During pile-fermenting,thecolor of appearance changed from yellow green to yellow brown or blackbrown due to the declining ratio of Chl/Car and Chl/Phy.

• 渥堆期间,由于 Chl/Car 和 Chl/Phy 之比值不断下降,使得外形色泽由黄绿转变成黄褐色或黑褐色。