Effects of Fertilization and Reseeding on Biomass and Species Diversity of Patchy Degraded Alpine Meadows with Different Slope Directions
It is of great significance to explore the effective artificial restoration measures for the degraded alpine meadow in the source region of the Yellow River.This study conducted an interactive treatment experiment with different organic fertilizer application rates and different reseeding rates to analyze alpine meadows with different slope directions,in order to screen the optimal combination of fertilizer application and reseeding rates suitable for effective restoration in the region.The results showed that:(1)Fertilization and reseeding treatments can both enhance the aboveground and belowground biomass of plants in patchy degraded alpine meadows,but the promoting effect on plant species diversity was not obvious.(2)The effects of fertilization and reseeding on the grassland biomass and species diversity vary depending on the slope direction of on sunny and shady slopes.(3)The suitable restoration measures for the patchy of degraded alpine meadows distributed on the sunny slope beach was organic fertilizers 150 g/m2+Elymus nutans 0.75 g/m2+Festuca sinensis 0.375 g/m2+Poa crymophila 0.375 g/m2,and the suitable restoration measures for the shady slope beach was Elymus nutans 1.5 g/m2+Festuca sinensis 0.75 g/m2+Poa crymophila 0.75 g/m2.(4)Overall opposite correlation between biomass and species diversity on sunny slope compared to shady slope during restoration process of the patchy degraded alpine meadow.It is concluded that the slope environment should be considered in the ecological restoration of patchy degraded alpine meadow.
Alpine meadowPatchy degradationSlope aspectEcological restorationSpecies diver-sityBiomass of grassland
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