硒在草地放牧系统“土壤-植物-动物”间的流动与调控

发布时间：2018-04-09 23:02

本文选题：硒元素　切入点：草地放牧系统　出处：《草业科学》2017年04期

【摘要】：硒(Se)作为动物必需而容易缺乏的微量元素,具有多种生物学功能。在草地放牧系统中,硒随着物质在土壤、植物和动物之间的转移而循环流动。本文从硒在放牧草地"土壤-植物-动物"间的含量、分布及功能等方面,对国内外的研究现状进行了综述,分析了硒在放牧系统中的循环流动特点。结果表明,硒在土壤、植物和动物中的含量分别为0.1~2.0、0.05~1.50和0.02~0.05mg·kg-1。受多种因素影响,硒在土壤、植物和动物之间的流动量存在较大差异且不稳定,导致放牧家畜往往容易出现硒元素摄入不足的现象。在合理的放牧制度下,采取适宜的施肥方式,补播对硒积累能力强的牧草品种,可有效增加草地放牧系统中硒的循环流动量,以缓解或解决放牧家畜缺硒的不利局面。
[Abstract]:As a necessary and easily deficient trace element in animals, se (See) has a variety of biological functions.In grassland grazing systems, selenium circulates along with the transfer of matter between soil, plants and animals.In this paper, the content, distribution and function of selenium in grazing grassland "soil-plant-animal" were reviewed, and the characteristics of selenium circulation in grazing system were analyzed.The results showed that the contents of selenium in soil, plant and animal were 0.1 ~ 2.0 ~ 0.05 ~ (-1) and 0.02~0.05mg 路kg ~ (-1), respectively.Under the influence of many factors, there is a great difference and instability of selenium in soil, plant and animal, which leads to the phenomenon of selenium deficiency in grazing livestock.Under the reasonable grazing system, the suitable fertilization method and the supplementary sowing of forage varieties with strong selenium accumulation ability can effectively increase the circulation of selenium in grassland grazing system, so as to alleviate or solve the disadvantage of selenium deficiency in grazing livestock.
【作者单位】：中国农业科学院草原研究所;中国农业科学院北京畜牧兽医研究所;中国动物卫生与流行病学中心;中国农业大学动物科技学院;
【基金】：国家牧草产业技术体系项目(CARS-35)
【分类号】：S812.8

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