本文選題：高寒草原 + 暖季放牧��； 參考：《草業(yè)科學(xué)》2016年08期

【摘要】：基于青海湖北岸高寒草原連續(xù)3年放牧控制試驗,研究了暖季和冷季放牧草地植物群落特征的變化。結(jié)果表明,暖季和冷季放牧草地群落地上生物量均隨放牧強度的增加呈現(xiàn)下降趨勢,禾本科地上生物量的變化趨勢基本與群落地上生物量的一致;中度放牧對暖季放牧草地植被的影響程度高于冷季放牧草地;圍欄封育區(qū)和冷季重度放牧草地的優(yōu)勢種均為紫花針茅(Stipapurpurea)和矮嵩草(Kobresia humilis),暖季放牧各放牧小區(qū)和冷季放牧草地輕度和中度放牧處理優(yōu)勢種均為紫花針茅和披針葉黃華(Thermopsis lanceolata);隨放牧強度的增加,暖季放牧草地群落物種多樣性指數(shù)和均勻度指數(shù)表現(xiàn)出先降低后增加的趨勢,冷季放牧草地群落物種多樣性指數(shù)和均勻度指數(shù)表現(xiàn)出增加的趨勢,但是多樣性指數(shù)在暖、冷季放牧草地均以重度放牧區(qū)最高。
[Abstract]:Based on the grazing control experiments of alpine steppe on the northern shore of Qinghai Lake for three consecutive years, the changes of plant community characteristics of grazing grassland in warm season and cold season were studied. The results showed that the aboveground biomass of grazing grassland in warm season and cold season decreased with the increase of grazing intensity, and the change trend of aboveground biomass of Gramineae was basically consistent with that of community. The effect of moderate grazing on grassland vegetation in warm season was higher than that in cold season. The dominant species were Stipapurpurea (Stipapurpurea) and Kobresia humilis (Kobresia humilisus) in fenced area and heavy grazing grassland in cold season. The dominant species under mild and moderate grazing in warm season grazing areas and in cold season grazing grassland were Stipa lanceolata and lanceolus. Thermopsis lanceolataan; with the increase of grazing intensity, The species diversity index and evenness index of grazing grassland community in warm season decreased first and then increased, and the species diversity index and evenness index of grazing grassland community in cold season showed an increasing trend, but the diversity index was warm. The grazed grassland in cold season was the highest in heavy grazing area.
【作者單位】： 青海大學(xué)研究生院;青海省畜牧獸醫(yī)科學(xué)院;
【基金】：國家自然科學(xué)基金項目(30960074;31370469)
【分類號】：S812.8
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本文編號：1932554