欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
基于第二次全国土壤普查5336个典型土壤剖面数据,分析表土全氮（A层）与环境因素的相关关系,利用多元回归模型和HASM模型结合的方法模拟中国国家尺度上表层土壤全氮的空间分布格局。结果表明：对350个检验点模拟结果的平均绝对误差和平均相对误差为0.67g.kg-1和61.06%,与普通克里格法相比分别降低了0.05g.kg-1和17.53%;对样点分布较少的西北地区的模拟结果也更符合实际情况。多元回归模型和HASM模型结合的方法考虑了环境因素的影响,可作为目前模拟大尺度土壤性质空间分布相对有效的方法。
英文摘要：
Based on 5336 typical soil profiles collected during the second national soil survey period,the correlation between topsoil total nitrogen（A horizon） and 11 environmental factors were analyzed and spatial distribution of topsoil nitrogen（TN） at national scale in China was simulated with the combination of multiple regression model and HASM model.Results indicated that,mean absolute error and mean relative error of the predicted value for 350 validation points were 0.67 g·kg-1 and 61.06%;compared with ordinary kriging method,the two errors were reduced by 0.05 g·kg-1 and 17.53% respectively.Besides,simulation result for northwest China,where the density of sample points was much smaller,was much closer to the actual situation.Thus,a combined method of multiple regression model and HASM model,which took the influence of environmental factors into account,can be used as an effective method for simulating spatial distribution of soil properties at a large scale.
同期刊论文项目
同项目期刊论文
An Adaptive Method of High Accuracy Surface Modeling and Its Application to Simulating Elevation Sur
期刊信息
位置：