不同林龄油松林枯落物水文特性

In order to quantitatively describe the differences in the water-holding capacity of litter of Pinus tabuliformis forests of different ages in the mountainous areas of northern Hebei Province and the correlation between indicators.Litter of P. tabulaeformis forest at three different stand ages (20a, 30a, 41a) were investigated, including thickness of undecomposed layer, semi-decomposed layer and litter accumulation, to analyze the correlation between response of litter water retention characteristics in time dimension and the litter water conservation capacity indexes. The results showed that the total litter thickness was 4.43-6.23 cm and the litter volume was 27.74-35.96 t hm-2, the litter thickness and accumulation were significantly different from the age of the forest. In order to investigate the water holding capacity of litter layers of Pinus tabulaeformis forest of different ages in the northern mountainous region of Hebei Province. The instantaneous water holding capacity of litter increased rapidly at 0.25 h and gradually became stable with time, which showed a logarithmic relationship with immersion time, with R2 ranging between 0.9858 and 0.9922, and the comparison results of instantaneous water holding capacity of litter layers was 41a>30a>20a. The water absorption rate of litter reached a maximum value at 0.25 h and then gradually approaches zero, which showed a power function relationship with the immersion time, with R2 ranging between 0.8383-0.9407, and the comparison results of water absorption rate of each litter layer was 41a>30a>20a. The natural water retention rate of total litter layer was 31a>20a>40a. The maximum water holding capacity of total litter in different ages of P. tabulaeformis was 43.52-56.48 t hm-2. The maximum storage and effective storage of total litter layer of each forest age showed an increasing trend with the increase of the stand ages, the maximum storage was between 33.78-44.41 t hm-2, and the effective storage capacity was between 27.25-35.931 t hm-2. There is a strong correlation between the retention capacity of litter and the water retention capacity of litter, and there is a complex interaction between the other functional factors of litter water conservation.