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The soil nutrient status and comprehensive fertility of agricultural fields in Nanchong were scientifically and objectively evaluated based on 12 nutrient indicators of 872 soil samples, through comprehensive fertility index method, factor analysis method, entropy coefficient method and coefficient of variation method. The soil in Nanchong was alkaline, with low content of organic matter, rich content of phosphorus and iron, high content of copper and zinc, suitable content of potassium and manganese, low content of nitrogen, boron and molybdenum. In the comprehensive fertility index method, the comprehensive fertility index value was 0.75, which was in the third grade, and the overall soil fertility was poor. Only the comprehensive soil fertility of Peng’an County reached the second grade, which was 0.96. In the factor analysis method, the proportion of grade 4 samples was 42.09%, that of grade 3 samples was 34.52%, that of grade 2 samples was close to that of grade 5 samples, that of grade 1-3 samples accounted for 46.68%, that of grade 4-6 samples accounted for 53.52%, and the overall soil fertility was slightly low. In the entropy coefficient method, the comprehensive fertility of soil was 0.082 96, which was between the second and third grade, and the overall fertility of soil was medium. The comprehensive soil fertility value of the coefficient of variation method was 34.09, which was between the first and second grade, and the overall soil fertility was high. Among the four evaluation methods, the coefficient of variation method had the highest soil fertility level, followed by entropy coefficient method and factor analysis method. The comprehensive fertility index method had the lowest fertility level. Through comparative analysis, the result of the factor analysis was more in line with the actual situation of Nanchong. The comprehensive fertility of farmland soil in Nanchong was slightly low. To improve the comprehensive fertility of agricultural land, it is necessary to reduce soil alkalinity, increase organic matter content, and pay attention to the supplementation of fertilizers such as nitrogen, boron, and molybdenum.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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