大兴安岭兴安落叶松原始林倒木养分含量研究

在大兴安岭兴安落叶松原始林内选择杜香-兴安落叶松林、草类-兴安落叶松林和杜鹃-兴安落叶松林3个典型林型,按照不同树种对倒木的养分含量进行了测定。依据现有的资料,结合研究对象实际,制定了大兴安岭兴安落叶松原始林落叶松和白桦倒木的腐朽等级划分标准。结果表明:不同林型内不同树种倒木有机C、全K、全Na,以及Ca和Mg的含量随着倒木的不断分解均没有明显的变化规律;全N含量均有增加的趋势;全P均保持相对稳定。对3个林型内兴安落叶松倒木的各养分含量之间进行对比,有机C、全K、全P百分含量均为杜鹃-兴安落叶松林﹥草类-兴安落叶松林﹥杜香-兴安落叶松林;全N、全Na和Ca百分含量均为杜鹃-兴安落叶松林﹥杜香-兴安落叶松林﹥草类-兴安落叶松林;Mg百分含量为草类-兴安落叶松林﹥杜鹃-兴安落叶松﹥杜香-兴安落叶松。

Daxing'anling Larix Regeneration of Fallen Tree Nutrient Content Research

In the original forest,three typical forest types are selected as Ledum Larch,Grass Larch and Rhododendron Larch and the different species nutrient content was determined.Based on the existing material combined with the research object and the greater hinggan sing-an larch and three birch wood decadent hierarchy standards are formulated.The results show that different types of different tree species in organic C,all the K,all the Na and Ca,Mg,of content with the wood constantly decomposition are but no significant changes in law;All the N content is in a trend of increase.The all the P remained relatively stable.For three types of wood in larch fall,the nutrient contents are compared,and Organic C,all the K,and all the P percentage content of leaves are the Rhododendron Larch > Grass Larch > Ledum Larch leaves pine;All the N,all the Na and Ca percentage content of Rhododendron Larch > Ledum Larch > Grass Larch;Mg percentage content of the Grass Larch﹥Rhododendron Larch > Ledum Larch.