为有效挖掘苹果园生草潜在的利用价值，确保苹果园生草绿色环保利用。以宁县苹果园种植的多年生黑麦草为研究对象，通过比较其不同生长期的重金属含量，确定果园黑麦草作为饲草的安全性。结果表明，宁县苹果园多年生黑麦草5种重金属元素中，铅、砷、镉和汞4种重金属各月份含量均远低于国家限定标准；铬元素在生长期各月份含量均高于国家限量(5 mg/kg)，其中7月份最高，为31.15 mg/kg。说明铬元素可作为苹果园牧草安全利用监测和控制的重点对象，苹果园黑麦草尚不能作为饲喂家畜的主饲草。

In order to effectively tap the potential utilization value of apple orchard grass, to ensure the green use of orchard, taking Lolium perenne planted in the orchard of Ning County as the research object, the content of heavy metals in the growing period was measured. The results indicated that among the 5 heavy metals in perennial ryegrass from apple orchards in Ning County, the monthly concentrations of lead, arsenic, cadmium, and mercury were all far below the national limit standards. However, the concentration of chromium exceeded the national threshold(5 mg/kg) throughout the growing season, with the highest value of 31.15 mg/kg recorded in July. The results suggested that chromium element should be the key object of monitoring and controlling the safe utilization of forage in orchards, and perennial ryegrass in orchards could not be used as the main forage for livestock.

S543.6