When out in the countryside he loves to closely observe saprophytic fungi growing on dead wood. Chang explains that fungi can be broadly divided into parasitic (feeding on living organisms), saprophytic (feeding on dead organic material) and symbiotic types. The roots of 95 % of all land plants live in a symbiotic-i.e.
研究真菌的他表示，真菌可以粗分為寄生、腐生與共生菌，百分之九十五的陸生植物根部都伴有共生真菌，彼此形成菌根，互相依賴，共生共榮。