云南蒙自石榴园土壤养分及其在根区的分布状况

目的]为果园土壤养分管理提供参考。方法]对云南蒙自石榴园距树干基部水平方向0～200cm、垂直方向0～80cm土层深度范围内的果树根区土壤养分变化进行了研究。结果]研究区石榴园土壤有机质含量平均为34.71g/kg,碱解氮含量平均为48.83mg/kg,速效磷含量平均为94.92mg/kg,速效钾含量平均为197.22mg/kg。在垂直方向上,石榴园土壤养分主要集中分布在0～20和20～40cm土层,随着土层厚度的增加土壤养分含量逐渐下降;在水平方向上,土壤养分主要集中分布在距树干基部0～50cm范围内,随着距树干基部距离的增加土壤养分含量逐渐下降。结论]除碱解氮外,研究区石榴园养分含量普遍较丰富。

Soil Nutrients and Their Distribution in Root Zone in Pomegranate Orchard in Mengzi of Yunnan

Objective] The aim was to provide the references for soil nutrient management of orchard. Method] The change of soil nutrients in the root zone of pomegranate trees in the range of horizontal distance to the stem base of 0-200 cm and the depth of 0-80 cm in pomegranate orchard in Mengzi of Yunnan was studied. Result] In the pomegranate orchard of investigated zone,the average contents of organic matter,available nitrogen,available phosphorous and available potassium in soil were 34.71 g/kg,48.83,94.92 and 197.22 mg/kg resp. In vertical direction,the major soil nutrients of pomegranate orchard were concentrated in the soil layers of 0-20 and 20-40 cm,and the content of soil nutrients was decreased gradually along with the increase of soil-layer depth. In horizontal direction,the major soil nutrients were concentrated in the range with distance of 0-50 cm to stem base,and the content of soil nutrients was decreased gradually along with the increase of distance to stem base. Conclusion] Except for available nitrogen,the nutrients in the pomegranate orchard of investigated zone were richer generally.