划区轮牧在高寒草甸冬春草场的适宜性初探

The Primary Study on the Availability of Rotational Grazing in Pasture in Winter and Spring in Alpine Meadow

以祁连山东段高寒草甸为研究区域,设立划区轮牧(RG)、传统季节性放牧(CK)2种不同的草地管理方式,通过连续2年对植被群落结构、生物量、土壤紧实度和家畜体重的监测,探讨划区轮牧对高寒草甸冬春草场植物群落结构和家畜体重的影响,为建立高寒草甸合理、高效的放牧模式提供科学依据。结果表明,划区轮牧区牧后可食牧草风干重总体与传统季节性放牧区变化无显著差异,划区轮牧能显著提高群落多样性和优势种比例(P<0.05),土壤紧实度在2种草地管理制度下均无显著性差异,生长季末,划区轮牧区绵羊体重显著高于夏场传统季节性放牧区(P<0.05)。

Taking traditional seasonal grazing in winter pasture as the control（CK）,the effect of rotational grazing（RG）on vegetation（structure and biomass）,soil compaction and livestock body weight in winter pasture in alpine meadow in eastern Qilian Mountain was studied to provide a scientific reference for rational and efficient grazing system in Qinghai-Tibet Plateau.The indictors in term of vegetation（structure and biomass）,soil compaction and livestock body weight were measured for two years.The results showed that there was no significant difference in biomass between CK and RG,compared with CK,the RG could improve degree of dominance,species diversity and vegetation community structure of rangeland（P〈0.05）,but no significant influence on soil compaction.Most importance was that sheep body weight was greater than that in summer pasture（traditional seasonal grazing）at the end of the growth season（P〈0.05）.