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通过室内模拟氮沉降试验,研究了氮沉降对温带典型森林土壤有效氮的影响.结果表明:试验期间,与对照相比,经过氮沉降处理的土壤铵态氮、硝态氮和有效氮均呈增长的趋势,增加的程度取决于森林类型、土层、氮处理类型和氮处理的持续时间.氮沉降对不同林型土壤有效氮形态和含量的影响不同,氮沉降对混交林的影响弱于阔叶林,强于针叶人工纯林;土壤A层对氮沉降的敏感程度大于土壤B层;铵态氮形态沉降对土壤铵态氮含量的影响比对土壤硝态氮含量的影响大,而硝态氮形态沉降对土壤硝态氮含量的影响比对土壤铵态氮含量的影响大,混合形态的氮沉降对二者均有促进作用,且增加幅度更高;氮沉降对土壤有效氮的影响存在累加效应.
The effects of nitrogen deposition on soil available N in typical temperate forests were studied by indoor simulated nitrogen deposition test.The results showed that compared with the control, the contents of ammonium nitrogen, nitrate nitrogen and available nitrogen in the soil after nitrogen deposition were The increasing tendency depends on the type of forest, the type of soil layer, the type of nitrogen treatment and the duration of nitrogen treatment.Different from the effect of nitrogen deposition on the available nitrogen form and content in different forest types, the effect of nitrogen deposition on mixed forest is weaker The broadleaf forest was stronger than that of needle-planted artificial forest. The sensitivity of soil layer A to nitrogen deposition was greater than that of soil layer B. The effect of ammonium nitrogen deposition on soil ammonium nitrogen content was greater than that on soil nitrate nitrogen content. However, the effect of nitrate-N deposition on soil nitrate nitrogen content was greater than that on soil ammonium nitrogen content, and the mixed form of nitrogen deposition promoted both, and the increase rate was higher. Nitrogen deposition on soil available nitrogen There is a cumulative effect of the additive effect.