不同秋眠級數(shù)苜蓿品種根系形態(tài)及吸水規(guī)律研究.pdf

1、镕a：—』L予。⑧西北農(nóng)林看捉大學2007屆攻讀碩士學位研究生學位(畢業(yè))論文不同秋眠級數(shù)莒蓿品種根系形態(tài)及吸水規(guī)律研究學科專業(yè)——堡』壁羔L—一研究方向—』睦些生盔堂一研究生昱塹衛(wèi)指導教師要圭童塾握壁擅羞副熬攫完成時間—』盟土生旦且一STUDYONROOTCHARACTERISTICSANDREGULA丌0NoF啪ERABSORPTl0NAMoNGALFALFACUI_TIVARSWITHDIFFERENTFALLDORⅣ【ANCYA

2、BSTRACTInordertesearchrootsystemcharacteristicsamongalfalfacultivarswithdifferentfalldormancysowedinspring，weusedcombinativemethodwhichconnecteddiagnostic—samplingoftheup—groundpartanddelaminated—analysingoftherootsystem

3、togetherFalldormancyisthemost’importantindexforintroducingalfalfaThisstudyshowedthatithadcloserelationbetweenfalldormancyandcharacteristicsoffighting—coldbuttherewasnotevidentconsistencybetweenfalldormancyanditsrootsyste

4、mcharacteristics，freshglaSSbiomassesCrowncharacteristieswereevidentlydifferentanaongdifferentalfalfacultivarsCrowndepthinsoil，crowndiameter，crownbranchingnumbersandbranchesdianaeterincreasedevidentlyinthefirstyearSeconda

5、rycrowndidnotappearuntilsecondcuttinginthesecondyearCro、】I，ndepUhinsoildecreasedwi廿1falldormancyincreasingStudyonrootsy毗cmcharacteristicsof15introducedalfalfacultivarsinthefirstyearTheresultsshowedthatthedeepesttaprootwa

6、sunderground1623cmSecondaryrootofAlfalfaeultivarsgrewmainlyfromthetaprootwhichunderground030cm，therewasnotsecondaryrootbelow40cmRootsystembiomassesandrootdiameterweredecreasedfromsurfacelayertodeeplayerStudyontherootsyst

7、emcharacteristicsof8introducedalfalfacultivarsinthesecondandthirdyearwhosefalldormancyare2，3，4，and6Theresultsshowedthatthedeepesttaprootwas305cmintheendofsecondyearRootsystemmainlygrewunderground60cmTheproportionofrootsy

8、membiomassesbelow60cmwas84％94％ofthetotalrootsystembiomasses，andtheproportionWasincreasingwiththevegetal)earextendingIntheendofthirdyearsecondaryrootofAlfalfacultivarsgrewmainlyfromthetaprootundergroundO～40cm“，thereWasnot

9、secondaryrootbelow60cmAndthesecondaryrootpositionWaSdescending、vimvegetalyearextendingInordertesearchtheregulationofwaterabsorptionof8alfalfacultivarswithdifferentfalldormancywestudiedtherelationshipofrootsystem，upground