大兴安岭呼中林区火烧迹地粗木质残体特征

对大兴安岭呼中林区不同年份火烧迹地的粗木质残体特征进行了研究.结果表明：呼中林区火烧迹地粗木质残体贮量在24.87～180.98 m³·hm^-2，其中倒木和枯立木分别为6.03～93.91 m³·hm^-2和15.29～138.37 m³·hm^-2，且不同年份火烧迹地之间差异显著；倒木、枯立木所占比例分别为24.26％～86.00％和14.01％～75.4％，且不同年份火烧迹地之间差异显著；倒木和枯立木的优势径级分别为2.50～20 cm和1.50～15 m, 优势长度分别为2.50～15 cm和5～20 m；随着火烧迹地的恢复,粗木质残体贮量的动态变化不明显.粗木质残体特征与火前林分条件和火烧强度密切相关.

Characteristics of coarse woody debris in Huzhong area of Great Xing'an Mountains

An investigation was made on the coarse woody debris (CWD) in burned f
orestlands in Huzhong area of Great Xing’an Mountains. The loading capacity of
CWD in the burned forestlands was 249〖KG-*2〗-〖KG-*7〗1810 m3·hm-2
, among which, snag and log occupied 243％〖KG-*2〗-〖KG-*7〗859％ and 14.
0％〖KG-*2〗-〖KG-*7〗757％, being 60〖KG-*2〗-〖KG-*7〗939 m3·hm-2
 and 153〖KG-*2〗-〖KG-*7〗1384 m3·hm-2, respectively. Significan
t differences were observed among burned forestlands and among years. The predom
inant DBH class of snag and log was 25〖KG-*2〗-〖KG-*7〗20 c
m and 15〖KG-*2〗-〖KG-*7〗15 m, and the height of most snags and logs was
25〖KG-*2〗-〖KG-*7〗15 m and 5〖KG-*2〗-〖KG-*7〗20 cm, respectively. The loa
ding capacity of CWD had no obvious change with the recovery of forest vegetatio
n. The characteristics of CWD had a close relationship with pre-fire forest sta
nd conditions and burn intensity.