关键词: 黄河三角洲, 白蜡, 人造林, 种植, 土壤养分

Abstract:

To explore the planting model of Fraxinus chinensis plantation in the Yellow River Delta and improve the management level, 5-year-old Fraxinus chinensis was used as material, and the treatments were set up, including different planting densities and different intercropping crops. The stratified samplings in different planting soils were taken for the difference analysis. The results were as follows: (1) with the increase of soil depth, the contents of organic matter, alkali nitrogen, available phosphorus and available potassium in soil decreased gradually; (2) planting density had great influence on the soil nutrient contents, the highest alkali nitrogen content in each soil layer was observed in the planting spacing of 1 m×1 m, however the highest available phosphorus content was obtained in the planting spacing of 3 m×3 m; (3) intercropping could alter the soil nutrients in a Fraxinus chinensis plantation, in comparison with un-planted areas, the contents of alkaline nitrogen in the areas of intercropping pumpkin and sweet potato decreased by 25.85% and 19.94%, and increased by 4.52% and 2.8% respectively in the areas of intercropping soybean and alfalfa; the organic matter contents of intercropping pumpkin, soybean, sweet potato and alfalfa decreased by 11.54%, 6.82%, 17.94% and 3.25%, respectively; (4) the larger the specification of Fraxinus chinensis with the same age, the more the available phosphorus content in the soil, whereas the contents of alkali nitrogen, available potassium and organic matter presented a decreasing trend. This study provides technical support and guidance for the planting patterns of Fraxinus chinensis plantations in the Yellow River Delta.

Key words: Yellow River Delta, Fraxinus chinensis, plantation, planting, soil nutrient