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Soil Water Dynamics of Degraded Grassland on the Slope of the Loess Plateau

黄土高原坡地退耕恢复草地的土壤水分动态



全 文 :!23" !6#
 Vol.23  No.6
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犱狅犻:10.11733/j.issn.10070435.2015.06.008
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犛狅犻犾犠犪狋犲狉犇狔狀犪犿犻犮狊狅犳犇犲犵狉犪犱犲犱犌狉犪狊狊犾犪狀犱狅狀狋犺犲犛犾狅狆犲狅犳狋犺犲犔狅犲狊狊犘犾犪狋犲犪狌
YICaiqiong1,WANGSheng2,FANJun1,2
(1.StateKeyLaboratoryofSoilErosionandDrylandFarmingontheLoessPlateau,InstituteofSoilandWater
Conservation,NorthwestA&FUniversity,Yangling,ShaanxiProvince712100,China;
2.StateKeyLaboratoryofSoilErosionandDrylandFarmingontheLoessPlateau,InstituteofSoilandWater
Conservation,ChineseAcademyofSciences,Yangling,ShaanxiProvince712100,China)
犃犫狊狋狉犪犮狋:Inordertounderstandthesoilwaterdepletionandreplenishmentafterreturningfarmlandto
grasslandontheslopinginthewaterwinderosionregionoftheLoessPlateau,soilmoisturedynamics
wereobservedunderdifferentlandusetypes.Resultsshowthatthesoilwatercontentofthegrassland
(alfalfa)decreaseddistinctlyandwatercontentwasclosetothewiltingpointafteralfalfawasplantedfor
manyyears.Despiteofhavingmorerunoff,thesoilwatercontentwasinahigherlevelinthefarmland.
Theaveragewatercontentsofgrassland,abandonedlandandfarmlandwere7.4%,12.6%and12.5%at
thebeginningofthegrowingseasonin2010,respectively.Soilwaterwasrechargedtodifferentlevelsun
derdifferentlandusetypesinthewetteryear,andtherechargingdepthinthewetteryearwasdeeperthan
normalyear.Thesoilwatercontentsofalfalfaland,abandonedlandandfarmlandwererestoredto
10.0%,14.5%,15.5%,andthesoilmoistureincreasedby35.1%,15.1%,24.0%,respectively.Asa
result,thesoilwatercontentdecreasedsignificantlybyreturningfarmlandtograssland,andthedistinct
recoveryofsoilwatercontentwasobservedonlyinthewetteryear.
犓犲狔狑狅狉犱狊:TheLoessPlateau;Soilmoisture;Returningfarmlandtograssland;Thewetteryear
CDEF
:20140516;GHEF:20140728
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Table1 Themeansoilmoisturecontentsin0~260cmunderdifferentlandusetypes
2010$/% 2011$/% 2012$/% 2013$/% ã¸I Mean/%
UV? Alfalfaland 7.1 7.0 7.0 8.7 7.5c
YÔ? Abandonedland 12.0 12.3 11.3 12.8 12.1b
Ğ?Farmland 12.6 12.2 12.0 14.4 12.8a
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underdifferentlandusetypes
v2 () ¥xxer0~260犮犿 ãy“?Ѝţ
Table2 Annualchangesofsoilwaterstoragein0~260cmunderdifferentlandusetypes
µ†
Items
2010$AÍ;z/
;dcŒº犠狊狋犪狉狋
/犠犲狀犱in2010/mm
2011$AÍ;z/
;dcŒº犠狊狋犪狉狋/
犠犲狀犱in2011/mm
2012$AÍ;z/
;dcŒº犠狊狋犪狉狋/
犠犲狀犱in2012/mm
2013$AÍ;z/
;dcŒº犠狊狋犪狉狋/
犠犲狀犱in2013/mm
4$AÍcŒº
lã¸I
Mean/mm
UV?
Alfalfaland
270.5/263.5 302.3/234.1 269.2/272.0 271.7/359.6 273.6b
YÔ?
Abandonedland
473.6/437.5 522.7/456.4 437.6/432.9 448.4/545.6 460.4a
Ğ?
Farmland
468.6/442.1 505.8/457.8 431.1/475.0 463.7/588.1 481.2a
v3 () ¥xxer0~260犮犿 ãy“?z{d|}~
Table3 Soilwaterdepletionandreplenishmentin0~260cmunderdifferentlandusetypes
µ†
Items
2010$AÍcŒºrí/
ƒñUÐ
犠犇/犠犐in2010/mm
2011$AÍcŒºrí/
ƒñUÐ
犠犇/犠犐in2011/mm
2012$AÍcŒºrí/
ƒñUÐ
犠犇/犠犐in2012/mm
2013$AÍcŒºrí/
ƒñUÐ
犠犇/犠犐in2013/mm
UV?
Alfalfaland
8.04/-7.0 -46.0/-68.3 29.35/2.8 50.1/88.0
YÔ?
Abandonedland
-2.61/-36.1 -58.6/-66.3 11.81/-4.7 33.9/97.3
Ğ?
Farmland
16.1/-26.5 -45.1/-47.9 44.29/43.9 90.0/124.5
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Table4 Comparisonofsoilwaterconsumptionandcompensationdepthsunderdifferentlandusetypes
µ†
Items
2010$rí/ƒñÚÐ
Depletion/
infiltrationdepth/cm
2011$rí/ƒñÚÐ
Depletion/
infiltrationdepth/cm
2012$rí/ƒñÚÐ
Depletion/infiltration
depth/cm
2013$rí/ƒñÚÐ
Depletion/
infiltrationdepth/cm
UV?
Alfalfaland
140Ab/130Abc >260Aa/70Ac 220Ab/180Bab 140Bb/200Ba
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