Relationship between Available State and Forms of Selenium and Zinc in Farmland Soil of Luoyang City and Its Influencing Factors

The form and available state of elements are important indexes to evaluate the activity of elements. Research on the relationship between the available state and form of selenium (Se) and zinc (Zn) in farmland soil is an important basis for accurate land quality evaluation. In this paper, the available states and different forms of Se and Zn in the soil of high Se background area in Luoyang farmland were studied. The results show that the available Se in wheat soil can be replaced by the sum of water-soluble state, ion state and carbonate state. The available Se in the soil of corn, millet, sesame, peanut and sweet potato can be replaced by the sum of water-soluble state and ion state. Available Zn can be represented by the sum of water-soluble, ionic and carbonate states. The active Zn in the farmland soil developed in the basalt area was low and similar to the water-soluble Zn. The available state and forms of Se and Zn in farmland soil were mainly affected by total amount, but also by cultivated crops, pH and organic matter. It is necessary to consider agricultural planting, pH and organic matter to evaluate the availability of Se and Zn by using the form instead of the available state in farmland soil. The BRIEF REPORT is available for this paper at http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202308210139.