不同轮作模式农田磷养分表观平衡及其对土壤Olsen-P含量的影响

通过连续3年监测上海郊区43块定位农田研究,比较了50种作物以及5种不同轮作模式农田的磷养分表观盈余状况及其对土壤Olsen-P含量的影响。结果表明:(1)不同作物农田的磷养分盈余趋势为水生蔬菜类果树类旱作蔬菜≥草皮大田作物;不同轮作模式农田磷养分盈余趋势为菜菜轮作果树单作菜作轮作草皮单作作物轮作;(2)不同作物及轮作农田收获后土壤Olsen-P含量随土壤深度的增加而逐渐降低,磷养分盈余量多的农田土壤Olsen-P含量也高;(3)不同作物以及轮作农田磷养分盈余与收获时土壤表层(0~30cm)的Olsen-P含量呈显著正相关。

Phosphorus nutrient balance and its impact on soil Olsen P content in Shanghai suburb farmlands

Phosphorus nutrient balances of the farmland soils in 50 varieties of crops and 5 types of rotation and its impact on soil available phosphorus nutrient content were studied in 43 site specific locations over three years in Shanghai suburb.The result indicated that:(1)the phoshorus nutrient surplus tendency of different crops farmland was:fewflower wildrice>fruits>vegetables>greensward>crops;The phosphorus nutrient surplus of different rotation farmland was:the rotation between vegetable and vegetable>the fruit tree only>the rotation between vegetable and crops> the greensward only>the rotation of crops and crops;(2)Content of soil available phosphorus after harvest gradually decreased with the depths of soil profile in the farmlands of different fields and different rotation fields.The higher soil available phosphorus contents were,the more phosphorus nutrient surplus would be in different planting patterns fields.(3)Phosphorus nutrient surpluses of the farmland soil in different crops fields and different planting patterns were significantly positive correlated with the content of available phosphorus content in the surface soil(0~30 cm)in harvesting.