Abstract:

The paper established a diagnosis distinguishing system by synthetic indices using distinguishing analysis method firstly, and used this method to diagnose the nutrient situation of Castanea henryi plantation in different yield types based on the measuring and analysis of five main nutrient elements in leaves. There were different correct distinguishing rates in different type dividing method by using distinguishing analysis of one dimension, which were 100% both for high yield type and middle yield + low-yield type while being 88.33% and 86.67% for high yield + middle-yield type and low-yield type respectively when dividing into two types. When dividing into three type (high, middle and low yield), their correct distinguishing rates were 100%, 86.70% and 83.33% respectively by using distinguishing analysis of one dimension but were 100%, 100% and 83.33% respectively by using distinguishing analysis of two dimensions. So, type dividing and dimensions of distinguishing function are two important factors affecting the results of distinguishing diagnosis analysis.

Key words: Castanea henryi plantation, Nutrient, Synthetic indices, Distinguishing diagnosis