Correlation Between CO_2 Efflux and Net Nitrogen Mineralization and Its Response to External C or N Supply in an Alpine Meadow Soil

作     者：SONG Ming-Hua JIANG Jing XU Xing-Liang SHI Pei-Li 

作者机构：Key Laboratory of Ecosystem Network Observation and Modelling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 (China) State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 (China) Graduate University of Chinese Academy of Sciences Beijing 100049 (China) 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2011年第21卷第5期

页      面：666-675页

核心收录：

学科分类：081702[工学-化学工艺] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0713[理学-生态学] 

基　　金：Supported by the National Basic Research Program (973 Program) of China (Nos.2010CB951704 and 2010CB833502) the National Natural Science Foundation for Young Scientists of China (No.30600070) the West Light Joint Scholarship of the Chinese Academy of Sciences 

主　　题：C:N ratio inorganic N labile C organic matter temperature 

摘      要：In nutrient-limited alpine meadows,nitrogen(N) mineralization is prior to soil microbial immobilization;therefore,increased mineral N supply would be most likely immobilized by soil microbes due to nutrient shortage in alpine *** addition,low temperature in alpine meadows might be one of the primary factors limiting soil organic matter decomposition and thus N mineralization.A laboratory incubation experiment was performed using an alpine meadow soil from the Tibetan *** levels of NH4NO3(N) or glucose(C) were added,with a blank without addition of C or N as the control,before incubation at 5,15,or 25 ℃ for 28 ***2 efflux was measured during the 28-d incubation,and the mineral N was measured at the beginning and end of the incubation,in order to test two hypotheses:1) net N mineralization is negatively correlated with CO2 efflux for the control and 2) the external labile N or C supply will shift the negative correlation to *** results showed a negative correlation between CO2 efflux and net N immobilization in the *** inorganic N supply did not change the negative *** external labile C supply shifted the linear correlation from negative to positive under the low C addition ***,under the high C level,no correlation was *** suggested that the correlation of CO2 efflux to net N mineralization strongly depend on soil labile C and C:N ratio regardless of *** research should focus on the effects of the types and the amount of litter components on interactions of C and N during soil organic matter decomposition.