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粗木质残体(CWD)是森林生态系统的重要组成部分,对维持森林生态系统健康具有不可忽视的贡献。采用典型取样法在黑龙江丰林国家级自然保护区设置了17块20X20m的标准样地,拟对保护区内阔叶红松林中粗木质残体的贮量、形态组成、直径、长度及腐烂度等特征进行研究。研究结果表明:(1)CWD总贮量为75.61 m~3·hm~(-2),其中倒木,枯立木和树桩的贮量分别为66.24 m~3·hm~(-2),2.03 m~3·hm~(-1)和7.34 m~(-1)·hm~(-2)。(2)倒木和枯立木的优势径级范围分别为11cm～20cm(占CWD总数的46%)和0-10cm(45%);倒木和枯立木的优势长度范围分别为0～5m(66%)和6m-10m(49%)。(3)CWD腐烂度呈近正态分布,且主要分布在Ⅱ(28%),Ⅲ(35%)和Ⅳ(26%)腐烂等级上。
Coarse woody debris (CWD) is an important part of forest ecosystem and has a significant contribution to maintaining the health of forest ecosystems. Seventeen standard plots of 20 × 20 m were set up in Fenglin National Nature Reserve of Heilongjiang Province using typical sampling methods. The stock, morphological composition, diameter, length and decay degree of coarse woody debris in the broad-leaved Korean pine forest in the protected area And other characteristics of the study. The results showed that: (1) The total CWD storage was 75.61 m ~ 3 · hm -2, in which the stocks of fallen trees, dead trees and stumps were 66.24 m 3 · hm -2 and 2.03 m respectively ~ 3 · hm ~ (-1) and 7.34 m ~ (-1) · hm ~ (-2), respectively. (2) The dominant diameter ranges of fallen and dead trees range from 11 cm to 20 cm (accounting for 46% of the total CWDs) and 0 to 10 cm (45%), respectively. The dominant lengths of fallen trees and dead trees range from 0 to 5 m (66% ) And 6m-10m (49%). (3) The rotten degree of CWD was near normal distribution and mainly distributed on the decay level of Ⅱ (28%), Ⅲ (35%) and Ⅳ (26%).