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以大兴安岭草类-兴安落叶松林为对象,通过分析不同龄林粗木质残体(CWD)的物种组成、径级结构及腐烂等级,揭示了CWD的基础特征及贮量。结果表明:CWD密度、体积和生物量分别为400～1 650株.hm-2、6.73～203.09 m3.hm-2和3.45～104.33 t.hm-2。随着林分林龄的增加,CWD密度逐渐减少,体积和生物量均从幼龄林开始增加,到成熟林时达到高峰后开始下降。随着林分林龄的增加,高腐烂等级的CWD体积和生物量比例逐渐增加,幼中龄林和近熟林以Ⅰ～Ⅲ级腐烂为主,成过熟林以Ⅳ～Ⅴ级腐烂为主。随着径级的增加,CWD体积和生物量比例在中龄林先增加后降低,在近熟林、成熟林和过熟林中有逐渐增加的趋势。群落由兴安落叶松和白桦构成,兴安落叶松CWD在数量、体积和生物量上均占74%以上。
Taking the Larix gmelinii-Larix gmelinii forest in the Greater Xing’an Mountains as an example, the basic characteristics and storage of CWD were revealed by analyzing the species composition, diameter structure and decay grade of coarse woody debris (CWD) in different age groups. The results showed that the density, volume and biomass of CWD ranged from 400 to 1650.hm-2,6.73 to 203.09 m3.hm-2 and from 3.45 to 104.33 t.hm-2, respectively. With the increase of forest stand age, the density of CWD gradually decreased, and both the volume and the biomass increased from the young forest to the mature forest and then began to decline. With the increase of forest stand age, the CWD volume and biomass proportion of high decay grade gradually increased. The young middle-aged and nearly mature forests were dominated by grade Ⅰ ~ Ⅲ decay, and the grade Ⅳ ~ Ⅴ decay of mature forest was the Lord. With the increase of diameter class, the volume and biomass of CWD decreased and then decreased in the middle-aged forest, and gradually increased in nearly mature forest, mature forest and over-mature forest. The community is composed of Larix gmelinii and Betula platyphylla, and CWA of Larix gmelinii is more than 74% in quantity, volume and biomass.