Page 218 - 《水资源与水工程学报》2025年第1期
P. 218
!36 "!1 # & ' ( ) & * + , - Vol.36No.1
2025 $ 2 % JournalofWaterResources&WaterEngineering Feb.,2025
DOI:10.11705/j.issn.1672-643X.2025.01.24
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KLMNO:S152.7 PQRST:A PUVO:1672643X(2025)01021410
Developmentoffieldcapacitypedotransferfunctions
forsubtropicalsoilsinChina
WUYingu,QINLu,TIANZhengchao
(CollegeofResourcesandEnvironment,HuazhongAgriculturalUniversity,Wuhan430070,China)
)isanimportantparameterforassessingsoilwaterholdingcapacityandag
Abstract:Fieldcapacity( θ f
riculturalirrigationmanagement ,whichisalsoarequiredinputvariableformanyhydrologicmodels.The
isessential,becausedirectmeasurementof
developmentofpedotransferfunctions (PTF)forpredicting θ f
weredevelopedmainly
soil θ f isbothtimeconsumingandcomplicated.ExistingPTFsforpredictingθ f
basedonsoildatafromtropicalandtemperateregions,andtheirapplicabilitytosoilsinsubtropicalre
gionsisunknown.ItisnecessarytodevelopanewPTFwhichisapplicabletosubtropicalsoilsinChina.
),organicmattercontent
Inthisstudy ,wemeasuredtheθ f valuesandsoiltexture,bulkdensity( ρ b
(f)informationofsoilsfrom175runoffplotsintypicalsubtropicalregionsofChina.Theaccuracyof
om
valuesofthein
mainexistingPTFswereevaluatedbycomparingthepredictionresultswithmeasured θ f
vestigatedsoils.Besides ,wedevelopedanewPTFsuitableforsubtropicalsoilsusingamultivariatestep
wasgenerallyunderestimatedby
wiselinearregressionanalysismethod.Theresultsshowedthatsoil θ f
the11mainexistingPTFs,ofwhichonlythePTF3fromHunan,Chinaproducedrelativelyacceptablees
3
3
3
3
)andameanbias( ε )of0.051m /m and-0.024m /m,
timateswitharootmeansquareerror( ε r
!"#$:20240626; %$:20240928
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