川西北草原土壤及冷暖季牧草微量元素含量比较  

Research on caparison of the content of trace element in soil and forage in Northwest Sichuan Grassland

作　　者：文勇立[1] 李辉[1] 李学伟[2] 杨雪[1] 王洪志[1] 朱刚[1] 

机构地区：[1]西南民族大学生命科学与技术学院,四川成都610041 [2]四川农业大学动物科学学院,四川雅安625014

出　　处：《生态学报》2007年第7期2837-2846,共10页Acta Ecologica Sinica

基　　金：国家民委应用基础重点资助项目(03N16)~~

摘　　要：改善土壤的理化环境及提高牧草的营养水平必须了解草地土壤及牧草微量元素的分布与含量。试验从川西北草地的亚高山丘原草甸、亚高山平坝草甸和沼泽平坝草甸采集土样和冷暖季草样。土样采集深度范围是0～10cm,10～20cm,20～30cm。应用火焰原子吸收光谱法测定了草样中铜、铁、锰、锌和钴的含量和土样中这些元素的有效态含量,应用氟离子选择电极法测定了土样中的氟离子浓度和草样中的氟含量。土壤pH高低顺序为草甸土>冲积土>泥炭草甸土,pH随土壤深度变深而下降;土壤和牧草的钴含量都处于缺乏状态,分别为0.64mg/kg和0.26mg/kg。牧草铁和锰含量都高于正常水平,铁为414.51～565.06mg/kg,锰为138.68～247.09mg/kg.Fully understanding of the distribution and contents of trace elements in soil and forage is important in order to improve the physical and chemic environment of soil and enhance the nutritional value of forage. Forage in warm and cold season and soil samples were collected from subalpine hill meadow, subalpine fiat meadow and subalpine swampy meadow in northwest Sichuan grassland, with the depth of soil in the ranges of 0 - 10cm, 10- 20cm and 20- 30cm. Contents of Cu, Fe, Mn, Zn and Co in forages and valid contents of these trace elements in soils were determined with flame atomic absorption spectrometry. Concentrations of F^- in soils and F in forages were tested with fluoride-ion selective electrode method. The pH of soils displayed an order as hill meadow Soil 〉 alluvium 〉 tufty meadow Soil. Moreover, soil pH decreased with the increasing depth of soil. Deficiency of Co in soil and forage was observed, 0.64 mg/kg in soil and 0.26 mg/kg in forage respectively. The forage contained higher normal level of Fe and Mn, namely, 414.51 -565.06 mg/kg of Fe, and 138.68 -247.09 mg/kg of Mn.

关 键 词：土壤 牧草 微量元素 火焰原子吸收光谱法 氟离子选择电极法 

分 类 号：S54[农业科学—作物学]