CAJ | 학술논문

研究了无土基质栽培的不同氮素水平(1,3,8,16,26 mmol/L)和氮素形态配比(NH_4~+;-N:NO_3~-;-N分别为4:0,1:3,2:2,3:1,O:4)对小菊外观品质、叶绿素含量和光合特性的影响.结果表明,氮素水平为16 mmoL/L时对小菊营养生长期较适宜,能显著提高株高、冠幅、植株鲜重和叶片数等;而8 mmol/L氮素水平适于花发育期需求,利于提高单株花序数、花干重和延长花期,高浓度的氮素对花发育和开花不利,但提高叶绿素含量、净光合速率(Pn)、气孔导度(Gs)和蒸腾速率(Tr),降低胞间CO_2:浓度(Ci).以NH_4~+-N部分代替NO_3~--N可显著提高小菊株高、冠幅、叶片数、植株鲜重和单株花序数量等指标,且在营养生长后期显著提高叶绿素含量和净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr),降低胞间CO_2浓度(Ci),但对于花发育进度和整体花期无显著影响,研究表明,盆栽小菊NH_4~+-N:NO_3~--N的适合比例为3:1.
연구료무토기질재배적불동담소수평(1,3,8,16,26 mmol/L)화담소형태배비(NH_4~+;-N:NO_3~-;-N분별위4:0,1:3,2:2,3:1,O:4)대소국외관품질、협록소함량화광합특성적영향.결과표명,담소수평위16 mmoL/L시대소국영양생장기교괄의,능현저제고주고、관폭、식주선중화협편수등;이8 mmol/L담소수평괄우화발육기수구,리우제고단주화서수、화간중화연장화기,고농도적담소대화발육화개화불리,단제고협록소함량、정광합속솔(Pn)、기공도도(Gs)화증등속솔(Tr),강저포간CO_2:농도(Ci).이NH_4~+-N부분대체NO_3~--N가현저제고소국주고、관폭、협편수、식주선중화단주화서수량등지표,차재영양생장후기현저제고협록소함량화정광합속솔(Pn)、기공도도(Gs)、증등속솔(Tr),강저포간CO_2농도(Ci),단대우화발육진도화정체화기무현저영향,연구표명,분재소국NH_4~+-N:NO_3~--N적괄합비례위3:1.
Substrate culture was employed to study the effects of different nitrogen levels(i.e.,1,3,8,16,26mmol ·L~(-1))and different ratios of nitrogen forms(i.e.,NH_4~+-N to NO_3~--N,4:0,1:3,2:2,3:1,0:4) on appearance quality,chlorophyll content and photosynthesis characters of chrysanthemum with small infloreseences.The results showed that 16 mmol·L~(-1) nitrogen was optimal for vegetative growth,and it increased plant height,canopy,fresh weight and leaf numbers of plant.On the other hand,8 mmol·L~(-1),nitrogen Wag optimal for reproductive growth,and it increased flower numbers,flower dry weight and prolonged the period of blooming.The flower development and its blooming were inhibited at higher level of nitrogen,but the chlorophyll content,net photosynthetic rate(Pn),stomatal conductance (Gs) and transpiration rate (Tr) increased and the intercellular CO_2 concentration (Ci) decreased.Plant height,canopy,leaf numbers,flowers numbers,flower dry weight were enhanced under NH_4~+-N condition as compared to NO_3~--N.Furthermore,the chlorophyll content,net photosynthetic rate (Pn),transpiration rate(Tr)and stomatal conductance (Gs) increased,but the intereelhlar CO_2 concentration (Ci) obviously decreased during the late period of vegetative growth under NH_4~+-N condition.However,nitrogen forms didn't affect the progress of flower development or the blooming period.It was found that a ratio of 3:1 of NH_4~+-N:NO_3~--N was optimal for potted chrysanthemum with small inflorescences.