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采用室内培养试验,研究了不同凋落物和单宁酸对森林土壤硝态氮和铵态氮的影响.结果表明:凋落物和单宁酸加入均降低了土壤硝态氮和铵态氮含量.杉木凋落物使红壤硝态氮和铵态氮含量分别降低6.1%～25.9%和19.7%～68.6%.杉木凋落物中黄红壤无机氮含量的降幅大于毛竹,对铵态氮的影响极显著.与对照相比,单宁酸处理能显著降低黄红壤中铵态氮含量,单宁酸浓度越高,其降幅越大,至高浓度(HG)时,其降幅达31.9%～57.8%.随着培养时间的延长,低浓度单宁酸处理(HL)中硝态氮含量降幅逐渐增大,第84天达到4.5%;在HG处理下,第7～28天的硝态氮含量增加了10.3%～18.5%,而第56和85天分别降低23.9%和42.3%.
Effects of different litter and tannic acid on soil nitrate and ammonium nitrogen in forest soil were studied by laboratory culture experiments.The results showed that both litter and tannin decreased soil nitrate and ammonium nitrogen content. Cunninghamia lanceolata litter reduced the contents of nitrate nitrogen and ammonium nitrogen in red soil by 6.1% -25.9% and 19.7% -68.6%, respectively. The decline of inorganic nitrogen in yellow-red soil of litter decreased more than that of bamboo and had a significant impact on ammonium nitrogen. Compared with the control, the treatment of tannin could significantly reduce the content of ammonium nitrogen in yellow-red soil. The higher the concentration of tannin was, the greater the decrease was, and the decrease was 31.9% -57.8% at the high concentration (HG) When the culture time prolonged, the decrease of nitrate nitrogen content in low concentration tannin acid treatment (HL) gradually increased and reached 4.5% on the 84th day. Under the HG treatment, the nitrate nitrogen content on the 7th to 28th day increased by 10.3% ~ 18.5%, while on the 56th and 85th, it decreased by 23.9% and 42.3% respectively.