
J. Jpn. Soc. Soil Phys.
/0,&¡
No. 3/, p. .+ /. ,**-

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***

Field Measurement of the Water Retention Curves and Simple Estimation of
Their Parameters for Soils in the Central Region of Horqin Sandy Land
Xiaoyan LIU*, Naomasa NISHIMURA**, Takao AMAYA** and Tingxi LIU**** United Graduate School of Agricultural Science, Gifu University** Faculty of Agriculture, Gifu University*** Faculty of Hydraulic and Civil Engineering, Inner Mongolia Agricultural University
Abstract
In this study, soil surveys and water retention measurements were conducted on a wide rangeof soil textures sampled from thirty one locations in the central hinterland of Horqin sandy land.
Because the measured water retention curves belong to intermediate scanning curves between
the main desorption and sorption processes, some precautions on measurement and application of
the water retention curves were suggested.
All soils in survey sites were classiﬁed into nine soil types.

The average water retention curveof each soil type could be su$ciently approximated by using van Genuchten formula (vG-I).
Their saturated and residual volumetric water contents (qs, qr) increased with clay contents ofsoil groups.

It was conﬁrmed that the shape of their water retention curves are reﬂected

precisely by the parameters e and n that describe the degree of the ﬁrst and second inﬂection
curvatures of vG-I, respectively.
Pedotransfer functions in the survey area were estimated using the water retention curves forthe nine soil types by the function parameter regression method. The parameters of the ﬁtted
water retention curves using vG-+ and vG-II (assumed m+ in vG-I)were known to have quite
good regression relations with the indexes of soil physical and chemical properties.

Particularly,

the accuracy of estimation was found to increase when the regression formulas of e and n were
substituted for m and n in vG-I.

Therefore, PTF is an e$cient method for estimating the water

retention curves for di#erent sites in the survey area.
Key words : Water retention curve, Horqin sandy land, Parameter regression method, Pedotransfer function, Physical and chemical properties of soil+    (,1+56,73#8!9:#;<$ =,(>?
@)/0AB,CDEF$ /0GHGIJ

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/

42

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*

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+,- ./01203

4 5$)

Z 3/ ¼ 6,**-=

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Salchow et al., +330 ; Scheinost et al., +331 ; Minasny

 !

6 78

"FGHIJ Pedo-

transfer K- 6PTF= #$L K- Tietje

and Tapkenhinrichs 6+33-= M5*N O PQRSTUV 6%WN&' XY( "Z)[\"*= ]- -K-^_

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et al., +333 ; Van Alphen et al., ,**+ ; Mcbratney etal., ,**,=

*~a {@  PTF

A' PTF Z3"x' { PTF =yῌ={B>JC{*'

 GIS

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STUVR  

R

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9:

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Haverkamp and Parlange, +320=~a  *0mz9:῍  

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& X

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6Cosby et al., +32. ;Nicolaeva et al., +320 ; Vereecken et al., +323= l῏+Fig. +@

G»Y

Location of experimental sites.

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43

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Layout for the ﬁeld measurement ofwater retention curve.

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44

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Fig. -

Distributions of soil water and total potential during the redistribution process after
rainfall of ./ mm on /, May, +33,.

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Fig. .

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Redistribution process of the soil water
after irrigating /* mm at the experimental site of A,..

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Fig. /

Water retention curves obtained byﬁeld measurements and the regression
curves.

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