丰林自然保护区阔叶红松林粗木质残体研究

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20×20m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75.1m³·hm^-2,其中倒木,枯立木和树桩的贮量分别为.24 m³·hm^-2,2.03m³·hm^-2和7.34m³ ·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4%)和0-10cm(45%);倒木和枯立木的优势长度范围分别为0-5m (%)和m-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(2%)腐烂等级上.

Study on coarse woody debris in broadleaved-Korean pine forest of Fenglin National Natural Reserve

Coarse woody debris(CWD)is an important component in forest ecosystems and has a significant contribution to the maintenance of forest ecosystem health.A total of 17 plots each with 20 m×20 m in size were typically located and sampled throughout the Fenglin National Nature Reserve.Storage,diameter,length,and decay rank of CWD in broadleaved-Korean pine forest were investigated.The results are as follows.(1)The CWD storage of broadleaved-Korean pine forest amounted to 75.61 m³·hm^-2,of which down logs,snags,stumps were 66.24 m³·hm^-2,2.03 m³·hm^-2,and 7.34 m³·hm^-2,respectively.(2)The dominant diameter classes of down logs and snags were 11-20 cm(46%,of total CWD in quantity) and 0-10 cm(45%),respectively;the dominant length classes of down logs and snags were 0-5 m(66%) and 6-10 m(49%),respectively.(3)The distribution of decay classes of CWD presented approximately normal distribution,and mainly concentrated on classes Ⅱ(28%),Ⅲ(35%),and Ⅳ(26%).