研究了黄土区白草群落6月和7月的生物量，测定结果：6月和7月地上生物量分别为90.97g/m2和95.02g/m2，地下生物量为324.00g/m2和452.61g/m2。

• The biomass of P.flaccidum community in June and July was studied. The result showed that the aboveground biomass in June and July was 90.97 g/m 2 and 95.02 g/m 2 respectively; the underground biomass was 324.00 g/m 2 and 452.61 g/m 2 respectively.