You Position: Home > Paper
Effect of Seasonal Snow Cover on Soil Nitrogen Mineralization in an Alpine Meadow on the Eastern Tibetan Plateau
( views:44, downloads:0 )
- Author:
- No author available
- Journal Title:
- Chinese Journal of Applied & Environmental Biology
- Issue:
- 4
- DOI:
- No doi available
- Key Word:
- 季节性雪被;土壤氮;氨化作用;硝化作用;矿化作用;高寒草甸;青藏高原
Abstract： 依据自然雪被分布的差异,在青藏高原东缘高寒草甸中设置3条样带(即深雪、中等厚度雪被和浅雪),于2008年的秋冬过渡期,连续监测各样带中的雪被厚度和土壤温度,并采用原位培养法测定每月的土壤氮素氨化、硝化和矿化速率,以研究不同厚度雪被对高寒草甸土壤氮矿化的影响.结果表明,月均土温、每月日最高土温均值分别与雪被厚度极显著相关,二次函数关系拟合较好( R2= 0.576,0.685),且根据每月日最高土温均值与雪被厚度的二次函数关系方程可知,25 cm厚的雪被可以起到较好的隔绝效果；土壤含水量受雪被厚度和土壤温差两个因素的显著影响.在秋冬过渡期末,浅雪梯度下土壤硝态氮含量显著降低,且雪被下的净氮矿化速率与月均土温、每月日最高土温均值、每月日最低土温均值都分别呈极显著相关,二次函数关系拟合较好(R2= 0.589,0.541,0.601).研究表明,不同厚度的雪被对土壤温度和含水量影响显著,从而显著地影响着土壤氮的矿化,深雪更有利于氨化、硝化和氮矿化.
- [1]王光军,田大伦,朱凡,等.湖南省4种森林群落土壤氮的矿化作用[J].2009,(3).
- [2]王洋,刘景双,王国平,等.冻融作用与土壤理化效应的关系研究[J].2007,(2).
- [3]张笑千,陈卓,常鹏,等.土壤氮素矿化研究进展[J].2010,(15).
- [4]李贵才,韩兴国,黄建辉,等.森林生态系统土壤氮矿化影响因素研究进展[J].2001,(7).
- [5]王常慧,邢雪荣,韩兴国.草地生态系统中土壤氮素矿化影响因素的研究进展[J].2004,(11).
- [6]Walker, D.A.,Halfpenny, James C..Long-term studies of snow-vegetation interactions.[J].1993,43(5).
- [7]Lipson DA,Schmidt SK,Schadt CW.Changes in soil microbial community structure and function in an alpine dry meadow following spring snow melt[J].2002,43(3).
- [8]Paul D. Brooks,Mark W. WilliamsSteven K. Schmidt.Inorganic nitrogen and microbial biomass dynamics before and during spring snowmelt[J].1998,43(1).
- [9]K. J. Nadelhoffer,A. E. Giblin,G. R. Shaver,etc.Effects of Temperature and Substrate Quality on Element Mineralization in Six Arctic Soils[J].1991,72(1).
- [10]Barry R. Taylor,H. Gerald Jones.Litter decomposition under snow cover in a balsam fir forest[J].1990,68(1).
- [11]Kerstin Hentschel,Egbert Matzner,Werner Borken.Repeated freeze-thaw events affect leaching losses of nitrogen and dissolved organic matter in a forest soil[J].2008,171(5).
- [12]P. A. Cawse.The determination of nitrate in soil solutions by ultraviolet spectrophotometry[J].1967,92(1094).
- [13]L. E. Goodrich.The influence of snow cover on the ground thermal regime[J].1982,19(4).
- [14]A. AMOROSO,F. DOMINE,G. ESPOSITO.Microorganisms in Dry Polar Snow Are Involved in the Exchanges of Reactive Nitrogen Species with the Atmosphere[J].2010,44(2).
- [15]Driscoll CT,Tierney,Hardy JP,etc.Effects of mild winter freezing on soil nitrogen and carbon dynamics in anorthern hardwood forest[J].2001,56(2).
- [16]Schmidt SK,Costello EK,Nemergut DR,etc.Biogeochemical consequences of rapid microbial turnover and seasonal succession in soil[J].2007,88(6).
- [17]Schilling R,Schloter M,Szele Z,etc.Influence of freeze-thaw stress on the structure and function of microbial communities and denitrifying populations in soil[J].2006,72(3).
- [18]Liu, L,Wu, Y,Wu, N,etc.Effects of Freezing and Freeze-Thaw Cycles on Soil Microbial Biomass and Nutrient Dynamics under Different Snow Gradients in an Alpine Meadow (Tibetan Plateau)[J].2010,58(4).
- [19]Driscoll, Charles T.,Fahey, Timothy J.,Fashu-Kanu, Samuel,etc.Snow depth, soil freezing and nitrogen cycling in a northern hardwood forest landscape[J].2011,102(1).