山西高原三种白羊草群落的生物量研究

Biomass of three Bothriochloa ischaemum communities at the loess plateau of Shanxi province

用收获法对山西省的3种白羊草群落的生物量进行了研究。结果表明,3种群落的总生物量分别为496.61、283.54、和139.05g/m2。3种群落的地下部分生物量大于地上部分生物量。各群落优势种白羊草的生物量占群落地上部分、地下部分和总生物量的比例均大于70%。通过对群落特征、干鲜重比率以及群落生物量的综合分析得出,水因子是影响白羊草群落组成和生物量的主导因子。另外,对牧草种类和生物量构成的分析得出,白羊草群落是优等的草地群落。

The biomass of three Bothriochloa ischaemum communities at the Loess plateau of Shanxi province was investigated by the harvest method. The results showed that the biomass of three communities were 496.61 g/m2, 283.54  g/m2 and 139.05  g/m2 respectively. The underground biomass of the three communities was bigger than the aboveground. The biomass of Bothriochloa ischaemum, the dominant species in the three communities, accounted for 70% of each community, whether its the total, the underground or the aboveground biomass. Water condition is the most important factor which affected the composition and biomass of the Bothriochloa ischaemum communities, according to the analysis of the community characteristics, the ratio of dry/fresh weight and the biomass of the communities. In addition, it could be concluded that the Bothriochloa ischaemum community created excellent grazing grassland in North China.