关键词: 竹炭, 三叶草, 土壤细菌群落, 土壤细菌丰度

Abstract: The aim of this study was to identify the types of dominant limiting factors of cultivated land quality in Baoji City. According to the spatial distribution of the improving potential of limiting factors, we divided the potential zoning of cultivated land quality improvement, and discussed the improvement measures of cultivated land quality in different potential zones. The results showed that the main type of limiting factors of cultivated land quality was the type of single factor, including soil layer, organic matter, and irrigation, which accounted for 66.11% of total area. The improving potential of cultivated land quality in Baoji City was at a medium level. The distribution trend was high in the north and low in the south, with certain spatial clustering characteristics. A total of 334 administrative villages in Baoji City have a high potential for improving the quality of cultivated land, which shows “HH” distribution type (Grade I District). Thus, we can increase the intensity of land consolidation projects in this region to improve the overall level of cultivated land quality. Strategies to improve the quality of cultivated land in the central part of Baoji City should focus on increasing the effective soil layer thickness, increasing the content of soil organic matter, and improving the irrigation conditions of agricultural land. In addition, the improvement of soil erosion should be strengthened in the northern region, and effective measures to reduce the impacts of rock outcrop and topographic slope on the quality of cultivated land should be taken in the southern region.

Key words: bamboo charcoal, Trifolium repens, soil bacterial community, soil bacterial richness.