黄元仿,教授,博士生导师。国际土壤学联合会土壤工程与技术委员会主席,中国土壤学会副理事长,北京土壤学会理事长。主要从事土壤过程定量化、耕地保育、土地整治与生态修复等研究。主持国家自然科学基金、国家重点研发计划等项目课题30余项;在《农业工程学报》、Environmental Science and Technology、Geoderma等期刊发表学术论文200余篇;出版学术专著30余部。
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Soil total nitrogen driving factor analysis and model construction: A case study of the Huangshui River Basin
College of Land Science and Technology/Key Laboratory of Arable Land Conservation in North China of Ministry of Agriculture and Rural Affairs,China Agricultural University,Beijing 100193,China
To better understand the drivers of soil nitrogen, maintain the stability of the ecological system in the Huangshui River Basin, this study based on a set of measured soil Total Nitrogen (TN) data in the Huangshui River Basin, a hybrid model was developed using the random forest, Pearson correlation analysis, and multi-scale geographically weighted regression methods was adopted to analyze the driving factors of soil TN. The results show that: 1) Soil TN exhibited a gradual increase from the southeastern to northwestern regions of the basin. High-value areas were concentrated in the northwestern high-altitude zones, while low-value areas sporadically occurred along the mid-to-lower reaches of the Huangshui River. 2) The primary drivers were the annual mean temperature, pH, and distance to urban areas. There were differences in the magnitude and scale of the impact of various factors on soil TN. Feature importance from highest to lowest is: Annual mean temperature (78.5%)>pH (6.9%)>distance to urban areas (1.4%). Bandwidth from highest to lowest is: Annual mean temperature (278 km)>distance to urban areas (85 km)>pH (48 km). 3) The hybrid model, using only three variables, achieved equivalent adjusted R² (0.41) to the original 19-variable model. It also outperformed the original model in terms of stability index AICc and effective degrees. The soil TN in the Huangshui River Basin displayed a belt-shaped spatial distribution pattern. Annual mean temperature, operating at larger spatial scales, was the dominant natural driver, while human activities exerted minor localized effects near urban areas. The hybrid model effectively reduced overfitting and has good applicability in this basin. This study provides a scientific reference for sustainable agriculture and ecological protection in the Huangshui River Basin.
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黄元仿,教授,博士生导师。国际土壤学联合会土壤工程与技术委员会主席,中国土壤学会副理事长,北京土壤学会理事长。主要从事土壤过程定量化、耕地保育、土地整治与生态修复等研究。主持国家自然科学基金、国家重点研发计划等项目课题30余项;在《农业工程学报》、Environmental Science and Technology、Geoderma等期刊发表学术论文200余篇;出版学术专著30余部。
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黄元仿,教授,博士生导师。国际土壤学联合会土壤工程与技术委员会主席,中国土壤学会副理事长,北京土壤学会理事长。主要从事土壤过程定量化、耕地保育、土地整治与生态修复等研究。主持国家自然科学基金、国家重点研发计划等项目课题30余项;在《农业工程学报》、Environmental Science and Technology、Geoderma等期刊发表学术论文200余篇;出版学术专著30余部。
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经验贝叶斯克里金法(Empirical Bayesian Kriging)是一种空间插值方法,由Krivoruchko[32]于2012年提出。该方法在传统克里金法的基础上,结合了贝叶斯统计的思想,通过多次迭代结果来估计半变异函数,以更好地解释半变异函数参数的不确定性。经验贝叶斯克里金法在ArcGIS Pro 3.0.0的统计向导模块中提供,可自动执行构建克里金模型所需步骤。
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