黄绵土水分运移的指数衰变规律——以某残塬顶面为例
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摘要
为认识黄绵土根系层(1 m)水分时间动态变化的规律,应用土壤水分运移指数衰变模型,对水分变化进行拟合和分析。黄绵土水分运移指数模型模拟中,在拟合根系层土壤含水量上,精确度良好。其中3 d尺度的衰变系数k_(3d)方程能精确表示土壤水分1 h尺度和1 d尺度变化特征。1 h尺度土壤水分变化,以5%误差限为标准:正衰变系数k_(3d)方程拟合精度为99.71%,负衰变系数k_(3d)方程拟合精度为98.91%;其中1 d尺度的水分变化,5%误差限为标准:正衰变系数k_(3d)方程拟合的精度为88.28%,负衰变系数k_(3d)方程拟合精度为88.80%。利用指数衰变系数k_(3d)模型的拟合结果可以满足农业生产需要的水分含量精度,同时认识地域性黄绵土土壤水分的短缺性。
To understand the change of water content in root-layer of loessal soil(1 m),the model of soil moisture migration index decay was used to fit and analyze the water change.In the simulation of soil moisture migration index model of loess soil, the accuracy of fitting soil water content in root-layer was good.Among of them, the decay coefficient k_(3 d) equation of 3 d-scale can accurately represent the variation characteristics of soil moisture in relative 1 h and 1 d scale.According to the error limit of 5%, the fitting accuracy of positive decay coefficient k_(3 d) equation was 99.71% and that of negative decay coefficient k_(3 d) equation was 98.91% within 1 h scale.The accuracy of fitting positive decay coefficient k_(3 d) equation was 88.28%, and that of negative decay coefficient k_(3 d) equation was 88.80% within 1 d scale.The fitting results of exponential decay coefficient k_(3 d) model can meet the needs of accuracy to soil content in agricultural production.At the same time, we can know the shortage of soil moisture on the regional loessal soil.
To understand the change of water content in root-layer of loessal soil(1 m),the model of soil moisture migration index decay was used to fit and analyze the water change.In the simulation of soil moisture migration index model of loess soil, the accuracy of fitting soil water content in root-layer was good.Among of them, the decay coefficient k_(3 d) equation of 3 d-scale can accurately represent the variation characteristics of soil moisture in relative 1 h and 1 d scale.According to the error limit of 5%, the fitting accuracy of positive decay coefficient k_(3 d) equation was 99.71% and that of negative decay coefficient k_(3 d) equation was 98.91% within 1 h scale.The accuracy of fitting positive decay coefficient k_(3 d) equation was 88.28%, and that of negative decay coefficient k_(3 d) equation was 88.80% within 1 d scale.The fitting results of exponential decay coefficient k_(3 d) model can meet the needs of accuracy to soil content in agricultural production.At the same time, we can know the shortage of soil moisture on the regional loessal soil.
引文
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[2] FAROUK B A,MICHEL A,RICHARD S,et al.Numerical simulations of water flow and contaminants transport near mining wastes disposed in a fractured rock mass[J].International journal of mining science and technology,2015,25(1):37-45.
[3] 雷志栋,杨诗秀,谢森传.土壤水动力学[M].北京:清华大学出版社,1988:10.
[4] 尚松浩,毛晓敏,雷志栋,等.土壤水分动态模拟模型及其应用[M].北京:科学出社,2009:29.
[5] 王文焰,汪志荣,王全九,等.黄土中Green-Ampt入渗模型的改进与验证[J].水利学报, 2003(5):30-34.
[6] 程立平.黄土塬区深剖面土壤水分特征及其补给地下水过程研究[D].西安:中国科学院大学(中国科学院教育部水土保持与生态环境研究中心), 2013.
[7] 米海存,何红曼,姜婷婷.近年来黄土渗透系数的研究现状[J].科技创新导报, 2014(2):25.
[8] 李海防,卫伟,陈利顶,等.黄土高原林草地覆盖土壤水量平衡研究进展[J].水土保持研究,2013,20(1):287-293.
[9] 李鹏展,王力,王棣.黄土旱塬区冬小麦土壤水库动态[J].应用生态学报,2017,28(11):3653-3662.
[10] 雷志栋,胡和平,杨诗秀.土壤水研究进展与评述[J].水科学进展,1999,10(3):311-318.
[11] 李玉山.黄土高原森林植被对陆地水循环影响的研究[J].自然资源学报,2001,16(5):427-432.
[12] ERROUISSI F,MOUSSA-MACHRAOUI S B,BEN-HAMMOUDA M,et al.Soil invertebrates in durum wheat (Triticum durum L.) cropping system under Mediterranean semi arid conditions: A comparison between conventional and no-tillage management[J].Soil & tillage research,2010,112(2):122-132.