In this study, storage and composition of fallen wood were investigated by sampling in a fixed area plot in a natural secondary Pinus tabulaeforims forest at Huoditang forest region in the Qinling Mountains. The fallen wood mass in the region was 8. 25 t · hm-2, of which P, tabulaeformis and Toxicodendron vernicifluum accounted for 69. 58% and 30.42% , respectively. The storage of fallen wood investigated according to an international classification showed that the storage of decay class Ⅱ was dominant, accounted for 42.06% of the total, and the storage of decay class V accounted for only 8% . The relationship of density and decomposition was simulated by monomial exponential attenuation model, and the decomposition constant of P. tabulaeformis fallen wood was 0.039 93 (R2 = 0.981 78) , while that of T. vernicifluum fallen wood was 0.045 33 (R2 =0.982 68). The monomial exponential attenuation model predicted that it would take 17 and 75 years to decompose 50% and 95% of P. tabulaeformis fallen wood, and take 15 and 66 years to decompose 50% and 95% of T. verncifluum fallen wood.
展开▼
