施肥草地刈割和放牧利用的研究

Studies on Grass Mowing and Grazing in Fertilized Grassland.

对黄土丘陵区的退化天然草地进行施肥处理，研究施肥草地在刈割、放牧利用下以种群生物量的季节动态和年动态的变化规律。为选择该地区最适宜的刈割期、刈割次数和放牧强度以及放牧次数对群落结构的影响提供理论依据。结果表明，在黄土丘陵干草原类型区，长芒草、百里香群落每年刈割两次（６月１５日、８月１０日），留茬高度４ｃｍ有利于草地的繁殖更新及个体形成。每年放牧两次（６月１０日、８月１０日），放牧强度每公顷１５只羊。

To deal with the natural grassland degeneration in the loess hilly area, the fertilizing experiments have been done, which included the studies on variation trends of community ,s biomass along with seasons and years under mowing and grazing conditions. It provided a base for selecting proper mowing periods and times, grazing intensity and times to affect community ,s structure. The results showed that to the communities of Stipa bungeana and Thymus mongolicus in the loess hilly area, it would be better to be mowed twice (June 15 and August 10) with 4cm height of grass left and be grazed twice a year (June 10 and August 10) with grazing intensity of 15 sheep within one ha, which could be benefical to grasses reproduce and vegetation ,s normal succession.