摘要
为了使我国水蚀区土壤可蚀性指数回归方程的应用更为方便,设计制作了土壤指数诺模图。先分析了土壤指数诺模图制作的数理基础,再通过对比土壤指数诺模图和K因子诺模图的制作技术特点,分析了"序解轴转换法"绘制土壤指数诺模图的技术创新之处;然后对土壤指数诺模图的绘制过程和查用步骤进行了说明,最后对土壤指数诺模图在制作和查用中尚存在的问题作了初步探讨。
The regressive equation between the soil erodibility index S suitable for Chinese water-erosion region and some indictors of the soil physical and chemical characters set up by prophase research is S=661-3 2X^21+0 4X2-1 1X3-2 8X4-28 3X5-105 5X6-0 02X^27+4X7 (F=71 8,R^2=0 653,α=0 05)The experience of K factor nomograph in USLE has been used for reference for convenient application of the soil index regressive equation as above, which is that the soil index value can directly be obtained through the soil index S nomograph , if the nomograph had been made In this article, the making principle and method of the S nomograph is introduced firstly The S nomograph is made by the method of 'Regressive Equation Analysis Orderly and Variables Transformed in Coordinate Axes' invented by the writer, which includes the several techniques of dimensions-division of the drawing space, drawing orderly, the disposal of approximate values of the soil index to be positive numbers, and white-box disposal The main innovative spots in the drawing techniques compared with that of the K nomograph are shown as follows: (1)The seven curves reflecting the corresponding independent variables in the regressive equation have reasonably been arranged in one chart by effectively using right angle Coordinate quadrant;(2) The S nomograph is effectively made without gradation of variables in the regressive equation, curves in the nomograph are comparatively distinctive, avoiding the trouble of consulting the gradation tables of the independent variables in use of the nomograph;(3) The S nomograph is reasonably made by the skill of fictitious coordinate axes;(4) The S nomograph can easily be drawn by using the most common drawing software, such as Excel or Photoshop In a word,the drawing method of 'Regressive Equation Analysis Orderly and Variables Transformed in Coordinate Axes' has the general significance toward the drafting of various multitude-variables correlative analysis plots in various subjects Notwithstanding,there are many problems to be solved in the making and application of the S nomograph
出处
《山地学报》
CSCD
2003年第5期615-619,共5页
Mountain Research
基金
中国科学院知识创新项目"中国水土流失宏观分析与评价研究"(99-01-05)
中国科学院知识创新重大项目"黄土高原区域水土保持环境效应与生态环境建设对策"(KZCX1-10-04)~~
关键词
土壤指数回归方程
K因子诺模图
土壤指数诺模图
序解轴转换法
Soil index regressive equation
K factor nomograph
the soil index nomograph
the method of regressive equation analysis orderly and variables transformed in coordinate axes
