大兴安岭兴安落叶松与白桦倒木腐朽等级对微环境的影响

Effects of Decay Level of Fallen Trees on Microenvironment in Larix gmelinii and Betula platyphylla Forests in The Greater Xing'an Mountains

对大兴安岭兴安落叶松林中的兴安落叶松、白桦倒木分解腐烂过程中对土壤温度、动植物种类以及对森林的更新作用等内容进行了调查和分析。结果表明:随着腐朽程度的增加,倒木附近土壤的表层温度逐渐降低,即越是腐朽和分解彻底的倒木,其附近的土壤温度就越低;其中,I级到Ⅲ级间的降幅较大,Ⅲ级以后趋于平稳;倒木腐朽等级决定着营腐生生物在其体内或生长在其周边的生物类型。

The soil temperature, kinds of animal and vegetation and the regeneration role of forest have been investigated and analyzed during decomposition and decay of fallen trees of Larix gmelinii and Betula platyphylla in the Greater Xinghn Mountains. The results show that the surface temperature of soil near fallen trees decrease gradually with the increase of the decay level, which the nearby soil temperature becomes lower with the thorough decay and decomposition of fallen trees. There is a big decreasing range between the first level and the third level, which becomes stable after the third level. The decay level of fallen trees decide the biological types of saprobe in vivo or growing nearby.