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Determining the hot spots and hot moments of soil N2O emissions and mineral N leaching in a mixed landscape under subtropical monsoon climatic conditions

文献类型： 外文期刊

作者： Zhou, Zhiwen 1 ; Liao, Kaihua 2 ; Zhu, Qing 2 ; Lai, Xiaoming 2 ; Yang, Juan 1 ; Huang, Jiacong 2 ;

作者机构： 1.Shanghai Acad Agr Sci, Inst Agr Sci & Technol Informat, Shanghai 201403, Peoples R China

2.Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Watershed Geog Sci, Nanjing 210008, Peoples R China

3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

4.Shanghai Engn Res Ctr Informat Technol Agr, Shanghai 201403, Peoples R China

5.Huaiyin Normal Univ, Jiangsu Collaborat Innovat Ctr Reg Modern Agr & E, Huaian 223001, Peoples R China

关键词： DayCent model; Hot spots and hot moments; Land use; Soil N losses; Taihu Lake Basin

期刊名称：GEODERMA （ 影响因子：7.422； 五年影响因子：7.444 ）

ISSN： 0016-7061

年卷期： 2022 年 420 卷

页码：

收录情况： SCI

摘要： Identification of hot spots and hot moments (HSHMs) in regard to soil nitrogen (N) losses has received public attention. Soil nitrous oxide (N2O) emissions and mineral N leaching under varied annual precipitation were simulated with the DayCent model in a mixed landscape (tea garden, bamboo forest and coniferous and broadleaved mixed forests). Their HSHMs were further quantified using the 3rd quartile value of all data as the baseline. Results showed that the hot moments of soil N2O emissions were the dry year, summer, and months with high air temperature (July to September) and months after fertilization (April or May) at inter-annual, seasonal and monthly time scales, respectively. The hot moments of mineral N leaching at these time scales were the normal year or the wet year, spring or rainy seasons after drought, and rainy months after fertilization or drought, respectively. The main factors controlling the formation of hot moments on N losses were temperature, precipitation and fertilization. In addition, the hot spots of N2O emissions and mineral N leaching in the mixed landscape were both distributed in the tea garden (TG). When the entire study area was assumed to be under the same land-use type (i.e., TG), the hot spots of these two kinds of N losses were mainly distributed in the areas with rock fragment content < 0.16 cm3 cm-3, field capacity > 0.24 cm3 cm-3, bulk density > 1.29 g cm-3, soil carbon (C)/N ratio < 13.26, and slope < 12 degrees. These results indicated that fertilizer management, climate factors, soil properties and topography need to be comprehensively considered to alleviate the formation of HSHMs of N losses in mixed landscape mountainous areas.

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