放牧对锡林郭勒典型草原退化影响初探

文章利用1952-2006年实际调查资料对围封和放牧条件下典型草原地上生物量、植物群落组成、数量特征、土壤含水量等进行对比分析,结果表明:与围封样地比较,放牧草场土壤下层水分明显减少,0～100cm土层水分减少12.5mm;植被生产能力下降,羊草和针茅的高度分别下降4.2％和5.2％,生物量减少14.9％和32.1％,群落总生物量下降29.2％,LAI减小22.2％.群落组成结构发生变化,多样性指数降低14.8％,退化现象比较明显.

Discussion on the Influence of Pasturing on Degradation of Typical Grassland in Xilin Gol League

Using the actual survey data,the overground biomass,plant community composition,quantitative characteristics,soil water content of enclosure and grazing grassland were compared and analyzed,the results showed that: with the enclosed sample comparison of grazing grassland,soil moistures was reduced obviously,0-100 cm soil moisture reduction of 12.5mm;vegetation production capacity of Leymus chinensis and Stipa,height drops respectively 4.2% and5.2%,biomass decreased14.9% and32.1%,the community total biomass decreased 29.2%,22.2% reduction of LAI.Community composition and structure change,diversity index decreased 14.8%,degradation phenomenon more obvious.