施肥对环青海湖地区草甸群落生长的影响

Effects of Fertilization on the Community Growth of Hygropium around Qinghai Lake

通过环青海湖地区草甸羊粪添加控制试验,研究不同用量羊粪(S0,S1和S2分别为0,0.34,0.56 kg·m^(-2))对该草甸群落结构和生产力、生物多样性及土壤含水量的影响。结果表明:S1与S0,S2与S0,S1与S2间的植物群落高度存在显著差异(P<0.05),植被平均盖度差异不显著;除籽蒿(Artemisia sphaeroce phala)外,各处理对研究地区的主要物种高度均存在显著差异(P<0.05);各处理间植株重要值差异不显著;除了豆科地上生物量和地上总生物量各处理间无显著差异,其他主要物种地上生物量几乎都存在显著差异(P<0.05);各处理间群落丰富度指数变化不显著,群落均匀度指数为S0高于S1和S2,S0与S1存在显著差异(P<0.05);对于物种多样性指数,S1和S2均低于S0,S0与S2差异不明显,且S0与S1及S1与S2存在极显著差异(P<0.01)。施肥对0~15 cm表层土壤含水量的影响较为明显,对15~30 cm土壤含水量影响不大。

The effects of fertilization on the community structure, productivity, biological diversity and soil water content of hygropium around Qinghai Lake. Results showed that the vegetation heights of hygropi um had significant difference between S1 and SO, S2 and SO, Sland S2 treatments （P〈0.05）. The heights of main species except Artemisia sphaerocephala had significant difference among all treatments （P〈0.05）. The above-ground biomass of main species except Leguminosae sp. had significant difference a- mong all treatments （P%0.05）. However, there was no significant difference in the average coverage, vegetation importance value and community richness index of hygropium. The species diversity indices had significant difference between SO and S1, S1 and S2 （P〈0.01）. The soil water contents of 0~15 cm soil layers were more influenced than that of 15~30 cm soil layers by fertilization.