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Spatial and temporal trends of soil total nitrogen and C/N ratio for croplands of East China

文献类型： 外文期刊

作者： Deng, Xunfei 1 ; Ma, Wanzhu 1 ; Ren, Zhouqiao 1 ; Zhang, Minghua 3 ; Grieneisen, Michael L. 3 ; Chen, Xiaojia 1 ; Fei, 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Digital Agr, Hangzhou 310021, Zhejiang, Peoples R China

2.Minist Agr & Rural Affairs, Key Lab Informat Traceabil Agr Prod, Hangzhou 310021, Zhejiang, Peoples R China

3.Univ Calif Davis, Dept Land Air & Water Resources, Davis, CA 95616 USA

4.Stn Planting Ind Management Ningbo City, Ningbo 315012, Zhejiang, Peoples R China

5.Sichuan Univ, Dept Environm Sci & Engn, Chengdu 610065, Sichuan, Peoples R China

关键词： Soil nitrogen content; Spatial mapping; Random forest; Nitrogen fertilization; Soil C/N ratio

期刊名称：GEODERMA （ 影响因子：6.114； 五年影响因子：6.183 ）

ISSN： 0016-7061

年卷期： 2020 年 361 卷

页码：

收录情况： SCI

摘要： Adequate soil total nitrogen (TN) is critical to crop productivity, and soil carbon-to-nitrogen ratio (C/N) is an important indicator of soil fertility. Accurate knowledge of soil TN content and C/N ratio is essential for precision agriculture and soil biogeochemical modeling. This study aims to characterize the spatial and temporal trends of soil TN level and C/N ratio for cropland soil across Zhejiang province of East China. A total of 29,927 topsoil (0-20 cm) samples were collected during 2007-2008 for analyzing soil properties, on the basis of which we mapped the soil TN content at a 250 m resolution using a random forest model (RF). With 22 predictors covering soil properties, fertilization, meteorology, locations, and population density, the RF model showed good predictive performance with cross-validation R-2 = 0.65 and RMSE = 0.43 g kg(-1). The soil pH, cation exchange capacity (CEC), and fertilization played important roles in determining the spatial variations of soil TN and C/N ratio. The overall level of cropland soil TN within the study area was estimated to be 1.75 +/- 0.43 g kg(-1) (mu +/- sigma), varying from 0.25 to 3.64 g kg(-1). By comparing our estimates with the previous extensive survey for 1979-1985, we found that the soil TN has slightly increase trend and the soil C/N ratio slightly decreased, which was attributed to intensified N fertilization in the last decade. This work provides up-to-date knowledge of soil TN content and soil C/N ratio in Zhejiang province of East China, indicating the importance of updating soil property databases for better regional cropland management.

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