华北落叶松和云杉幼苗生长对氮素浓度响应的差异

Differences in Response of Larix Principis-rupprechtii and Picea Seedlings to Nitrogen Concentration

为了全面掌握华北落叶松和云杉的生长对策差异,为混交林的经营管理提供理论依据。通过人工控制条件下的幼苗栽培试验,研究不同氮素浓度处理下2个树种的苗期生长表现,分析它们的高生长、地径生长、总生物量、生物量分配的不同变化。研究结果表明:华北落叶松和云杉苗期生长对氮素浓度变化都有显著差异,2个树种的响应趋势基本相似,对于氮素的利用也存在显著差异;华北落叶松苗期生长指标高于云杉,尤其以苗高和单株生物量更显著。因此,华北落叶松比云杉对微环境条件的异质性更敏感,在利用林地环境资源支撑其苗期生长的过程中更具有显著优势。

In order to master the difference in growth strategy of Larix principis-rupprechtii and Picea,and provide the theory basis for mixed forests management,with seedlings cultivation experiment under manual control conditions,this paper studied the growth performance in the seedling stage of 2 species under different nitrogen concentrations,and analyzed the differences of height growth,basal diameter growth,tatal biomass and biomass allocation.The results showed that: the growth in seedling stage of 2 species with variation of nitrogen concentrations had significant differences,the response tendency were similar,and the nitrogen utilization also had significant differences;the growth index in seedling stage of Larix principis-rupprechtii were higher than that of Picea,especially the height of seedling and single biomass.Therefore,Larix principi-rupprechtii was more sensitive to microenvironment heterogeneity and had distinct advantages in the growth of seedling stage supported by utilizing land environment resources than Picea.