Evaluation of Artificial Restoration Effect in Alpine Damaged Coal Mining Area Based on OCVOR Optimization Model
In order to explore the effects of fertilization and soil covering on ecological restoration and the effects of soil available nutrients on ecosystem health in alpine mining areas,the ecosystem health assessment index(CVOR)was designed derived as OCVOR,VOR,CVOR and OCVOR index were used to assess and analyze the ecosystem health and restoration effects of artificial grassland in alpine mining areas under five different fertilization levels(0.0125 kg/m2,0.0375 kg/m2,0.1125 kg/m2,1-year no application of diammonium phosphate,5-year no application of diammonium phosphate)and three cover thicknesses(0,20-25,40-45 cm).The results showed that the evaluation results of the three indexes for different fertilization and soil covering measures tended to be consistent.Medium fertilization(0.0375 kg/m2)and thick soil covering(40-45 cm soil thickness)were the appropriate restoration measures in this region.On the whole,the ecosystem health levels and restoration effects of using soil cover measures were lower than those of fertilization measures.The evaluation results of OCVOR index showed that the ecosystem with moderate and heavy fertilization measures in the region was unhealthy and unconspicuous,while the ecosystem with light fertilization,1-year no fertilization,and thick soil covering was warning and poor,the ecosystem with moderate soil cover,no soil cover,and 5-year no fertilization measures was collapsing and very poor.Under 8 recovery measures,the VOR,CVOR,and OCVOR indices ranged from 0.18 to 0.95,0.02 to 0.30,and 0.05 to 0.41 respectively.The evaluation results of the OCVOR index were between the VOR and CVOR index.Compared with VOR and CVOR index,the OCVOR model was more objective and scientific,which was more consistent with the health status and restoration reality of the artificial grassland ecosystem in coal gangue mountains in alpine mining areas with greater damaged.
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