【摘 要】
：
为探究青海省玉树县高寒草甸草地不同月份牧草7种矿物质元素(钠(Na)、锌(Zn)、铜(Cu)、铁(Fe)、镁(Mg)、钾(K)、钙(Ca))的含量,并对牧草矿物质元素的季节动态进行分析,改善当地牧场补饲管理.每个月份采取草样6份,共36份草样.称量0.5g的草样放在马福炉550±15℃温度下进行灰化,用盐酸溶解残渣并稀释定容,采用火焰原子吸收光谱法对夏秋两季的牧草进行了矿物质元素含量的测定.不同月
【机 构】
：
省部共建三江源生态与高原农牧业国家重点实验室,青海省高原放牧家畜动物营养与饲料科学重点实验室,西宁810016
【出 处】
：
2017第四届中国肉牛选育改良与产业发展国际研讨会
论文部分内容阅读
为探究青海省玉树县高寒草甸草地不同月份牧草7种矿物质元素(钠(Na)、锌(Zn)、铜(Cu)、铁(Fe)、镁(Mg)、钾(K)、钙(Ca))的含量,并对牧草矿物质元素的季节动态进行分析,改善当地牧场补饲管理.每个月份采取草样6份,共36份草样.称量0.5g的草样放在马福炉550±15℃温度下进行灰化,用盐酸溶解残渣并稀释定容,采用火焰原子吸收光谱法对夏秋两季的牧草进行了矿物质元素含量的测定.不同月份牧草的矿物质元素含量除Mg外,没有显著性差异(P＞0.05),其他矿物质元素含量均差异极显著(P＜0.01),具有明显的季节性.Mg含量在62.68～64.11μg/g之间；Na、Zn含量季节动态为"M"字形,其含量分别在52.3～104 μg/g和16.2～21.47 μg/g之间；K、Cu含量大致呈"A"字形,其含量分别在162.13～239.42μg/g和8.51～40.14μg/g之间；Fe含量呈"V"字形,其含量在111.4～212.07 μg/g之间；Ca含量呈"N"字形,其含量在231.04～813.05 μg/g之间.青海省玉树县高寒草甸草地牧草中矿物质元素含量具有明显的季节性.牧草中富含Cu和Fe含量,但Zn含量低于反刍动物Zn日粮需求量40 μg/g,Mg含量也低于牧草含量需求751 μg/g,这可能与当地的土壤背景有关.
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