Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 1998, Vol. 9 ›› Issue (3): 166

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The mineralization and transformation of both added organic nitrogen and native soil N in red soils from four different ecological conditions

Ye Qing-Fu1, Zhang Qin-Zheng1, He Zhen-Li2, Xi Hai-Fu1, Wu Gang1, Wilson M J3   

  1. 1 Institute of Nuclear-Agricultural Sciences;
    2 Department of Soil Science and Agricultural Chemistry, Zhejiang Agricultural University, Hangzhou 310029;
    3 Macaulay Land Use Research Institute, Aberdeen, UK
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Ye Qing-Fu, Zhang Qin-Zheng, He Zhen-Li, Xi Hai-Fu, Wu Gang, Wilson M J. The mineralization and transformation of both added organic nitrogen and native soil N in red soils from four different ecological conditions.Nuclear Science and Techniques, 1998, 9(3): 166

Abstract: The NH4+-N microbial biomass-N, humus-N, and extractable organic N derived from the added 15N-labelled ryegrass and soil indigenous pool were measured separately with 15N tracing techniques. Based on the recovery of NH4+-15N and lost-15N (mainly as NH), more than 30% of the added ryegrass 13N was mineralized in 15d. The amount of mineralized N increased with time up to 90d for all soils except for the upland soil in which it decreased slightly. The mineralization of ryegrass N and incorporation of ryegrass-13N into microbial biomass was greatest in upland soil. The transformation of ryegrass 15N into humus 15N occurred rapidly in 15d, with higher humus 15N occurring in the upland or tea-garden soil than the paddy and unarable soil. The addition of ryegrass caused additional mineralization of soil indigenous organic N and enhanced the turnover of both microbial biomass N and stable wewanic Wha eel

Key words: Agro-ecosystems, Microbial biomass, Ryegrass, Nitrogen transformations