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通过设置不同放牧处理(羊单牧、牛单牧、牛羊混合放牧和不放牧),研究土壤氮素和优势种克氏针茅根系构型对不同放牧方式的响应。结果表明:放牧14个月后(约2个生长季),牛单牧和牛羊混合放牧显著提高了10~20 cm土层土壤全氮含量,其中牛单牧提高了硝态氮含量,而牛羊混合放牧则以提高有机氮为主;不放牧区的克氏针茅地上生物量显著高于羊单牧、牛单牧和混合放牧区,而地下生物量差异不显著;在放牧处理14个月后,克氏针茅6项根系构型参数5项没有差异,但根系径级分级显示,不放牧区根系直径为2.5~3.5及4.0~4.5 mm的根系长度、体积和表面积显著高于其他放牧区。整体上看,放牧处理14个月,土壤和优势种植物的根系构型参数变化尚不明显,有待于继续观测。
Through setting different grazing treatments (Shepherd sheep, cattle herding, cattle and sheep mixed grazing and no grazing), the responses of soil nitrogen and dominant species Kirschnerla spp. To different grazing patterns were studied. The results showed that after 14 months of grazing (about 2 growing seasons), the mixed grazing of cattle herding and cattle and sheep significantly increased the soil total nitrogen content in 10-20 cm soil layer, of which, In the mixed grazing of cattle and sheep, the organic nitrogen was dominant. The aboveground biomass of Kirschner concentration in the non-grazing area was significantly higher than that in the sheep herding single cattle, cattle single herd and mixed grazing area, but the difference in underground biomass was not significant. After 6 months, there were no differences in the root architecture parameters among the six root systems. However, the root diameter grading showed that the root length, volume and surface area of root systems with diameter of 2.5-3.5 and 4.0-4.5 mm were significantly higher than those without grazing Other grazing areas. On the whole, the changes of the root configuration parameters of soil and dominant species are not obvious until 14 months of grazing treatment, which needs to be observed continuously.