Effects Of Fertilizer Application On Degenerative Meadow Community Characteristics At Maqu

To explore scientific restoration way of degraded grassland at Maqu county, Gansu province, effects of fertilizer on vegetation characters of degraded alpine grassland were studied by district fertilization experiment, Several aspects were concerned– height of vegetation, coverage, richness, the aboveground biomass, biological diversity. Though, the roles of different treatments on improving degraded grassland were evaluated, the results were as follows:(1)Compared with the non-fertilizer control plots, organic manure + phosphate processing could increase the total aboveground biomass of vegetation and the biomass of legumes and sedges.Not only the relative biomass of legumes and sedges were increased but also the biomass and relative biomass of weeds were reduced by organic manure + phosphate treatment. From the socio-economic point of view,to inprove the aboveground biomass and the proportion of fine pasturage, organic manure + phosphate processing was the better treatment,however, from the perspective of the conservation of biological diversity,organic manure treatment was the best treatment, the two objectives can not be achieved at the same time.(2)Compared with the non-fertilizer control plots, not only the average height of vegetation and the coverage of grass were significantly increased, but also the coverage of weeds was significantly reduced by nitrogen + phosphate fertilizer treatment. From the ecosystem landscape benefits point of view, nitrogen + phosphate processing was optimal treatment.(3)Only just from the plot received phosphate + organic manure, diversity index and the ground biomass had obvious linear relationship; and from plots received non-fertilizer, phosphate, nitrogen + phosphate treatment, diversity index and the ground biomass had obvious negative correlation.