夏季放牧对大通河上游高寒沼泽草甸植被和土壤化学计量特征的影响

摘要

为探究放牧对大通河上游高寒沼泽草甸植被与土壤化学计量特征的影响,在祁连县默勒镇瓦日尕村一高寒沼泽草甸草场进行连续两年的牦牛放牧试验.结果表明:高寒沼泽草甸休牧一年后,草地植被株高、优良牧草盖度、地上植物量均呈现出上升趋势,草地状况有较大改善;放牧显著降低草地植物株高、地上植物量和优良牧草的地上植物量(P＜0.05),豆科和杂类草植物量略有上升趋势,但差异不显著(P＞0.05).草地植物总盖度、各经济群落的分盖度、地下植物量、土壤含水量均略有下降趋势,但差异不显著(P＜0.05).土壤养分中,全钾和速效氮略有上升趋势,但差异不显著(P＞0.05),有机质、全氮、全磷、速效磷和速效钾均不显著降低(P＞0.05).%In order to investigate the effect of grazing on vegetation and soil stoichiometric characteristics of alpine swamp meadow in the upper reaches of Datong River, The yak grazing experiment was carried out on the Alpine swamp meadow in Waliga Village, Merle Town, Qilian County. The results of two years' experiment showed that after a year off from grazing in alpine swamp meadow, the plant height, fine grass coverage and aboveground plant quantity of grassland showed a rising trend, and the condition of grassland was improved greatly. Grazing decreased the plant height, the aboveground plant quantity and the aboveground plant quantity of fine forage (P＜ 0.05), while the legume and weeds grasses increased slightly, but the difference was not significant (P＞ 0.05). Total coverage of grassland plants, The degree of coverage, the amount of underground plants and the soil water content decreased slightly, but the difference was not significant (P＜ 0.05). In soil nutrients, total potassium and available nitrogen increased slightly, but there was no significant difference in nitrogen (P＞ 0.05), while organic matter, total nitrogen, total phosphorus, available phosphorus and available potassium were not decreased significantly (P＞ 0.05).