通过对1—9年生红豆草地的观测表明,随着红豆草生活年限的增长,土壤有机质及氮、磷全量养分逐年提高,土壤容重,比重和坚实度递减,而土壤孔隙度,水稳性团粒递增。显示出红豆草具有改善土壤理化性状,提高土壤肥力,增加土壤养分储量,增强养分供应强度的良好作用,但红豆草利用年限以五年为宜。 The observation of 1 - 9 years old red grassland showed that with the growth of sainfoin life, the total nutrients of soil organic matter, nitrogen and phosphorus increased year by year, soil bulk density, specific gravity and firmness decreased gradually, while the soil porosity, Increment. The results showed that sainfoin had a good effect on improving soil physical and chemical properties, increasing soil fertility, increasing soil nutrient reserves and enhancing nutrient supply intensity. However, safflower could be used for five years.