牦牛干扰下草原毛虫对小嵩草高寒草甸植物群落特征的影响

发布时间：2018-07-07 20:31

本文选题：牦牛 + 草原毛虫　；参考：《草业科学》2017年04期

【摘要】：采用野外受控放牧试验(放牧和不放牧)和人工控制草原毛虫(Gynaephora qinghaiensis)方法(草原毛虫移除和未移除),研究了牦牛干扰下草原毛虫对高寒草甸小嵩草(Kobresia pygmaea)草地植被群落(植被盖度、群落高度、地上生物量及植物多样性等)的影响。结果表明,在试验期内,草原毛虫种群数量随着时间的推移呈现出先增加后降低的趋势。在牦牛(Bos mutus)放牧区内草原毛虫种群数量及增长趋势均高于无牧区。草原毛虫单独存在时群落的盖度、高度及地上总生物量与对照(牦牛与草原毛虫都不存在,CK)差异不显著(P0.05),而牦牛与草原毛虫共存时群落盖度、高度及地上总生物量都显著低于CK(P0.05)。牦牛干扰了草原毛虫对群落中主要植物种的作用,植物重要值发生了显著变化。草原毛虫单独存在时植物多样性指数与CK间无显著差异,单独放牧牦牛和牦牛与草原毛虫共存时的植物多样性指数均显著低于CK(P0.05)。本研究表明,牦牛显著加剧了草原毛虫对小嵩草高寒草甸植被的影响。
[Abstract]:Field controlled grazing test (grazing and ungrazing) and artificial control of grassland caterpillar (Gynaephora qinghaiensis) were used to study the vegetation community (vegetation coverage) of Kobresia pygmaea grassland under yak disturbance. Community height, aboveground biomass and plant diversity. The results showed that the population of Caterpillar increased first and then decreased with time. In the grazing area of yak (Bos mutus), the population and the increasing trend of caterpillars in grassland were higher than those in non-grazing areas. There was no significant difference in coverage, height and total aboveground biomass between grassland caterpillar and CK (P0.05), but the community coverage, height and total aboveground biomass of yak and grassland caterpillar were significantly lower than CK (P0.05). Yak interferes with the effect of caterpillar on the main plant species in the community, and the important value of plant changes significantly. There was no significant difference between the plant diversity index of grassland caterpillar and CK, and the plant diversity index of yak and yak living with grassland caterpillar was significantly lower than that of CK (P0.05). The results showed that the effect of caterpillars on the vegetation of Kobresia humilis alpine meadow was significantly increased.
【作者单位】：甘肃农业大学草业学院;贵州省草业研究所;东北师范大学草地科学研究所;黑龙江省农业科学院草业研究所;
【基金】：国家自然基金重点项目“草食动物采食调解下的草地多营养级生物多样性关系及其生态功能”(31230012)
【分类号】：S812

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