沈阳市近郊蔬菜保护地土壤有效微量元素含量状况分析

在沈阳市近郊采集了336个蔬菜保护地耕层土样,通过室内化验分析查明了保护地土壤有效性微量元素含量状况.调查区土壤有效性锰、铁、铜、锌、硼、硅的含量变幅较大,其中,尤以有效铜的变化幅度最大,平均含量为5.81 mg/kg,最低含量为0.02 mg/kg,最高达24.59 mg/kg,两者相差1200多倍.有效锌的变化幅度为0.02～7.83 mg/kg,平均4.89 mg/kg.有效铁和有效锰的含量分别为15.49～140.24 mg/kg,4.77～83.66 mg/kg,平均为83.09 mg/kg和13.93 mg/kg.有效硼的变化幅度为0.12～0.86 mg/kg,平均0.39 mg/kg.有效硅的变化幅度为152～964 mg/kg,平均443.08 mg/kg.土壤微量元素变化幅度大与土壤类型、棚龄和施肥水平有直接关系.碳酸盐土壤上的保护地土壤微量元素含量普遍偏低,其他土壤的相差不大.随着保护地棚龄的增加,土壤有效性微量元素略有提高,变幅缩小.按大田土壤的微量元素丰缺指标,本区的有效铁丰富的占100%;有效锰丰富的占67.86%,缺乏的占32.14%;有效铜丰富的占100%;有效锌丰富的占98.8%,缺乏的占1.2%;有效硼丰富的占23.81%,缺乏的占76.19%;有效硅丰富的占100%.

Status of Available Microelement Contents in Sheltered Grounds of Shenyang Suburb

336 soil samples(0~20 cm) were collected in sheltered grounds of Shenyang suburb to study the status of microelement contents.The average contents of available iron,manganese,copper and zinc were 83.09 mg/kg,5.81 mg/kg and 4.89 mg/kg respectively.Factors affected the contents of microelements were soil types,cultivation ages and fertilization.Sheltered grounds originated from carbonate soils contended comparatively low levels of microelements,The contents of microelements increased slightly as the cultivated time increased.