Abstract:

The study aims to achieve the ecological protection and high-quality development of the Yellow River basin, clarify the soil nutrient status of the Yellow River floodplain in Henan Province, and develop a reasonable fertilization scheme for planting suitable non-timber forests in this region. The soil samples were collected in the Yellow River floodplain of Yuanyang County, Henan Province. The contents of abundant available nutrient N, P and K, medium trace element exchangeable Ca and Mg, available S, Zn, Cu, Fe, Mn and B, and organic matter, as well as pH and CEC (cation exchange capacity) were determined, and the correlations between soil nutrients and soil texture types were analyzed. The results showed that soil texture types in the Yellow River floodplain of Henan Province were divided into sandy soil, loamy sand, sandy loam, loam, silt loam and silt soil. The average pH value of the soil was 8.43, so the soil was alkaline. The contents of soil organic matter and abundant available nutrient N, P and K, and CEC were deficient. Except available boron, the contents of other medium trace elements were abundant. The correlation analysis showed that most of the nutrient elements were significantly correlated, and the organic matter, CEC, total N, available P and K, exchangeable Mg, available Cu, Fe, Mn and B were negatively correlated with pH, and the exchangeable Ca, and available S and Zn were less correlated with other elements. The Yellow River floodplain of Henan Province is very suitable for non-timber forests. In the process of cultivation management of non-timber forests in this region, it is necessary to pay attention to increase the application of organic fertilizer, rationalize the ratio of organic fertilizer and inorganic fertilizer, and at the same time, add proper amount of B fertilizer by foliar spraying, to achieve the purpose of improving quality and efficiency.

Key words: Yellow River floodplain, Henan Province, soil texture, soil nutrient status, non-timber forest