【摘要】 本文研究了中国东北地区不同纬度梯度农田土壤Olsen-P在0～100cm剖面中的分布特征。结果表明,除公主岭和大石桥外,其他各点土壤Olsen-P含量在0～20cm土层较高,20～40cm土层迅速下降,40～100cm各土层又逐渐升高,但底层要远低于表层。不同纬度梯度下各点0～20cm土层Olsen-P含量为暗棕壤>黑土>棕壤,高纬度地点Olsen-P含量具有高于低纬度地点的趋势;20～100cm各土层Olsen-P含量总体表现为黑土和暗棕壤相对较高,棕壤区偏低,没有明显的纬度分异现象。施肥等农田管理措施对0～20cm土壤Olsen-P含量有明显影响,其他土层Olsen-P含量可能主要受磷素运移特点和成土母质等因素影响。更多还原

【Abstract】 Distribution of soil Olsen-P at profiles (0-100cm) in farmlands of Northeast China was studied along a latitude gradient. Results showed that soil Olsen-P contents were high in 0-20cm layer,and decreased rapidly in 20-40cm layer,and then increased slightly in layers at the depth of 40-100cm,except for the Gongzhuling and Dashiqiao sites. As for different latitudes,at the depth of 0-20cm,soil Olsen-P content was in the order of dark brown earth > black soil > brown earth,which means that Olsen-P was tended to be higher in the high latitude sites than that in the low latitude sites. Generally,soil Olsen-P contents were comparatively higher in the dark brown earth and black soil sites and lower in the brown earth sites in layers at the depth of 20-100cm,and no significant differences with latitudes was found in these layers. Agricultural management such as fertilization could affect soil Olsen-P contents in 0-20cm layer,while it could have been influenced by factors such as P transformation and parent materials in soils.更多还原