干旱区生态环境知识资源中心(Arid): Mapping of Soil Total Nitrogen Content in the Middle Reaches of the Heihe River Basin in China Using Multi-Source Remote Sensing-Derived Variables

Arid

DOI	10.3390/rs11242934
	Mapping of Soil Total Nitrogen Content in the Middle Reaches of the Heihe River Basin in China Using Multi-Source Remote Sensing-Derived Variables
	Zhou, Tao 1,2; Geng, Yajun 3; Chen, Jie 3; Sun, Chuanliang 3,4; Haase, Dagmar 1,2; Lausch, Angela 1,2
通讯作者	Zhou, Tao
来源期刊	REMOTE SENSING
EISSN	2072-4292
出版年	2019
卷号	11 期号:24
英文摘要	Soil total nitrogen (STN) is an important indicator of soil quality and plays a key role in global nitrogen cycling. Accurate prediction of STN content is essential for the sustainable use of soil resources. Synthetic aperture radar (SAR) provides a promising source of data for soil monitoring because of its all-weather, all-day monitoring, but it has rarely been used for STN mapping. In this study, we explored the potential of multi-temporal Sentinel-1 data to predict STN by evaluating and comparing the performance of boosted regression trees (BRTs), random forest (RF), and support vector machine (SVM) models in STN mapping in the middle reaches of the Heihe River Basin in northwestern China. Fifteen predictor variables were used to construct models, including land use/land cover, multi-source remote sensing-derived variables, and topographic and climatic variables. We evaluated the prediction accuracy of the models based on a cross-validation procedure. Results showed that tree-based models (RF and BRT) outperformed SVM. Compared to the model that only used optical data, the addition of multi-temporal Sentinel-1A data using the BRT method improved the root mean square error (RMSE) and the mean absolute error (MAE) by 17.2% and 17.4%, respectively. Furthermore, the combination of all predictor variables using the BRT model had the best predictive performance, explaining 57% of the variation in STN, with the highest R-2 (0.57) value and the lowest RMSE (0.24) and MAE (0.18) values. Remote sensing variables were the most important environmental variables for STN mapping, with 59% and 50% relative importance in the RF and BRT models, respectively. Our results show the potential of using multi-temporal Sentinel-1 data to predict STN, broadening the data source for future digital soil mapping. In addition, we propose that the SVM, RF, and BRT models should be calibrated and evaluated to obtain the best results for STN content mapping in similar landscapes.
英文关键词	remote sensing random forest digital soil mapping support vector machine boosted regression trees soil total nitrogen
类型	Article
语种	英语
国家	Germany ; Peoples R China
开放获取类型	gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000507333400050
WOS关键词	ORGANIC-CARBON STOCKS ; GEOGRAPHICALLY WEIGHTED REGRESSION ; RANDOM FOREST MODELS ; LAND-USE ; SPATIAL-DISTRIBUTION ; DESERT-OASIS ; ARID REGION ; PREDICTION ; STORAGE ; FRAGMENTATION
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology
EI主题词	2019-12-02
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311495
作者单位	1.Humboldt Univ, Dept Geog, Unter Linden 6, D-10099 Berlin, Germany; 2.UFZ Helmholtz Ctr Environm Res, Dept Computat Landscape Ecol, Permoserstr 15, D-04318 Leipzig, Germany; 3.Nanjing Agr Univ, Coll Resources & Environm Sci, Weigang 1, Nanjing 210095, Peoples R China; 4.Jiangsu Acad Agr Sci, Zhongling St 50, Nanjing 210014, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Tao,Geng, Yajun,Chen, Jie,et al. Mapping of Soil Total Nitrogen Content in the Middle Reaches of the Heihe River Basin in China Using Multi-Source Remote Sensing-Derived Variables[J],2019,11(24).
APA	Zhou, Tao,Geng, Yajun,Chen, Jie,Sun, Chuanliang,Haase, Dagmar,&Lausch, Angela.(2019).Mapping of Soil Total Nitrogen Content in the Middle Reaches of the Heihe River Basin in China Using Multi-Source Remote Sensing-Derived Variables.REMOTE SENSING,11(24).
MLA	Zhou, Tao,et al."Mapping of Soil Total Nitrogen Content in the Middle Reaches of the Heihe River Basin in China Using Multi-Source Remote Sensing-Derived Variables".REMOTE SENSING 11.24(2019).