naa a22 4500 510737552 CHVBK 20180411083016.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11284-013-1033-1 doi (NATIONALLICENCE)springer-10.1007/s11284-013-1033-1 Responses of soil microbial biomass and enzymatic activities to different forms of organic nitrogen deposition in the subtropical forests in East China [Elektronische Daten] [Yanna Lü, Congyan Wang, Yanyan Jia, Jingjing Du, Xu Ma, Wenwen Wang, Gaozhong Pu, Xingjun Tian] Numerous studies reported that inorganic nitrogen (N) deposition strongly affected forest ecosystems. However, organic N is also an important component of atmospheric N deposition. The influence of organic N deposition on soil microbial biomass and extracellular enzymatic activities (EEA) in subtropical forests remains unclear. Coniferous forest (CF) and 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 for 1year. Soil samples were collected every 2months. Subsequently, soil microbial biomass and EEA were assayed. Results showed that the microbial biomass and EEA of soils fertilized with urea and amino acids increased significantly, whereas those fertilized with nonylamine and mixed N decreased significantly. Urea and amino acid fertilizations had a more positive influence on EEA of BF than on those of CF. Nonylamine fertilization had a more negative influence on EEA of CF than on those of BF. Organic N fertilization shifted soil microbial biomass away from the excretion of N-degrading enzymes and toward the excretion of C-degrading enzymes. These results suggest that organic N type is an important factor that affects soil microbial biomass, EEA, and their relationship. Organic N deposition may seriously affect soil C and N cycling, as well as carbon dioxide releasing from the soils by influencing microbial activities and biomass. This study thereby provides evidence that soil microorganisms have strong feedback to different forms of organic N deposition. The Ecological Society of Japan, 2013 Coniferous forest nationallicence Broad-leaved forest nationallicence Organic nitrogen deposition nationallicence Extracellular enzymatic activities nationallicence Soil microbial biomass nationallicence Lü Yanna School of Life Sciences, Nanjing University, Hankou Road 22, 210093, Nanjing, People's Republic of China aut Wang Congyan School of Environmental Sciences, Jiangsu University, 212013, Zhenjiang, People's Republic of China aut Jia Yanyan School of Life Sciences, Nanjing University, Hankou Road 22, 210093, Nanjing, People's Republic of China aut Du Jingjing School of Life Sciences, Nanjing University, Hankou Road 22, 210093, Nanjing, People's Republic of China aut Ma Xu School of Life Sciences, Nanjing University, Hankou Road 22, 210093, Nanjing, People's Republic of China aut Wang Wenwen School of Life Sciences, Nanjing University, Hankou Road 22, 210093, Nanjing, People's Republic of China aut Pu Gaozhong School of Life Sciences, Nanjing University, Hankou Road 22, 210093, Nanjing, People's Republic of China aut Tian Xingjun School of Life Sciences, Nanjing University, Hankou Road 22, 210093, Nanjing, People's Republic of China aut Ecological Research Springer Japan 28/3(2013-05-01), 447-457 0912-3814 28:3<447 2013 28 11284 https://doi.org/10.1007/s11284-013-1033-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11284-013-1033-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lü Yanna School of Life Sciences, Nanjing University, Hankou Road 22, 210093, Nanjing, People's Republic of China aut NATIONALLICENCE 700 1- Wang Congyan School of Environmental Sciences, Jiangsu University, 212013, Zhenjiang, People's Republic of China aut NATIONALLICENCE 700 1- Jia Yanyan School of Life Sciences, Nanjing University, Hankou Road 22, 210093, Nanjing, People's Republic of China aut NATIONALLICENCE 700 1- Du Jingjing School of Life Sciences, Nanjing University, Hankou Road 22, 210093, Nanjing, People's Republic of China aut NATIONALLICENCE 700 1- Ma Xu School of Life Sciences, Nanjing University, Hankou Road 22, 210093, Nanjing, People's Republic of China aut NATIONALLICENCE 700 1- Wang Wenwen School of Life Sciences, Nanjing University, Hankou Road 22, 210093, Nanjing, People's Republic of China aut NATIONALLICENCE 700 1- Pu Gaozhong School of Life Sciences, Nanjing University, Hankou Road 22, 210093, Nanjing, People's Republic of China aut NATIONALLICENCE 700 1- Tian Xingjun School of Life Sciences, Nanjing University, Hankou Road 22, 210093, Nanjing, People's Republic of China aut NATIONALLICENCE 773 0- Ecological Research Springer Japan 28/3(2013-05-01), 447-457 0912-3814 28:3<447 2013 28 11284 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer