Effect of gravel on artificial grassland biomass allocation in gravel-soil-taken field of hydroelectric project on the eastern Tibet Plateau
According to the urgent need for ecological environmental protection during the construction of Ru Mei hydropower station in the upper reaches of the Lan Cang River,we conducted a study on artificial vegetation restoration in gravel-soil-taken field.Gravels were placed in upper(GU,0-10cm),middle(GM,20-30cm)and deep(GD,40-50cm)layers of the backfill soil(unscreened and screened soils),grass species Elymus nutans Griseb was sown for establishing artificial grass,and community canopy and root biomass were monitored.The results showed that in the plots backfilled with unscreened soil,the aboveground biomass of community ranged as 136.5-526.7g·m-2,98.9-372.5g·m-2,and 79.8-373.2g·m-2 for the treatment with gravels placed in the surface,middle,and deep soil layers,respectively,while the root biomass ranged as 223.3-495.9g·m-2,140.5-460.lg·m-2,and 124.1-343.4g·m-2,respectively.In the plots backfilled with screened soil,the aboveground biomass ranged as 134.8-415.5g·m-2,88.3-288.9g·m-2,and 73.9-260.5g·m-2 for the treatments with gravels placed in the surface,middle,and deep soil layers,respectively,while the root biomass ranged as 180.1-431.4g·m-2,102.7-347.2 g·m-2,and 83.7-265.Og·m-2,respectively.Placing gravel in the soil surface layer can significantly increase the aboveground and root biomass of artificial grassland(P＜0.05).Our result revealed the effect of gravel on artificial grassland biomass allocation in gravel-soil-taken field on the eastern Tibet Plateau,which plays an important guiding role in vegetation restoration in subalpine and semi-arid degraded ecosystems.
artificial grasslandsubalpinevegetation restorationgrassland productivityarid region
NETL
NSTL
万方数据
