The Construction Of Indicator System For Desert-steppe Ecological Monitoring In Eastern Inner Mongolia

Desert-steppe occupies an important position in Inner Mongolia grassland. It is not only the natural grassland for grazing, but also served as a barrier to protected ecological safety of the north. In this paper, we investigated the eastern Desert-steppe of Inner Mongolia(Damao county、Siziwang county、 Suniteyou county、Sunitezuo county) and screened 10 first-class indicators and 53 second-class indicators so as to construct a scientific and reasonable system for evaluating the Desert-steppe ecological monitoring. On the other hand, we also expected that this system will provide a theoretical basis for our evaluation of Desert-steppe ecological environment and reasonable utilization of grassland resources and restorement the damaged ecological environment. Bsed on the principle of indicator system construction, theoretical analysis and frequency statistics methods were used to select the indicator system. Then, variation coefficient method, simple correlation coefficient method and the principal component analysis methods were used to optimize the indicators system. Finally, the weights of all indicators were determined by analytic hierarchy process and entropy-right method. And then, we elvaluated ecological environment quality of the studied area by using comprehensive evaluation method. The mainly results were as follows:(1) Among the 10 first-class indicators,4 indicators were screened to evaluate the Desert-steppe ecological monitoring as first-class indicators. The ranks of indicators weights are meteorology> soil> vegetation> pressure, with the value of 0.361,0.280,0.226 and 0.133, respectively.(2) Among the 13 meteorology indicators,5 indicators were screened to evaluate the Desert-steppe ecological monitoring as second-class indicators. The ranks of indicators weights are precipitation> temperature> evaporation> humidity> sunshine hour, with the value of 0.361,0.226,0.159,0.148,0.106, respectively.(3) Among the 17 vegetation indexes,7 indicators were screened to evaluate the Desert-steppe ecological monitoring as second-class indicators. The ranks of indicators weights are vegetation coverage> vegetation composition> dry weight of ground litters> number of constructive species> total yield of hay> grass group height> plant frequency, with the value of 0.194,0.176,0.149,0.146,0.137,0.100, 0.098, respectively.(4) Among the 16 soil indexes,6 indicators were screened to evaluate the Desert-steppe ecological monitoring as second-class indicators. The ranks of indicators weights are organic matter> available potassium> total nitrogen> soil erosion> total phosphorus> soil moisture, with the value of 0.222,0.192,0.179,0.171, 0.144,0.092, respectively.(5) Among the 7 pressure indexes,5 indicators were screened to evaluate the Desert-steppe ecological monitoring as second-class indicators. The ranks of indicators weights are grazing intensity> drought disaster occurrence area> pest occurrence area> rodent occurrence area> snow disaster occurrence area, with the value of 0.403,0.183,0.152,0.150,0.112, respectively.(6) Siziwang county and Damao county belong to the second grade region, the eco-environment quality is in good condition. Sunitezuo county and Suniteyou county belong to the third grade region, the eco-environment quality is in general condition.