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:1999210220;:2000206209:(49871053)(98W008):(19722),,,:100020585(2000)03203032081,1,1,2,2,2(11,100101;21,430000):,,--:;;;:S15815;S15711:A(slopeeco2engineering,SEE)[1],(contourhedgerows),,9612%,6515%,46%25[2],7817%2515%,,,,,[35],-[6],[711],19320009GEOGRAPHICALRESEARCHVol.19,No.3Sep.,2000©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,-,1,(Vetiveriazizanioides)310536,4km,101311mm,1617,240m,3464tökm2a4615(125),2510m,2m(20m2),199634,218m;,20cm,20cm,(1997510)1,42(422)12511997114Tab11Thetreatmentsandthesurfacesoilnutrientofeachplotbeforethesimulatingrain,Nov.,1997112NO32N2NH42N21212pH421918901507411830164122179015074136301511011878106422101470163440198013742117211179715025103981478110423-ö111620162319516111212501821106690100261641181867177424ö1115611063210171215681801511109277187291621531997173425ö13149018706816901986231950160331169211281581627180426-ö121341101513113011457251621107166168241872591767176:;199612423424115kg;425()88kg;42644kg,0175kg;199722015kg;61gökg,2mgökgSPRACO,4175m,0108MPa,90%,0190,8,111114mmömin02cm(,02cm),3min1000ml,1000ml,3min,NNO32N2MKClöNH42N2MKClö40319©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.--NaOHNaOH-015MNaHCO3-NaOH-1MNaOAC-pHpH2211,,[11]22Tab12Dataonsoillossofeachplotömmö(mmömin)öminömlög42156164111420755046549304225118011251600136300834423951981129270042605132424681101132103068635714258319811281100283505426871501130153022229122,,4224211619%2418%,,,422,4213,,,422421,422,80120mm,425426424425,425424,,,,,,,,[7],422,,()[12],[13],,[14],,,5033:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.(1139mmömin)(125)(4)534(A=0105)Tab13Regressionequationsofthecumulativerunoffandsedimentloss(A=0105)r2r2r2421R=-53481+12884T0199S=-31313+11418T0199S=16914+0100889R019915422R=-119893+5878T0197S=-82313+4110T0196S=1211+0100698R01999423R=-21995+608T0195S=-8115+214T0196S=611+0100391R019920424R=-26929+1272T0187S=-2714+113T0191S=116+0100103R019915425R=-9639+479T0191S=-212+011T0193S=011+0100022R019817426R=-9639+479T0199S=-212+011T0199S=011+0100022R019821:R(ml),S(g),T(min)422,4Tab14Theenrichmentratioofnutrientinsedimentö(gökg)ö(gökg)ö(mgökg)ö(gökg)ö(mgökg)ö(gökg)ö(mgökg)114311811192014611481110213111150195114511000199110611185Tab15Theestimatedvalueofnutrientlossinsedimentofeachplotögögömgögömgögömg42156107121375299102221500211280159143959216194221214870195765162001452513812219631891706423-ö21193011494915750106517158231868361243424ö1117401137281724010368118321313251256425ö0108801008016590100138012350111711832426-ö0121101023310250100591118401328712010102mm[12],[13],,,,-199611,0102mm17%1,,(0146)-,,;212,60319©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,,6,421,422425426NH42N()(199611,,),,,,,(),(2),,,421422421()6Tab16Thenutrientlossinrunoff421422423424425426NH42Nö(mgökg)011160185301943016500164001666NH42Nömg71967191012NO32Nö(mgökg)41079128101031512391381130NO32Nömg51318563168599118394192179161Nö(mgökg)51318571167618120394192179161Pö(mgökg)010050105301017010140102001000Pömg0168221258111670139701445Kö(mgökg)219534144515811129111702127Kömg402108513701603227118225517172091619:,;NNH42NNO32N,1,NO32NNH4-N,421NO32NNH42N,-NO32NNH42NNO32N423425426422,NO32N422,NO32N,425426422,,422,423424,423424,,426,,;,(423)2137033:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.77Tab17Thetotalnutrientlossontheslopeofeachplot422423424425426ög1147101221017550140301203718311452115259912759138ömg4581826712853711671177751345ö%114931403114221347101ömg61063191840913500163201773ö%1112511138121486218257158ög1591841241334410950137301538ö%0125516351556816138188ömg591179114061846252143825715492161820ö%6719497142901009912996168:(),421,,[12]-67,4-2()4216119%1814%2815%10010%9919%,(),,,,,424425426(NO32N),,42542650%,,-(),,,,424423423423425426422,425426,325,,-80319©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.(1),2418%1619%,,-013%,512%(2),(2),,(,,)-NO32N,-,(3),-,,,,-,-,-,,(4)-,,,,-(,44000kgöhm2):[1],WattD.[J].,1999,5(1):79285.[2],.[J].,1998,9(6):6652668.[3]DewaldCL,HenryJ,BruckerhoffSetal.Guidelinesforestablishingwarmseasongrasshedgesforerosioncontrol[J].Journalofsoilandwaterconservation,1996,51(1):16220.[4]PellekR.Contourhedgerowsandothersoilconservationinterventionsforhillyterrain[J].AgroforestrySystems,1992,17(2):1352152.[5]DabneySM,MeyerLD,HarmonWCetal.Depositionalpatternsofsedimenttrappedbygrasshedges[J].TrasctionsoftheASAE,1995,38(6):171921729.[6]LalR.Agroforestrysystemsandsoilsurfacemanagementofatropicalalfisol(Ê).Waterruoff,soilerosionandnutrientloss[J].AgroforestrySystems,1989,8(2):972111.[7],.[J].,1998,4(2):55260.[8].[J].,1994,14(3):2492254.[9],,.(SALT)[J].,1996,4(2):44249.[10].[J].,1998,53(2):1162121.[11],,.[J].,9033:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.1998,17(3):3092315.[12],,.[J].,1998,4(1):8213,21.[13],,.[J].,1999,5(2):23228.[14]GhadiriH,RoseCW.Sorbedchemicaltransportinoverlandflow:Ê.Enrichmentratiovariationwitherosionprocesses[J].JournalofEnvironmentalQuality,1991,20(3):6342641.Astudyonsoilnutrientlosscontrolbyslopeeco