Abstract:Based on plot data of shoot utilizing (Ⅰ),shoot and timber utilizing (Ⅱ) and timber utilizing (Ⅲ) of Phyllostachy edulis forests located at the hilly region in central Hunan,studies were carried out to investigate the vertical distribution,seasonal dynamics of soil hot water-extractable carbon(HWC) concentrations and storages in these three typical managing target patterns and its relationship with soil temperature and moisture.The results showed that the average HWC concentrations of type Ⅰ,Ⅱ and Ⅲ were 21.59-84.54,21.41-58.95 and 24.70-61.58 mg/kg,respectively.The average HWC storages were 0.14-0.53,0.14-0.41 and 0.15-0.37 t/hm2,respectively.HWC concentrations and storages decreased with the increase of soil depth in three forests,moreover,the soil layers of 0-20 cm were the main distribution of HWC.For seasonal dynamics,HWC concentrations and storages were the highest in January and the lowest in October.HWC was negatively correlated with the soil temperature and moisture.The relationship could be described well by cubic polynomial and growth curve.It was obvious to some extent for HWC decomposition and mineralization aggravating with the rise of soil temperature and moisture.