title: [Effects of litters and tannin on forest soil inorganic nitrogen].
abstract: A laboratory incubation test was conducted to study the effects of litters and tannin on forest soil nitrate- and ammonium N. The addition of litters and tannic acid made the soil nitrate- and ammonium N decreased. With the addition of fir litter, the nitrate- and ammonium N contents in red soil decreased by 6.1%-25. 9% and 19.7%-68.6%, respectively, and the decrements in yellow-red soil were higher than those with the addition of bamboo litter, being significant for ammonium N. Compared with the control, the addition of tannin decreased the ammonium N content in yellow-red soil significantly, and there was a positive correlation between the concentration of added tannin and the decrement of soil ammonium N content. When the concentration of added tannin was high, the decrement of the ammonium N reached 31.9%-57.8%. With the addition of low concentration tannin, the soil nitrate N content decreased with time, and the decrement on the 84th day reached 4.5%. However, the addition of high concentration tannin increased the soil nitrate N content by 10.3%-18.5% in the first 7-28 days, but decreased it by 23.9% and 42.3% on the 56th and 85th day, respectively.
authors.affiliation: Province-Ministry Co-Constuct Key Laboratory of Humid Subtropical Eco-geographical Process of Ministry of Education/Fujian Province Key Laboratory of Subtropical Resources and Environment, Fuzhou 350007, China. mh1936@163.com
authors.forename: Hong-Liang
authors.initials: HL
authors.lastname: Ma
authors.forename: Wei-Li
authors.initials: WL
authors.lastname: Liu
authors.forename: Ren
authors.initials: R
authors.lastname: Gao
authors.forename: Yu-Sheng
authors.initials: YS
authors.lastname: Yang
authors.forename: Jie
authors.initials: J
authors.lastname: Sun
mesh_terms: D009566:Nitrates / Q000737:chemistry; D009584:Nitrogen / Q000032:analysis*; D018515:Plant Leaves / Q000378:metabolism*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D012987:Soil / Q000737:chemistry*; D013634:Tannins / Q000737:chemistry* / Q000378:metabolism; D014197:Trees / Q000254:growth & development*
chemical_list: D009566:Nitrates; D000644:Quaternary Ammonium Compounds; D012987:Soil; D013634:Tannins; D009584:Nitrogen