Abstract:

Based on the monitored data of cultivated land quality from the monitoring sites during the period of 2009-2022, this study performed analysis of the current status of the soil quality of cultivated land in Zhejiang Province, and evaluated the variation trend of the contents of soil nutrients in the cultivated land. The results showed that the average contents of soil organic matter and total nitrogen in the topsoil at the monitoring sites were at a high level, with high levels of available phosphorus and medium levels of available potassium. Among them, for the paddy field monitoring sites, the average contents of soil organic matter, total nitrogen, and available phosphorus were at a relatively high level, while the available potassium was at a medium to lower level. For the dryland monitoring sites, the average contents of soil organic matter and total nitrogen were at a relatively high level, while the average contents of available phosphorus and available potassium is at a high level. In addition, the results of 14 years of consecutive monitoring showed that as a whole, soil fertility of paddy field performed a stable and upward trend, however, deficiencies of phosphorus and potassium commonly occurred. Besides, we found an improvement in soil fertility of dryland field, especially an obvious increase in soil organic matter and enrichment of soil phosphorus and potassium content. Howerer, the acidification degree of drylands was higher than that of paddy fields, and it had a tendency to intensify. Therefore, it is necessary to carry out works (e.g., soil testing and formula fertilization, and fertilizer quota system) to achieve a balance of soil nutrients. At the same time, soil acidification management is needed to suppress the acidification process of cultivated land.

Key words: Zhejiang Province, cultivated land quality, long-term location monitoring, variation trend