity, superiority type of quantity and ecology, superiority type of quality and ecology, superiority type of ecology, comprehensive superiority type, and unclear superiority type. Most provinces have a certain “single superiority”, “double superiority”, or “comprehensive superiority”.
Highlights
The ancient Chinese sayings “all things are born in the soil” and “where there is soil, there is grain”, which profoundly reveal the close relationship between cultivated land resources and food security
The most representative is the land capability classification system issued by the United States Department of agriculture [2] (1961) for servicing land protection, land suitability evaluation system formulated by FAO [3] (1976) and modern information system technology was used to predict crop yield in large regions by FAO [4] and dumanski [5], which are widely used in land resource investigation, land suitability evaluation, cultivated land quality classifying and grading in the world
3.1 Quantitative Comprehensive Evaluation Results of Cultivated Land Resources According to the above comprehensive evaluation method of cultivated land resources based on the TOPSIS-Grey Relational Analysis Method, the index of farmland quantity (IFQ1), index of farmland quality (IFQ2), index of ecological danger (IED), and comprehensive index of farmland resource (CIFR) of 31 provinces are calculated (Table 2)
Summary
The ancient Chinese sayings “all things are born in the soil” and “where there is soil, there is grain”, which profoundly reveal the close relationship between cultivated land resources and food security. Tan Yongzhong et al [10] (2017) have analyzed the spatial pattern of cultivated land area change of China before and after the second national land survey. Since 2011, based on the results of the second land survey and its change survey results, the Ministry of land and resources has conducted a supplementary survey on the national cultivated land quality grade achievements. In December 2017, the Ministry of land and resources published the 2016 national cultivated land quality grade update evaluation results [21,22], which divided the cultivated land into 15 grades. Since 2002, the Ministry of agriculture has launched a nationwide capability investigation and quality evaluation of cultivated land, and issued the national Bulletin of cultivated land quality grade [23] in December 2014. In terms of cultivated land ecological evaluation, it mainly involved cultivated land ecological danger [30] (including cultivated land pollution [31,32,33], cultivated land soil erosion [34], cultivated land natural disasters [35,36,37,38], etc.), cultivated land ecological security [39,40,41] and cultivated land system security evaluation [42], and cultivated land restoration in ecological damaged areas [43], etc
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