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Effects of Desertification on Soil Nutrients and Root-shoot Ratio in Desert Steppe

荒漠草原沙漠化对土壤养分与植被根冠比的影响



全 文 :!23" !3#
 Vol.23  No.3
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TANGZhuangsheng1,ANHui2,SHANGGUANZhouping1
(1.StateKeyLaboratoryofSoilErosionandDrylandFarmingontheLoessPlateau,NorthwestA&FUniversity,Yangling,Shaanxi
Province712100,China;2.KeyLaboratoryofRestorationandReconstructionofDegradedEcosysteminNorthwesternChinaofMinistry
ofEducation,NingxiaUniversity,Yinchuan,NingxiaProvince750021,China)
犃犫狊狋狉犪犮狋:Thechangesofsoilnutrientsandplantbiomasswereanalyzedbyspatialmethodinsteadoftime
methodindifferentdesertificationstagesinordertodiscusstheresponseofsoilnutrientandrootshootra
tiotodesertificationinthenorthcentralNingxia,China.Theresultsshowedthatdecreasedfromlightde
sertificationstagetoveryseveredesertificationstagewiththedevelopmentofgrasslanddesertification,
whileabovegroundandbelowgroundbiomassinlightdesertificationstagewashigherthaninpotentialde
sertificationstage.Thechangetrendofrootshootratiogradualydeclinedwiththedevelopmentofgrass
landdesertification,whiletherootshootratioinseveredesertificationstageincreasedby36%comparedto
moderatedesertificationstage.Theorganiccarbon,totalnitrogen,totalphosphorus,availablenitrogen
andavailablepotassiumofsoildecreasedfrompotentialdesertificationstagetoveryseveredesertification
stage;whilesoilavailablephosphorusdecreasedfrompotentialdesertificationstagetomoderatedesertifi
cationstage,andincreasedatseveredesertificationstage,thendecreasedatveryseveredesertification
stage.Comparedwithmoderatedesertificationstage,thesoilavailablephosphorusofseveredesertification
stageincreasedby4%,buttherewasnosignificantdifferencebetweenmoderatedesertificationandsevere
desertificationstage.There was significantly positive correlation between total phosphorus and
abovegroundbiomass,belowgroundbiomass,rootshootratio.Thedesertificationreducedsoilfertility
andcausedgrasslandproductivitydecline.
犓犲狔狑狅狉犱狊:Desertsteppe;Desertification;SoilNutrient;Rootshootratio
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Fig.1 Changesofabovegroundandbelowgroundbiomass
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differentdesertificationstagesat0.05level,PD:potential
desertificationstage;LD:lightdesertificationstage;MD:
moderatedesertificationstage;SD:severedesertificationstage;
VSD:veryseveredesertificationstage.Thesameasbelow
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Fig.2 Changesofrootshootratiocharacteristics
intheprocessofgrasslanddesertification
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Table1 Changesofsoilnutrientcharacteristicsintheprocessofgrasslanddesertification
¿¥
Item
Âf,ÁPD
}e,ÁLD
8e,ÁMD
~e,ÁSD
9e,ÁVSD
âýį"SOC/% 0.230±0.01a 0.180±0.02b 0.120±0.03c 0.100±0.02cd 0.080±0.02d
Ãů"TP/% 0.041±0.002a 0.040±0.000a 0.038±0.001b 0.037±0.001bc 0.035±0.003c
̯"TN/% 0.020±0.001a 0.016±0.002b 0.009±0.002c 0.006±0.000d 0.006±0.001d
û>¿¯"AK/mg·kg-1 83.270±27.08a 82.480±4.72a 56.230±7.96b 55.930±1.78b 55.850±0.48b
û>ů"AP/mg·kg-1 2.110±0.37a 1.950±0.09ab 1.860±0.03ab 1.930±0.11ab 1.750±0.32b
û>Œ¯"AN/mg·kg-1 9.000±1.35a 6.130±1.01b 5.740±0.35bc 5.130±1.33bc 4.920±0.28c
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Note:Differentlettersinthesamerowindicatesignificantdifferenceamongdifferentdesertificationstagesat0.05level.SOC:soilorganic
carbon;TP:totalphosphorus;TN:totalnitrogen;AK:availablepotassium;AP:availablephosphorus;AN:availablenitrogen.Thesameas
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Table2 Therelationshipsamongabovegroundbiomass,belowgroundbiomass,rootshootratioandsoilnutrient
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TN
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Abovegroundbiomass
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Belowgroundbiomass
0.759 0.748 0.735 0.806 0.108 0.444
ˆ}tR/S 0.751 0.784 0.754 0.649 0.125 0.356
  •:f0.01Éu†œ‹¬·;f0.05Éu†œ‹¬·;n=5。SOC+ÅâýÄ;TP+ÅÃÅ;TN+ÅÌ;AK+Åû>¿;AP
+Åû>Å
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Note:indicatessignificantcorrelationatthe0.01level,andindicatessignificantcorrelationatthe0.05level,n=5.SOC:soilor
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