关键词: 低质林, 采伐方式, 枯落物, 持水性能

Abstract:

Litter amount and the water-holding characteristic of litter layers were analyzed after logging in low-quality forests in Lesser Khingan Range with different logging styles. The results showed that: the litter amount and the maximum water-holding capacity of the nondecomposed litter were greater than the semi-decomposed litter in the horizontal clear-cutting zone. At 10th mether of band width, the litter amount was the largest, but there nosignificant difference in the maximum water holding capacity. The litter amount and the maximum water-holding capacity of the non-decomposed litter were greater than the semi-decomposed litter in the vertical clear-cutting zone, but there was no significant difference in the litter amount and the maximum water-holding capacity between different band widths. The litter amount and the maximum water-holding capacity was large in the light selective-cutting zone. The total amount of litter was 20.68,10.73,13.34,1.49 t·hm^-2 in the horizontal clear-cutting zone, the vertical clear-cutting zone, the selective -cutting zone and the check zone, and the maximum water-holding capacity was 45.25,81.68,29.58，75.56 t·hm^-2. The order of the total litter amount was: the check zone＞the horizontal zone＞the selective-cutting zone＞the vertical zone, the nondecomposed litter: the horizontal zone＞the check zone＞the selective-cutting zone＞the vertical zone, the semi-decomposed litter: the check zone＞the selective-cutting zone＞the horizontal zone＞the vertical zone; The order of the maximum water-holding capacity was: the vertical zone＞the check zone＞the horizontal zone＞the selective-cutting zone, the nondecomposed litter: the vertical zone＞the check zone＞the horizontal zone＞the selective-cutting zone, the semi-decomposed litter: the check zone ＞the vertical zone＞the horizontal zone＞the selective-cutting zone. As time went on water-holding capacity of litter increased, however water absorption speed reduced. In summery Logging operations had a greater disturbance on the litter water-holding properties，but the vertical clearf-cutting and the low cutting intensity were able to effectively reduce the impact of logging in terms of hydrological function of litter.

Key words: low-quality forest stands, logging style, litter, water-holding characteristic