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植被对水土流失和水源涵养的影响Vertical
vegetationstructures;Plantdiversity;Vegetation
spatialdistributionMultidimensionalanalysisoftheeffectsofvegetationonrunoffandsoilloss(CrockfordandRichardson,2000;Lietal.,2014;Quintonetal.,1997;Janssensetal.,1998;Martinetal.,2010;Puigdefabregas,2005;Bochetetal.,1998;Fengetal.,2012;Luetal.,2012;Liuetal.,2018;
)EFFECTSOFVEGETATION
INMINIMIZING
EROSIONAbsorbs the energy offallingrain;Removes water from soilandtranspiresitintothe
air;Roots hold surface soil andstabilizebank
materials;Helpsthegroundtoabsorb
water;Slows the runoff velocity
andtraps
sediment.Questions discussedinthisresearch
:1. How does the vegetation coverage andlitter coverage influence soilprocess? What is the dynamicof soil water infiltrationerosionprocessduringrainfall?2. Theregulationmechanismofvegetationcoverageonsoil
erosion?MethodsMeasuringexperimental
indexesGrass:CarexShrub:TwigsoftheCHASTE
TreeRunoff
bucketPrecondition
of
experiment Rainfallsimulation
experimentVegetationcoverage/LittercoverageRainfallintensity:
60mm/hDurationofrainfall:60minSlope:15°VegetationCoverage:0,25%,50%,
75%,100%;LitterCoverage:0,50,100,150,200,
250g/m2Control
conditionMethods1000800600400200012000
1020304050Surfacerunoff
rate(mL/min)60Time025%50%75%100%Fig.1Dynamicchangesofsurfacerunoffrateandsedimentrateunderdifferentvegetationcoverage
conditionsSlopeRunoffandSediment
ProcessSedimentrate
(g/min)20.0018.0016.0014.0012.0010.008.006.004.002.00Time0.000102030405060025%50%75%100%110010009008007006005004003002001000SurfaceRunoff
(ml/min)Time/min0 5 10 15 20 25 30 35 40 45 50 55 60 650g50g100g150g200g250gFig.2DynamicchangesofsurfacerunoffrateandsedimentrateunderdifferentLittercoverage
conditionsEffectsofvegetationandlittercoverageonsoilerosion
process1.201.000.800.600.400.200.00Infiltration
rate(mm/min)0 10 20 30 40 50 60Durationof
rainfall(min)025%50%75%100%Fig.3DynamicchangesofSoilmoistureincrement
and
soil Fig.4DynamicchangesofSoilmoistureincrementandsoilinfiltrationrateunderdifferentvegetation
coverage
conditions infiltrationrateunderdifferentLittercoverage
conditions141210864200 10 20 30 40 50 60 7090Soilmoisture
increment80Time(min)025%50%75%100%SlopeSoilInfiltration
Process10.009.008.007.006.005.004.003.002.001.000.000 10 20 30 40 50 60 70Soilmoisture
increment80 90Time/min0g50g100g150g 200g 250g0.800.600.400.200.001.000 10 20 3050 60Infiltration
rate(mm/min)40Time
(min)0g 50g 100g150g 200g 250gEffectsofvegetationandlittercoverageonsoilerosion
processWith the increment of vegetation and litter
coverage, soil moistureincreasedandthesurfacerunoffrate
decreased.Itshowsthatmorewaterwasusedforinfiltration,andthusincreasedsoilmoisturewiththeincrementofvegetationandlittercoverage.Vegetationandlittercoveragecanachievegoodwaterstorage
effect.Effectsofvegetationandlittercoverageonsoilerosion
processEffectsofvegetationcoverageonhydrodynamic
parametersFig.5Variationofmeanvelocityofslopeflowwithvegetation
coverageTal.1FittedEquationsofSlopeRunoffVelocity
withDifferentVegetation
CoverageWiththeincrementofvegetationcoverage,theKvaluedecreased,Itindicatesthattheroughertheslopewas,thesmallertheVvalue
was.Effectsofvegetationcoverageonrunoff
velocityKisthecoefficientrelatedtotheroughnessofslope
surface.V=K·Jn·qmEffectsofvegetationcoverageonhydrodynamic
parametersEffectsofvegetationcoverageonrunoffmorphologyandresistance
characteristicsTal.1Characteristicsofhydrodynamicparametersofsloperunoffunderdifferent
coverageLaminar
flowSlow
flowFig.6ResistanceCoefficient(f)ofSlopeFlowunderDifferentVegetation
CoverageVegetationcoveragecanreducetherunoffvelocityontheslope,alleviatetherunoffmorphologyandincreasethesurfaceresistance
coefficient.Vegetationcangreatlyincreasetheroughnessofslopes.Withtheincrementofvegetationcoverage,theresistanceofrunoffonslopesbecomedlargerandlarger.Themoreenergyofrunoffwasusedtoovercomeresistance,thelessenergywasusedforerosionandsedimenttransport,theweakersoilerosionwas.Effectsofvegetationcoverageonsoilshearstrengthand
anti-erodibilityTal.2soilinternalfrictionangle(φ),soilcohesionforce(C)andshearstrength(τf)ondifferentvegetationcovered
slopesItshowsthatcohesionforce(C)andinternal
frictionangle(φ)increasedsignificantlyofBE,
IE,AEcomparedwithBFandbarelandinall
vegetationcoverages.Withtheincrementofsoilmoisturecontent,theCandφdecreased,whichindicatesthatthesoilshearstrength
decreased.TheCandφdecreasedaftertheexperiment,whichindicatesthatCandφwerenotonlyaffectedbythecoverageconditions,butalsoaffectedbythemoisturecontentofvegetationslope.VegetationcoverageincreasedtheCandφ,which
hadastrongeffectofsoilconsolidationanderosion
resistance.Fig.7Fullyautomatictriaxialcompressioninstrument1.FieldObservation
Experimentwaterbalance
experimentMeasuring
WeirLysimeterSystemsSap
flow(Vegetationtranspiration)Through
fallStem
flowSoil
waterSubsequent
WorkThewaterbalancefactorsofsoilevaporation,vegetationtranspiration,canopyinterception,soilmoistureandlitterholdingcapacityofdifferentvegetationtypesweremonitoredbyfieldfixed-point
monitoring.2.StandardRunoff
PlotsSubsequent
Work3.FieldRai
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