1. College of Resource and Environment, Henan Agricultural University, 450002, Zhengzhou, China; 2. Key Laboratory for Agricultural Land Quality, Monitoring and Control, Ministry of Natural Resources, 100193, Beijing, China; 3. Land Consolidation and Rehabilitation Center, Ministry of Natural Resources, 100035, Beijing, China; 4. College of Resource and Environment, Southwest University, 400716, Chongqing, China
Abstract：[Background] Cultivated land health is the foundation of food security and the foundation of a nation. It is particularly important to explore farmland health evaluation methods that conform to the new era. Yiyang county is located in the loess hilly area. It is a typical ecologically fragile area and concentrated contiguous poverty area in China. The terrain is fragmented and complex. The quality of cultivated land and the spatial heterogeneity of the soil environment are strong. The research can be used to promote the high efficiency of cultivated land resources in the loess hilly area. [Methods] In order to meet the needs of cultivated land management in the new era, this paper selected 3 criteria layers of cultivated land quality, cultivated land productivity and soil environment, a total of 16 indexes to build a cultivated land health evaluation system in the loess hilly region. Cultivated land quality includes 8 indicators: surface soil texture, depth from barrier layer to surface, profile structure, organic matter content, topographic slope, soil pH, irrigation guarantee rate and drainage conditions. Cultivated land productivity includes 1 indicator of unit yield of cultivated land. The soil environment contains 7 evaluation indicators of beneficial trace elements and soil erosion. The beneficial trace elements are: effective B, effective Mn, effective Mo, effective Fe, effective Cu and effective Zn. The methods of layer overlay quantitative evaluation, analytic hierarchy process and minimum factor were used to evaluate the health status of cultivated land in Yiyang county.[Results] The quality score of the cultivated land in Yiyang county is between 62.7-100.0, The area composition of first to fourth grade is 16.38%, 75.88%, 7.62% and 0.12%, respectively. The quality of cultivated land on both sides of Luohe river is the best, and the overall quality of cultivated land on the north side of the river is higher than that on the south side. The cultivated land productivity index is between 0.18 and 1.00, and the area ratio of productivity levels from low to high is 2.87%, 21.89%, 46.12%, 21.25%, and 7.87%, respectively. The areas of soil environmental index from low to high were 2.99%, 36.69%, 47.77% and 12.56%, respectively. The overall level of soil environmental assessment is medium to low. And the differentiated characteristics of the cultivated land health evaluation results in Yiyang county are obvious. The proportion of healthy, mild sub-health, moderate sub-health and unhealthy areas is 16.08%, 33.54%, 45.47% and 4.91%, respectively. Most areas of Yiyang county are in mild sub-health and moderate sub-health status. The health status of the cultivated land on the 2nd side of Luohe river is the best. Huaguoshan town and Shangguan town in the southwest of the study area are in the lowest cultivated land health levels.[Conclusions] Based on the characteristics of the loess hilly region and the human demand for cultivated land, the author breaks the conventional comprehensive method model and conducts targeted evaluation of cultivated land health in Yiyang county. The research on cultivated land health in the loess hilly area provides new opportunities for cultivated land protection. The idea provides a scientific basis for the improvement of cultivated land quality and a useful reference for the research of cultivated land resource safety.
孟庆香, 张莉坤, 郧文聚, 吴天, 陈兵飞, 位贺杰. 黄土丘陵区典型县域耕地健康评价:以河南宜阳县为例[J]. 中国水土保持科学, 2021, 19(1): 11-19.
MENG Qingxiang, ZHANG Likun, YUN Wenju, WU Tian, CHEN Bingfei, WEI Hejie. Health evaluation of cultivated land in typical counties of loess hilly region: A case study of Yiyang county, Henan province. SSWC, 2021, 19(1): 11-19.
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2021, Vol. 19 
