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Seasonal Variations and Influencing Factors of Gross Nitrification Rate in Desert Steppe Soil

文献类型： 外文期刊

作者： Qiu, Xiao 1 ; Hou, Jia 1 ; Guo, Na 1 ; Wang, Zhanyi 1 ; Wang, Chengjie 1 ;

作者机构： 1.Inner Mongolia Agr Univ, Coll Grassland Resource & Environm, Hohhot 010011, Peoples R China

2.Minist Educ China, Key Lab Grassland Resources, Hohhot 010011, Peoples R China

3.Inner Mongolia Acad Agr & Anim Husb Sci, Hohhot 010031, Peoples R China

4.Inner Mongolia Agr Univ, Coll Vocat & Technol, Baotou 014109, Peoples R China

关键词： light chestnut soil; barometric process separation; primary nitrification rate; soil moisture; nitrogen cycling

期刊名称：SUSTAINABILITY （ 影响因子：3.889； 五年影响因子：4.089 ）

ISSN：

年卷期： 2022 年 14 卷 8 期

页码：

收录情况： SCI

摘要： Nitrification plays an important role in nitrogen (N) turnover and N cycling. To date, there have been many studies on the net N turnover in grassland. However, few studies have specifically focused on the gross N turnover, which is mainly due to methodological limitations. Here, we set up an enclosed plot in a desert steppe and determined the gross nitrification (GN) rate of the soil by using the barometric process separation method. We found the seasonal dynamics of the GN in the desert steppe soil, such that the GN in the summer (117.65 +/- 24.86 mu g N kg(-1) h(-1)) was significantly greater than in the spring and autumn (65.17 +/- 7.33 mu g N kg(-1) h(-1)), and it peaked in July (213.75 +/- 44.66 mu g N kg(-1) h(-1)). Additionally, the GN was lowest in the spring, with a means of 50.52 +/- 3.95 mu g N kg(-1) h(-1). The seasonal variation in the GN was different than the seasonal variation in the net nitrification rate, and the GN was generally much higher than the net nitrification rate. We further demonstrated that the soil moisture, temperature, bulk density and NH4+-N were the main factors that influenced the seasonal variations in the GN, and that the soil moisture had the greatest impact on the GN among all the factors measured.

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