天祝白牦牛放牧牧草的重金属污染分析

在天祝县炭山岭、抓喜秀龙、松山、西大滩、石门 5个试验区采样,分析天祝白牦牛牧草中重金属污染程度,结果表明:夏秋牧草 Pb、As、Cd 未超标,综合污染顺序为炭山岭(3.646)>石门(2.572) >松山(1.248) >抓喜秀龙(0.714)>西大滩(0.588), Pb、Cd 存在显著相关(P<0.05),炭山岭、石门牧草质量为二级,牧草污染残留较多。冬春牧草 Pb、As、Cd 未超标,综合污染顺序为松山(2.754)>炭山岭(2.719)>石门(2.716)>西大滩(2.568)>抓喜秀龙(2.547),Pb、As、Cd 之间相关性小,牧草质量等级为二级,牧草污染残留物较多。牧草污染冬春季高于夏秋季。

Analysis of heavy metals pollution in forage grass of white yak in Tianzhu

The samples were taken from five regions (Tanshanling, Zhuaxixiulong, Songshan, Xidatan and Shimen) in Tianzhu and the heavy metals pollution in forage grass was analyzed.The results showed that Pb, As and Cd in summer-autumn grass satisfied the standard, the order of the general pollution degree was Tanshanling (3.646), Shimen(2.572), Songshan(1.248), Zhuaxixiulong(0.714) and Xidatan(0.588). It existed significant correlation between Pb and As. The grass quality of Tanshiling and Shimen belonged to secondary grade, and rudimental pollution of grass was more. Pb, As and Cd in winner-spring grass didn’t exceed the standard, the order of the general pollution degree was Songshan(2.754),Tanshanling (2.719), Shimen(2.716), Datan(2.568) and Zhuaxixiulong (2.547). It existed low correlation between Pb, As and Cd. The grass quality belongs to secondary grade, and rudimental pollution of grass was more. Pollution in winner and spring grass showed higher than that in summer and autumn.