关键词: PI, MPI, 土壤生产力, 东北黑土区

Abstract:

【Objective】 Investigate a simple and practical method for soil productivity assessment in Northeast black soil regions of china. 【Method】 The research based on soil Productivity Index model(PI for short). Firstly, 8 kinds of physico-chemical properties had been chosen base on the Characteristics of research area, cluster and correlation analysis had been done to 8 kinds of physico-chemical properties of 120 soil samples from 25 black soil local type. Subsequently, parameter index were calculated with existing findings. Modify Productivity Index (MPI) which suitable to apply in research regions was gained finally. And simulated results were compared with crop yield of these soil profiles. 【Result】 The results showed that the suitable parameters for soil productivity assessment in Northeast black soil regions were soil available water, soil pH, clay content and Organic Matter content，compared with original PI，MPI expanded clay content and Organic Matter content parameters, condensed bulk density parameter ; The verification result indicated that the validation of MPI was better than PI’s, there were high significant correlation between MPI index and unit yield of maize, the equation was: Y = 3.1275 ln (MPI) + 10.052, with R2=0.7564.【Conclusion】 The analysis results show that PI is a good model for such study as soil productivity assessment in the research area.

Key words: PI, MPI, soil productivity, Northeast black soil regions