摘要
[目的]系统分析坡改梯工程中坡度、植被这两大核心要素的水保效应机理,为多指标机理研究提供可借鉴的具体方法,补充完善水保工程生态效应理论,为生态文明建设实践提供理论指导。[方法]从坡改梯工程两大核心要素(坡度、植被)出发,综合运用多种数学模型对其水保效应机理进行深度剖析。[结果]①基于线性模型,实现全文5个指标总水保效应在同一时空条件下的线性分解,进而依据各组分相对贡献率的精确计算,首次真正从完整理论意义上揭示坡改梯工程水保效应产生的真实根源。②基于多重回归分析,从大量备选模型中筛选最优数学模型,深刻揭示上述各组分水保效应的具体影响因素及其作用机制。③基于结构方程模型(SEM),验证了含物理因子、化学因子两个潜变量在内的具体理论模型作为全文5个指标水保效应本质反映的合理性。通过SEM群组分析,同时拟合了两种坡度条件下的预设模型,清晰直观地展示出各因素间的内在联系,及不同坡度条件下水保效应机理的差异性规律。④基于主成分分析原理,构建包含5个原始变量80.8%信息的综合性因子,将评价指标由五维转变为一维,实现水保效应的整体性综合定量评价。[结论]基于高阶数据分析方法可实现多因素水保效应机理研究结论的深度整合,加深人们对其具体机理的认识,亦可为多指标机理研究提供方法论参考,有助于构建更高预测精度的专业数学模型,提升水土流失治理实践的效率。
[Objective]The soil and water conservation effect mechanism of the two core elements(slope and vegetation)in a slope-to-terrace project were systematically analyzed to provide specific methods for multi-index mechanism research,to supplement and improve the ecological effect theory of water conservation projects,and to provide theoretical guidance for the practice of ecological civilization construction.[Methods]Slope and vegetation factors were comprehensively considered,and a variety of mathematical models were used to deeply analyze their water conservation effect mechanisms.[Results]①Based on a linear model,the linear component decomposition of the total soil and water conservation effect of the five indicators in the full text under the same spatiotemporal conditions was realized.Furthermore,based on the precise calculation of the relative contribution rate of each component,the real source of the soil and water conservation effect of the slope-to-terrace project was revealed for the first time in a theoretical sense.②Based on multiple regression analysis,the optimal mathematical model was selected from a large number of alternative models,and the specific influencing factors and mechanism of the soil and water conservation effect of the above components were profoundly revealed.③Based on structural equation modeling(SEM),the rationality of the specific theoretical model including two latent variables(physical factor and chemical factor)reflecting the soil and water conservation effect of the five indicators in the full text was verified.By SEM group analysis,the preset models under the two slope conditions were fitted at the same time,clearly and intuitively showing the internal relationship between the factors and the differences in the mechanisms of the soil and water conservation effect under different slope conditions.④Based on principle component analysis,a comprehensive factor containing 80.8%of the information of five original variables was constructed,and the evaluation index was changed from five dimensions to one dimension,so as to realize the overall comprehensive quantitative evaluation of soil and water conservation effects.[Conclusion]Based on advanced data analysis methods,deep integration of research conclusions on the mechanism of the multi-factor soil and water conservation effect can be achieved,which deepens people’s understanding of its specific mechanism.It can also provide a methodological reference for the research of multi-index mechanisms,help to build professional mathematical models with higher predictive accuracy,and improve the efficiency of soil and water conservation practice.
作者
贺军
刘卫敏
南宏伟
朱丙轩
储泽毅
He Jun;Liu Weimin;Nan Hongwei;Zhu Bingxuan;Chu Zeyi(Shanxi Water Conservancy Construction Development and Consulting Corporation,Taiyuan,Shanxi 030001,China;College of Forestry,Shanxi Agricultural University,Jinzhong,Shanxi 030801,China)
出处
《水土保持通报》
CSCD
北大核心
2023年第1期32-43,共12页
Bulletin of Soil and Water Conservation
基金
山西省水利科学技术研究与推广项目“水土保持措施体系与河流水环境的响应关系研究:以梯田治理体系为例”(SZ-2020-22)。
关键词
坡改梯
植被
坡度
交互作用
水土保持效应
结构方程模型
线性模型
slope-to-terrace engineering
vegetation
slope
interaction
soil and water conservation effect
structural equation modeling
linear model
