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基于样地调查和室内分析,比较研究了长白山地区典型的8种森林类型土壤有机碳和全氮的质量分数、碳氮比、碳密度和氮密度的分布特征。结果表明,8种林型土壤有机碳和全氮的质量分数变化范围分别是36.99~70.33、3.14~6.04 g·kg-1,有机碳、全氮质量分数最大的林型均是阔叶混交天然林。红松天然林土壤C/N值最大为15.56,其它C/N值变化范围为10.55~12.19。在土壤垂直剖面上,随着土层深度的增加,土壤的有机碳、全氮质量分数随之递减,土壤密度随之递增。8种林型土壤碳密度是杨树天然林最大,为22.13 kg·m-2,氮密度是落叶松人工林最大,为1.97 kg·m-2;针阔混交人工林的碳密度和氮密度均为最小,分别是12.37、1.11 kg·m-2。
Based on the plots and indoor analyzes, the distribution characteristics of soil organic carbon and total nitrogen, carbon and nitrogen ratio, carbon density and nitrogen density of eight typical forest types in Changbai Mountain were comparatively studied. The results showed that the range of soil organic carbon and total nitrogen in the eight forest types was 36.99-70.33 and 3.14-6.04 g · kg-1, respectively, and the species with the highest organic carbon and total nitrogen were broad- forest. The soil C / N value of natural Korean pine plantation was 15.56, while the other C / N values ranged from 10.55 to 12.19. In the vertical section of soil, with the increase of soil depth, the soil organic carbon and total nitrogen decreased with the increase of soil density. The carbon density of 8 kinds of forest soil is the largest natural forest of poplar, 22.13 kg · m-2, the density of nitrogen is 1.97 kg · m-2 in Larix gmelini plantation, the carbon density and nitrogen density Are the smallest, respectively 12.37,1.11 kg · m-2.