不同海拔梯度高寒草甸生物量变化

BIOMASS CHANGES OF ALPINE MEADOWS WITH DIFFERENT ELEVATION GRADIENTS

采用样方法分析了3881 m、4063 m、4160 m、4355 m、4379 m和4450 m 6个海拔梯度高山嵩草(Kobresia pygmaea)草甸形态指标和生物量变化.结果表明:海拔高度为3881 m时,株高达到最大值,为15.33 cm;海拔高度为4160m时,物种数则为最大值(11种);海拔高度为4063 m时,高寒草甸牧草鲜重、可食牧草鲜重、牧草干重和可食牧草干重均为最大值,分别为8013.33、7800、2673.33和2596.67g/m2,显著高于其它海拔梯度(P≤0.05).物种数和毒杂草物种数与牧草鲜重、牧草干重呈显著正相关(P≤0.05).

The morphological indexes and biomass changes of the Kobresia pygmaea meadow in 3881,4063,4160,4355,4379 and 4450 m 6 elevation gradients were analyzed by sample method.It turns out,at the altitude of 3881 m.Maximum plant height,15.33 cm.At 4160 m altitude.The maximum number of species(11 species).At 4063 m altitude.The fresh weight of alpine meadow,the fresh weight of edible forage,the dry weight of forage and the dry weight of edible forage are all the maximum,8013.33,7800,2673.33 and 2596.67 g/m^(2),respectively significantly higher than other elevation gradients(P≤0.05).species number and poisonous weed species number were significantly positively correlated with forage fresh weight and forage dry weight(P≤0.05).