不同有机氮沉降对植物土壤微生物量和土壤酶活性的影响.pdfVIP

Ecol Res (2013) 28: 447–457 DOI 10.1007/s11284-013-1033-1 ORIGINAL ARTICLE • • Yanna Lu¨ Congyan Wang Yanyan Jia Jingjing Du • Xu Ma • Wenwen Wang Gaozhong Pu • Xingjun Tian Responses of soil microbial biomass and enzymatic activities to different forms of organic nitrogen deposition in the subtropical forests in East China Received: 1 August 2012 / Accepted: 27 January 2013 / Published online: 1 March 2013 The Ecological Society of Japan 2013 Abstract Numerous studies reported that inorganic thereby provides evidence that soil microorganisms have nitrogen (N) deposition strongly affected forest ecosys- strong feedback to different forms of organic N depo- tems. However, organic N is also an important com- sition. ponent of atmospheric N deposition. The influence of organic N deposition on soil microbial biomass and Keywords Coniferous forest Æ Broad-leaved forest Æ extracellular enzymatic activities (EEA) in subtropical Organic nitrogen deposition Æ Extracellular enzymatic forests remains unclear. Coniferous forest (CF) and activities Æ Soil microbial biomass broad-leaved forest (BF) were chosen from the Zijin Mountain in China. Five forms of organic N (urea, glycine, serine, nonylamine, and a mixture of all four) were used to fertilize the soils in CF and BF every month Introduction for 1 year. Soil samples were collected every 2 months. Subsequently, soil microbial biomass and EEA were Nitrogen (N) inputs from anthropogenic sources are assayed. Results showed that the microbial biomass and currently estimated to be 30–50 % greater than those EEA of soils fertilized with urea and amino acids in- from natural terrestrial sources and tenfold gr