3种常见速生灌木吸收红壤氮磷能力的比较

由于大量施用肥料造成养分在土壤中积累,已经成为重要的面源污染源。通过栽植植物篱截留养分是防止面源污染的最有效措施之一。为了更好地利用植物资源,采用土培盆栽试验的方法比较了3种常见速生绿化灌木红叶石楠Photinia fraseri,金森女贞Ligustrum japonicum‘Howardii’和柳叶蜡梅Chimonanthus salicifolius对红壤氮磷的吸收积累能力。结果表明,红叶石楠对土壤氮的吸收能力最强,积累量最大,达到30mg·盆-1,可作为红壤氮截留的首选植物篱植物;而金森女贞对土壤磷的吸收能力最强,吸收积累土壤磷达到8mg·盆-1,同时对土壤氮的吸收积累量也达到了25mg·盆-1,金森女贞可以作为红壤植物篱的植物种类。红叶石楠与金森女贞配合混植有可能起到更有效的植物篱功效。

Absorption of soil N and P by three fast growing bush species

Due to soil and water erosion, excessive nutrient loss in heavily fertilized farmland is creating serious pollution problems and contributing to groundwater contamination as well as non-point source pollution; hedge plants may help control this problem. In order to chose bush species with strong absorption ability, a soil-pot experiment was conducted to test the capability of soil nitrogen （N） and phosphorus （P） absorption by three fast growing bush species： Ligustrum japonicum ＇Howardii＇ , Photinia fraseri, and Chimonanthus salicifolius. Results showed that P. fraseri was able to uptake N most actively （P〈0.01）;meanwhile L. japonicum ＇Howardii＇ was able to uptake P most actively （P〈0.01） together with strong ability to absorb N. Therefore, intercropping with these two species may act as a more efficient barrier to N and P loss from soil and water erosion.