水肥耦合對6種禾本科牧草種子產量和生產性能的效應.pdf

1、中國農業(yè)大學博士學位論文水肥耦合對6種禾本科牧草種子產量和生產性能的效應姓名：王佺珍申請學位級別：博士專業(yè)：草業(yè)科學指導教師：周禾韓建國20050501AbstractBasedonmulti_factororthogonaldesignedfieldexperimentanalysiswithbigsamplesthestudieswereconductedintwoconsecutiveyears(20032004)todeterm

2、inethecouplingefleetsandinteractionsoffertilizerapplication，irrigationanddensitymanipulationonseedyield，yieldcomponentsandqualityparametersof6grassesspeciesElytrigiasmithii(Rydb)Nevski，BromusinermisL，DactylisglomerataL，F(xiàn)

3、estucaarundinaceaL，PhleumpratenseL，andPsathyrostachysjuneeaNevski，inJiuquan，GansuprovinceThemainresultsindicatedthat：1Totheseedyieldofthe6grasses，themostproductiveseedyieldcomponentisfertiletillersm一，exceptthatofPhleumpr

4、atenseLisspikeletsfertiletillers。2Ridgeregressionmodelsofthe6speciesgrassesindicatedthat，increaseseedyield02130～21876kg／hm2whenincreaselunitoffertiletillersm～inarangeof91153，increaseseedyield0147缸185038kgmm‘，718484173830

5、kg舳∥，3201～330912kg／hm2and209589466325kg／hm2，whenincrease1unitofspikeletsfertiletillers～，floretsspikelet“1，seednumbersspikelet1andseedweight，respectively3Theoptimaltechnologyontheseedyieldsofthe6grassesweresuggestedasfoll

6、owing：FestucaarundinaeeaL，appliednitrogen20483—21856kg／hm。，appliedphnsphorris13504～12845k耐，irrigation8536～8552ram，timeofappliedfertilizerisatthetimeofStemelogation，plantdensityat404X104shoots／hm2；eNrigiasmithii(Rydb)Nevs

7、ki：appliednitrogen160—1649kg／hm2appliedphosphorus105kg／hm2，timeofappliedfertilizerisinlastautumn，plantdensityat4294450104shoots／hmz，sprayingplantregulatorPP333，O1970233aikglhm‘；PhleumpratenseL：appliednitrogen9882—8307kg／

8、hm。，appliedphosphorus69966228kg／hm2，irrigation84088589ramtimeofappliedfertilizerisinlastautumnplantdensityat458104$hoots／hrn2Bromusinerm話L：appliednitrogen2126一22098kg／hm2，appliedphosphorusl3110105kg／hm‘，irrigation9131947

9、4mm，timeofappliedfertilizerisinlastautumnplantdensityat169104shoots／hm2；PsathyrostachysjunceaNevski：appliedniUogen20931kg／hm2，appliedphosphorus14092kg／hm2kg／hm2，irrigation75，67mm，plantdensityat184104shoots／hm2；Dactyl括glo

10、merataL：appliednitrogen2294虬之463kg／hra2appliedphosphorusl506917994kg／hm2irrigation8753—7077ram，timeofappliedfertilizerisatthetilleringtimeplantdensityat3553“4309X104shoots／hm2，sprayingplantregulatorPP333，O2l~o22aikg／hm2；

11、4Theeffectofni仃ogenismoreproductivethanphosphorusonBromasinermisLseedyield，whereasphosphorusismorethannitrogenonPhleumpratenseLseedyield；NitrogenandphosphorusissynergistictyperesponsetotheyieldsForthehighestseedyield，the

12、factorsCanbeadjustedaccordingtotheequilibriumequationofnitrogenandphosphoruseffects5AppliednitrogenisthefirsteffectivefactorintermsofeffectonElytrigiasmithii(Rydb)NevskiandDactylisglomerataLseedyieldanddensityofplanting，