长沙市边缘带主要蔬菜基地土壤的肥力特性

通过野外调查采样和室内分析,对长沙市郊区176个土壤样品的肥力特征进行了系统研究.结果表明:总体养分状况良好,有机质、氰素、磷索和钾索含量均很丰富,其中土壤速效磷和速效钾含量远高于一般高产耕地土壤和自然土壤,是菜园土壤的一大显著肥力特征.第四纪红土发育的红菜园土的土壤有机质和全氮的平均含量要高于河流冲积物发育的冲积菜园土,但土壤全氮含量不如有机质含量差异大.冲积菜园土的土壤全磷和全钾含量高于红菜园土.而有效养分含量两种母质发育的土壤间差异不大.不同蔬菜基地之间部分养分差异明显,同一蔬菜基地也存在养分间的不平衡现象.潭阳洲蔬菜基地的肥力水平比较低,只有全钾和速效钾的含量处于中等水平,其它指标都是本次调查5个蔬菜基地中最低的.(朗)梨村的整体肥力水平也比较低,但有机质含量最高.东湖村、陈家渡、杉木村的整体肥力水平比较高.

Fertility Properties of the Soil in Chief Type Vegetable Bases in the Verge Zone of Changsha

By field investigation,sampling and laboratory analysis,the fertility properties of 176 soil samples in the suburbs of Changsha were studied.The results showed that the nutrient status of the soil was good on the whole; the contents of organic matter,nitrogen,phosphorus and potassium were rich.Especially the contents of available phospho-rus and potassium were much higher than that of the other cultivated soil.The contents of organic matter and total ni-trogen of the reddish vegetable soil developed from Quaternary Red Clay were much higher than that of the vegetable soil developed from river alluvium.The vegetable soil developed from river alluvium had much higher nutrient contents in total phosphorus and potassium than that of the reddish vegetable soil developed from Quaternary Red Clay.The content of available nutrient was no difference in the soil developed from the two types of parent materials.Different vegetable soil had obvious differences in some nutrient,and there was also the imbalance between nutrients in the same vegetable soil.The nutrient status of vegetable soil in Tanyangzhou area was at low level relatively,the indicators but total and available potassium contents were the lowest in the surveyed five vegetable bases.The overall fertility of Lan-gli area was also at low level relatively,but content of organic matter was the highest.The soil fertility status of the veg-etable soil in the areas of Donghu,Chenjiadu and Shanmu was at high level.