高寒草地放牧系统锰的季节变化及盈缺分析

Seasonal variation and supply-demand analysis of manganese in alpine grazing grassland system

对青海三角城种羊场夏(6月中旬)、秋(9月中旬)、冬(12月中旬)3季的水、土壤、牧草、绵羊被毛、血液、组织器官中锰含量进行了调查采样分析,结果表明,土壤锰含量夏季高于秋冬两季,都处于正常范围的下限,牧草和绵羊组织器官(肝脏除外)中锰为夏季>秋季>冬季,冬季则处于临界缺乏水平。从整个土壤-牧草-畜体生态体系来看,青海三角城种羊场绵羊冬季处于临界缺锰的营养状况。

The content and seasonal changes of Mn in water, soil, edible grass （gained by fistula set on esophagus）, wool and other organs such as plasma, liver, skeleton in sheep on Sanjiaocheng Sheep Farm of Qinghai Province from mid June to mid December were studied. The results indicated that Mn content in soil was higher in summer than that in autumn and winter but all were in lower threshold of normal level. In edible grass and sheep organs （except for liver）, the order of Mn contents in different seasons was summer ）〉 autumn 〉 winter, and it was insufficient in winter. Generally, in terms of soil-forage-sheep ecosystem, the Mn supply for sheep was insufficient in winter.