1.毕业论文汇总.docVIP

本科毕业论文 上央格气林场落叶松天然林土壤养分分析 学 院：生态环境学院 专 业：资源环境与城乡规划管理 学 号：110413093 姓 名：段文靖 指导教师：张成福 职 称：教授 论文提交日期：二О一五年六月 摘 要 本文以大兴安岭上央格气林场落叶松（Larix gmelinii）天然林土壤为研究对象，对土壤中的各种养分含量进行分析，研究上央格气林场的土壤肥力状况。结果表明：（1）上央格气林场落叶松天然林土壤养分含量为全磷17.06g/kg, 速效磷9.90mg/kg，全钾13.80g/kg，速效钾173.83mg/kg，全氮1.43g/kg，碱解氮29.16mg/kg，土壤有机质60.60g/kg各土壤成分含量随土壤深度的变化趋势并不完全相同（）与《土壤养分等级标准表》对比，全钾、全磷、速效钾、全氮和有机质处于极高的水平，速效磷处于比较低的水平，碱解氮处于极低的水平（）落叶松林中的碱解氮、速效磷、全磷、有机质、全氮含量均低于白桦林和白桦落叶松混交林。 Soil nutrient status of Larix gmelinii in Shangyanggeqi area Based on the greater hinggan mountains in Shangyanggeqi area larch (Larix gmilinii) natural forest soil as the main research object, analyzes all kinds of nutrient content in the soil, research on Shangyanggeqi area condition of forest soil fertility. The results show that （1）The Shangyanggeqi area larch forest on soil nutrient content is 17.06 mg/kg, total phosphorus organic p 9.90 mg/kg, 13.80 g/kg, total potassium rapidly-available potassium 173.83 mg/kg, total nitrogen, 1.43 g/kg, 29.16 mg/kg, alkali solution nitrogen of soil organic matter 60.60 g/kg. The change trend of each component content soil with soil depth is not the same. （2）Compared with Soil Nutrient Standard Forest in China, total potassium and total phosphorus, available potassium, total nitrogen and organic matter are at high levels, available phosphorus is at relatively low level, alkali-solvable nitrogen is at very low levels.（3） Larch forest in the alkali solution nitrogen, available phosphorus, total phosphorus, organic matter, total nitrogen content were lower than birches and birch larch mixed forest. Key words: Shangyanggeqi area Forest soil Larix gmelinii Soil nutrients 目 录 1引言 1 1.1研究目的及意义 1 1.2 国内外研究现状 1 1.3森林演替对土壤的影响 2 1.4土壤有机质的生态作用 3 1.5全氮、碱解氮的生态作用 3 1.6全磷、速效磷的生态作用 4 1.7全钾、速效钾的生态作用 5 2 研究内容与方法 5 2.1研究区自然概况 5 2.2野外采样 6 2.3土样测定方法 7 2.3.1全氮的测定 7 2.3.2碱解氮的测定 7 2.3.3速效磷的测定 8 2.3.4速效钾的测定 9 2.3.5全磷、全钾的测定 9 2.3.6有机质的测定 10 3 结果与分析 11 3.1结果 11 3.1.1结果数据