Health Assessment Of Robinia Pseudoacacia Plantation In Weibei Loess Plateau

Firstly, this paper has theoretically analyzed and discussed the ecosystem health's concept, connotation and research under progress, the 12 indicators for forest health assessment, which are composed of site factor, organization, biodiversity and stability of the forest ecosystems was studied and applied to assess forest health in this study.Secondly, a grey relation projection model for ecosystem health assessment was established based on grey system theory and vector projection principle. In this model, evaluated samples and classified standards are treated as vectors, and projected on the same ideal sample. Then, evaluated samples are classified and arranged in the projective value.Finally, according to the investigation data of 79 R. pseudoacia forest in Yongshou, Fufeng and Baishui areas assessment index system of ecological health was established using grey relation projection method to assess the ecological health status. In Yongshou,the ill healthy condition forest sub compartments account for the proportion in a big way,50%,the healthy condition forest sub compartments account for the proportion to be smallest, 15.38%,the sub health condition forest sub compartments account for the proportion 34.62%. In Fufeng,the healthy condition forest sub compartments account for the proportion in a big way,44.83%,the sub healthy condition forest sub compartments account for the proportion to be smallest,17.24%,the ill health condition forest sub compartments account for the proportion 37.93%. In Baishui,the sub healthy condition forest sub compartments account for the proportion in a big way,41.67%,the ill healthy condition forest sub compartments account for the proportion to be smallest,25%,the health condition forest sub compartments account for the proportion 33.33%Because the ill health forest of sub compartments is more in Weibei Loess Plateau, the forest in Weibei Loess Plateau is in the condition of ill health.