【摘要】 本文通过对我国典型寒温带兴安落叶松林区的原始林、皆伐林、原始湿地3种生态系统冻土中硒元素含量以及影响硒元素含量因素的研究,为了解大兴安岭林区兴安落叶松林(原始林、皆伐林)和原始湿地冻土中的养分状况,以及硒元素含量对兴安落叶松生长发育的影响提供资料。结论如下:①3种生态系统冻土中硒元素含量范围0.010mg/kg~0.208mg/kg,有机质含量范围14g/kg~240g/kg;②对冻土中硒元素含量的影响程度由大到小的因素为土壤层次、生态系统、坡向和坡位;③硒元素含量表层最高,向下含量逐渐减少;④3种生态系统硒元素含量由高到低的顺序为原始湿地、原始林、皆伐林,坡向和坡位对硒元素含量影响不显著。更多还原

【Abstract】 The content of Se and the factors influencing the content of Se in permafrost of the virgin forest,the clear cutting forest and the virgin everglade of the area of Larix gmelinii forest in topical cold temperate zone in China were studied.The results as the follows:①In three ecosystems,the content of Se is 0.010mg/kg~0.208mg/kg and the content of organic matter is 14mg/kg~240g/kg in permafrost.②The factors which influence the content of Se were soil,the ecosystem,the direction of slope and the position of slope from high to low.③In the top of soil,the content of Se is more than the bottom of soil and the content of Se reduce little by little.④The order of the content of Se frow high to low is the virgin wetland,the virgin forest and the clear cutting forest.And the influence of the position of slope and the direction of slope on Se content is not notable.更多还原