【摘要】 在短花针茅荒漠草原,比较研究了不同放牧制度对群落现存量与营养物质动态的影响,结果表明,划区轮牧和对照区牧草现存量差异不明显,但高于自由放牧区。轮牧和对照区群落现存量变化呈先增加,然后又下降的动态规律,自由放牧植物现存量几乎一直呈下降趋势。与轮牧和对照区相比,自由放牧区牧草在生长初期粗蛋白质、粗灰分、磷的含量均较高,粗纤维含量较低,生长后期则相反。更多还原

【Abstract】 The response of the standing forages and nutrient dynamics of community to different grazing systems was studied on Stipa breviflora desert stepper. The results showed that no significant yield differences of standing forages were found in the rotational grazing area and in the closed area, which were all superior to the free stocking area. The standing forage productions in the rotational grazing area and in the closed area showed lowhighlow patterns, while a straight decline pattern was found in the free stocking area. Herbages in the free stocking area had higher contents of crude protein, crude ash, phosphorus, and lower content of crude fiber in the early growth stage, and lower contents of crude protein, crude ash, phosphorus and higher content of crude fiber in the late growth stage, in compared with the rotational grazing area and the closed area.更多还原