不同海拔高寒草甸地下生物量分配格局研究

Distribution Pattern of Underground Biomass in Alpine Meadow with Different Altitudes

本研究以西藏林芝市巴宜区和那曲地区比如县、那曲县高寒草甸为对象,对不同海拔高寒草甸地下生物量分配格局进行定量分析。结果表明:(1)随着海拔的升高,高寒草甸地下生物量逐渐增大。(2)不同深度高寒草甸地下生物量从表层至底层逐渐递减,呈"T"形分布且0～5 cm土层的地下生物量分别占总地下生物量的53%、75%和65%。(3)不同深度高寒草甸0～5 cm、5～10 cm、10～15 cm地下生物量随着海拔的升高均呈现不同层度增加。

In this study, the alpine meadows in BaYi District and Biru County, Nagqu County Tibet were selected as the objects, and the distribution pattern of underground biomass in alpine meadows at different altitudes was quantitatively analyzed. The results showed：（1）the underground biomass of alpine meadows gradually increased with elevation;（2）the underground biomass of alpine meadow in different depths gradually decreased from the surface to the bottom, and the underground biomass of 0-5 cm soil layer accounted for 53%, 75% and 65% of the total underground biomass, respectively;（3）the underground biomass of 0-5 cm, 5-10 cm and 10-15 cm in different depth alpine meadow showed different degrees of increase.