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中文摘要：
通过野外氮沉降模拟试验,研究了氮沉降对亚热带森林（罗浮栲、杉木和浙江桂）土壤速效磷和速效钾的影响,试验处理设置为对照[CK,0 kg/（hm2.a）]、低氮[LN,（30 kg/（hm2.a）]和高氮[HN,100 kg/（hm2.a）]。结果表明,长期氮沉降作用下,罗浮栲和杉木土壤速效磷的含量和速效磷/速效钾值皆随氮沉降水平提高而增加,而浙江桂土壤速效磷和速效磷/速效钾值则随氮沉降水平提高而减小;氮沉降对土壤速效钾有淋失作用（LN〉HN）,但影响不显著,各处理之间的速效钾含量差异小;不同森林土壤之间的速效磷或速效钾含量差异较大;保留凋落物与去除凋落物处理之间的试验结果呈显著正相关性。
英文摘要：
A field-simulated nitrogen deposition experiment was conducted to research the effects of applied nitrogen on available P and available K in three forests（Castanopsis fabri,Cunninghamia lanceolata and Cinnamomum chekiangense） of subtropical zone.Treatments were set as the control [CK,0 kg /（hm 2.a） ],low nitrogen[LN,（30 kg/（hm 2.a） ]and high nitrogen [HN,（100 kg /（hm 2.a） ].The result showed that the content of soil available P and the radio of P/K in Castanopsis fabri and Cunninghamia lanceolata increased subtantially with the rate of applied nitrogen,while a contrary consequence was found in the soil of Cinnamomum chekiangense.Long-term nitrogen deposition resulted in losses of the available K,but no significant effects were found from all treatments.Great different results were found in different forest soils.The effects of between treatment with litter and without litter showed a significant positive correlation.
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Effects of leaf littertannin on soil ammonium and nitrate content in two different forest soils of m
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