祁连山青海云杉林土壤氮的含量特征
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林业公益性行业科研专项(201204101-4)和国家自然科学基金重大研究计划项目(91025022)资助


Characteristics of Nitrogen Contents of Picea crassifolia Forest in Qilian Mountains
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    摘要:

    通过野外取样和实验室分析,研究了祁连山东、西段青海云杉林土壤全氮和有效氮(铵态氮和硝态氮)含量的特征。结果表明:①祁连山东、西段土壤全氮、铵态氮和硝态氮含量变化范围分别为1.78 ~ 7.89 g/kg和1.50 ~ 4.39 g/kg,6.33 ~ 24.96 mg/kg和0.37 ~ 23.60 mg/kg,5.23 ~ 20.74 mg/kg和0.20 ~ 10.19 mg/kg,各氮素形态含量均是祁连山东段大于祁连山西段;在祁连山青海云杉林中土壤铵态氮为土壤有效氮的主要存在形式,其所占比例在祁连山东、西段分别为70.58%和87.58%。②在祁连山东、西段0 ~ 10、10 ~ 20、20 ~ 40 cm土层中,土壤全氮和铵态氮含量均随土层深度的增加呈减小趋势;不同土层土壤全氮平均含量均是祁连山东段显著高于祁连山西段(P<0.05);祁连山东、西段土壤铵态氮含量在0 ~ 10 cm和10 ~ 20 cm土层中差异均不显著(P>0.05),仅在20 ~ 40 cm土层中差异显著(P<0.05);硝态氮含量在祁连山东段随土层的加深并没有明显的变化规律,在西段随土层深度的增加呈减小趋势,东、西段土壤硝态氮含量在0 ~ 10 cm土层差异不显著(P>0.05),在10 ~ 20 cm和20 ~ 40 cm差异显著(P<0.05)。③祁连山东、西段土壤全氮、铵态氮和硝态氮含量在不同土层深度的变异系数均没有明显的变化规律,除土壤硝态氮在祁连山西段不同土层深度的变异为强变异性外,土壤全氮、铵态氮和硝态氮含量在祁连山东、西段不同土层深度的变异均为中等变异。④祁连山东、西段土壤全氮和铵态氮含量之间均呈显著相关性,但全氮和硝态氮含量及铵态氮和硝态氮含量之间均无显著相关性。

    Abstract:

    In the light of field sampling and laboratory analysis, soil total nitrogen and available nitrogen (NH4+-N and NO3–-N) contents of Picea crassifolia forest in the eastern and western regions of the Qilian Mountains were discussed and compared. The results showed that: (1) Soil total nitrogen, NH4+-N and NO3–-N variation range respectively were 1.78 - 7.89 g/kg and 1.50 - 4.39?g/kg, 6.33 - 24.96 mg/kg and 0.37 - 23.60 mg/kg, 5.23 - 20.74 mg/kg and 0.20 - 10.19 mg/kg in the eastern and western regions, the contents of each nitrogen forms in the eastern region were higher than in the western, soil NH4+-N was major forms of soil available nitrogen of Picea crassifolia forest, the proportion respectively were 70.58% and 87.58% in the eastern and western regions, respectively; (2) At 0 - 10 cm, 10 - 20 cm and 20 - 40 cm soil layers of Picea crassifolia forest, soil total nitrogen and available nitrogen contents decreased with the increase of soil depth in both regions. In different soil layer, soil total nitrogen average content in the eastern region were significantly higher than that in the western region(P < 0.05), and soil NH4+-N content at 0 - 10 cm and 10 - 20 cm soil layers were not significantly different (P > 0.05) but significantly differed at 20 - 40 cm (P < 0.05) in both regions. NO3–-N content changed irregularly with soil depth in the eastern region but decreased gradually in the western region, NO3–-N content at 0 - 10 cm showed no significant difference (P > 0.05) but significant difference at 0 - 10 cm and 10 - 20 cm (P < 0.05) in both regions. (3) The variation coefficients of soil total nitrogen, NH4+-N and NO3–-N contents in different soil depths changed irregularly in both regions. Except the variation coefficients of soil NO3–-N in different soil depths of the western region was strong variation, the variation coefficients of soil total nitrogen, NH4+-N and NO3–-N were medium variations in both regions. (4) Soil total nitrogen was significantly correlated with NH4+-N content, but no significant correlation between total nitrogen, NH4+-N and NO3–-N.

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张学龙,赵维俊,车宗玺.祁连山青海云杉林土壤氮的含量特征[J].土壤,2013,45(4):616-622. ZHANG Xue-long, ZHAO Wei-jun, CHE Zong-xi. Characteristics of Nitrogen Contents of Picea crassifolia Forest in Qilian Mountains[J]. Soils,2013,45(4):616-622

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  • 在线发布日期: 2013-09-11
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