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    毛宏蕊, 金光泽. 氮添加对典型阔叶红松林净初级生产力的影响[J]. 北京林业大学学报, 2017, 39(8): 42-49. DOI: 10.13332/j.1000-1522.20160193
    引用本文: 毛宏蕊, 金光泽. 氮添加对典型阔叶红松林净初级生产力的影响[J]. 北京林业大学学报, 2017, 39(8): 42-49. DOI: 10.13332/j.1000-1522.20160193
    MAO Hong-rui, JIN Guang-ze. Impacts of nitrogen addition on net primary productivity in the typical mixed broadleaved-Korean pine forest[J]. Journal of Beijing Forestry University, 2017, 39(8): 42-49. DOI: 10.13332/j.1000-1522.20160193
    Citation: MAO Hong-rui, JIN Guang-ze. Impacts of nitrogen addition on net primary productivity in the typical mixed broadleaved-Korean pine forest[J]. Journal of Beijing Forestry University, 2017, 39(8): 42-49. DOI: 10.13332/j.1000-1522.20160193

    氮添加对典型阔叶红松林净初级生产力的影响

    Impacts of nitrogen addition on net primary productivity in the typical mixed broadleaved-Korean pine forest

    • 摘要: 大气氮(N)浓度日益升高,N沉降对森林生态系统生产力的影响成为当前研究的热点。本研究在典型阔叶红松林内,使用尿素(CO(NH2)2)作为N源,通过向森林地表施N肥的方式对森林生态系统进行为期6年的N添加试验,探究N对森林生态系统各组分碳(C)密度及净初级生产力(NPP)的影响。施N水平分别为N0(0kg/(hm2·a))、N1(30kg/(hm2·a))、N2(60kg/(hm2·a))和N3(120kg/(hm2·a))。结果表明:N添加对森林生态系统植被C库、碎屑C库及土壤C库C密度均无显著影响(P>0.05);对整个森林生态系统的NPP无显著影响,然而对针叶NPP表现出显著抑制作用(P < 0.05),对阔叶NPP表现出显著促进作用。土壤全N含量不受施N影响,但与土壤有机C浓度呈现极显著(P < 0.01)的正相关关系,表明土壤全N含量是土壤有机C的重要影响因素。

       

      Abstract: The impact of nitrogen (N) on net primary productivity (NPP) of forest ecosystem has become focus of the researchers since N deposition is increasingly serious. A six-year field experiment was conducted in the typical mixed broadleaf-Korean pine forest in Xiaoxing'an Mountains, northeastern China, to explore the effects of N addition on carbon (C) density and NPP of forest ecosystem and its components. Urea was selected as N source and four levels of N addition were control (N0, 0kg/(ha·a), low N (N1, 30kg/(ha·a), medium N (N2, 60kg/(ha·a) and high N (N3, 120kg/(ha·a). Results showed that N addition had no significant effects on C density of vegetation C pool, detritus C pool and soil organic C pool (P>0.05). N addition had no significant effects on the NPP of whole forest ecosystem, however, it inhibited NPP of coniferous tree leaf but promoted that of broadleaved trees (P < 0.05). Soil total N concentration had no significant difference among different N addition treatments, but it had a highly significantly positive correlation with soil organic C concentration (P < 0.01). We suggest that soil total N concentration has a significant influence on soil organic C in forest ecosystem, rather than N addition amount.

       

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