【摘要】 选用不同生育时期(返青期、越冬期)不同种植年限(一、二、三年)苦参土样为材料,研究种植年限、生育时期对栽培苦参土壤理化性质的影响.结果表明,随着种植年限的增加,土壤速效、全效养分含量为一年生>三年生>二年生,有极显著差异;有机质含量随着种植年限的增加呈逐年下降趋势,存在极显著差异;容重先下降后趋于稳定;除了三年生pH值返青期低于越冬期外,其余返青期均高于越冬期.根据第二次土壤普查土壤养分分级标准,不同时期不同种植年限苦参土壤中有机质、全氮、全磷的含量均处于低至中下水平(5～4级),有效磷、全钾处于中上至高水平(3～2级),碱解氮含量处于低水平(5级),速效钾含量处于中下水平(4级).更多还原

【Abstract】 Soil samples of different growth periods(green period, overwintering period)and different planting years(one, two, three years)of Sophora flavescens were selected to study the effects of planting years and growing period on their physical and chemical properties. With the increase of planting years, there were significant differences in the contents of available and total nutrients between annual > and three-year > two-year plant durations. The organic matter decreased year by year with the increase of planting years, and there were significant differences. Bulk density first decreased and then stabilized. The pH value of the three-year green period was lower than the overwintering period, with the remainer being higher than during the overwintering period. According to the soil nutrient classification standards of the second soil census, the contents of organic matter, total nitrogen and total phosphorus in the soil of sophora flavescens at different periods and different planting years were all at the low to middle levels(level 5～4), effective phosphorus and total potassium in upper middle to high level(level 3～2), the alkali solution nitrogen content in the low level(level 5), and available k content in the middle and lower level(level 4).更多还原