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以大兴安岭杜香-兴安落叶松林为研究对象,分析渐伐中龄林木质物残体的贮量及组成,比较两类标准计算的粗木质残体贮量、径级结构及腐烂特征。结果表明:WD生物量为16.94t·hm-2,以Harmon标准计算的CWD(D≥2.5 cm)体积和生物量为35.45m3·hm-2,分别比LTER标准高出31.80%和34.70%。倒木在CWD中的密度比例(96.70%)远大于体积和生物量比例(56.24%,61.74%),枯立木比例最小。CWD密度以2.5-10cm为主(占96.7%),体积和生物量则以大于20 cm的CWD为主。CWD由白桦和落叶松组成,以落叶松为主,占67%以上。
Taking Dahurian - Xing’an Larix gmelinii forest in Daxinganling as the research object, the storage and composition of the tree debris residues in the middle - aged and the aged were analyzed. The stock, diameter structure and decay characteristics of coarse wood residues were compared by two kinds of standards. The results showed that the WD biomass was 16.94 t · hm-2, and the CWD (D ≥ 2.5 cm) volume and biomass calculated by the Harmon standard were 35.45 m 3 · hm-2, which were respectively 31.80% and 34.70% higher than the LTER standard. The density of inverted wood in CWD (96.70%) is much larger than that of biomass (56.24%, 61.74%) and the proportion of dead wood is the smallest. The CWD density is dominated by 2.5-10cm (96.7%), and the volume and biomass are dominated by CWD> 20cm. The CWD consists of birch and larch, dominated by larches, accounting for more than 67%.