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Storage and characteristics of coarse woody debris in different aged natural Ledum palustre-Larix gmelinii forests in Daxing’anling Mountains of Northeast China.

WANG Fei1, ZHANG Qui-liang1**, WANG Bing1, BAO Ye2, GAO Xiao-wei1, LI Da-yong1, YE Dong-mei1   

  1. (1Forestry College, Inner Mongolia Agricultural University, Huhuohot 010019, China;2Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China)
  • Online:2012-12-10 Published:2012-12-10

Abstract: By using two kinds of criterions, this paper analyzed the species composition, diameter class structure, and decay class of coarse woody debris (CWD) in different aged Ledum palustre-Larix gmelinii forests in Daxing’anling Mountains of Northeast China, aimed to explore the characteristics and storage of the CWD. The density, volume, and biomass of the CWD derived from the Harmon criterion were 350-659 trees·hm-2, 2.64-38.27 m3·hm-2, and 1.13-8.52 t·hm-2, being 52.07%-92.38%, 17.44%-63.13%, and 16.88%-22.11% higher than those derived from the LTER criterion, respectively. With increasing stand age, the density of the CWD derived from the Harmon criterion exhibited a “U” distribution, and the volume and biomass of the CWD showed a near normal distribution, while the density of the CWD derived from the LTER criterion increased gradually from middle age forest, and the volume and biomass of the CWD decreased. The proportions of the density, volume, and biomass of the CWD at high decay class derived from the two criterions increased gradually with the increase of stand age. The decay classes of the CWD in young and middle aged forests were mainly of grades Ⅰ and Ⅱ, while those in nearmature and mature forests were of grades Ⅱ and Ⅲ. The population was composed of L. gmelinii and Betula platyphylla, and the CWD density, volume, and biomass of L. gmelinii occupied above 76%.