文献类型： 外文期刊

第一作者： Li, YZ

作者： Li, YZ;Herbert, SJ

作者机构：

期刊名称：COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS （ 影响因子：1.327； 五年影响因子：1.315 ）

ISSN： 0010-3624

年卷期： 2004 年 35 卷 3-4 期

页码：

收录情况： SCI

摘要： The seasonal dynamics of gross nitrogen, (N) mineralization, nitrification, and mineral nitrogen consumption rates were studied with the N-15 pool dilute technique in burned and unburned Leymus chinensis (Trin.) Tzvel. (Chinese Wildryegrass) grasslands. Gross N mineralization is the gross rate of the process of the conversion of organic N to the NH4+ form during decomposition before N immobilization by microbes. Similarly, gross nitrification is the gross rate of the conversion of NH4+ and organic N to NO3- before N immobilization by microbes, and consumption is sum of mineral N losses by biological or nonbiological processes. Results indicated that gross mineralization and nitrification rates, NH4+ and NO3- consumption rates, and soil concentrations of NH4+ were higher in burned grassland areas than in unburned areas in April and May and that all were lower or similar compared to unburned areas in September. The soil concentrations of NO3- indicated no difference between burned and unburned areas in April and May, but burned areas had higher NO3 in July and September. Results indicate that prescribed burning in spring could benefit the renewal of grasslands of northeast China through mobilization of soil N pools.

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