CAJ | 학술논문

以甘农3号和陇东苜蓿为研究材料,采用营养液砂培法,比较研究了 NH 4+-N 0、105、210、315、420 mg/L 5个水平对紫花苜蓿光合色素及光合特性的影响。结果表明：供氮处理下2个品种紫花苜蓿的光合速率、气孔导度、叶面积和叶绿素含量均显著高于 CK(P <0.05),并随供氮水平的增大先增加后减小,在210 mg/L 达到最大。紫花苜蓿胞间 CO2浓度随氮素水平的提高而降低,N210对紫花苜蓿叶片光合性能调节作用最大。2个品种对 N210氮素水平的敏感度最高,且在 N210处理下,甘农3号的光合速率、气孔导度和叶绿素含量对氮素的敏感度高于陇东苜蓿；而陇东苜蓿叶面积和胞间 CO2浓度对氮素的敏感度高于甘农3号。
이감농3호화롱동목숙위연구재료,채용영양액사배법,비교연구료 NH 4+-N 0、105、210、315、420 mg/L 5개수평대자화목숙광합색소급광합특성적영향。결과표명：공담처리하2개품충자화목숙적광합속솔、기공도도、협면적화협록소함량균현저고우 CK(P <0.05),병수공담수평적증대선증가후감소,재210 mg/L 체도최대。자화목숙포간 CO2농도수담소수평적제고이강저,N210대자화목숙협편광합성능조절작용최대。2개품충대 N210담소수평적민감도최고,차재 N210처리하,감농3호적광합속솔、기공도도화협록소함량대담소적민감도고우롱동목숙；이롱동목숙협면적화포간 CO2농도대담소적민감도고우감농3호。
Under the condition of complete nutrient solution,the effect of 5 nitrogen levels (0,105,210,315 and 420 mg/L)on photosynthetic pigments and photosynthetic characteristics of Medicago sativa cv.Gannong No.3 and M.sativa cv.Longdong was studied through sand culture method.The results showed that the photo-synthetic rate,stomatal conductance,leaf area and chlorophyll content under nitrogen treatment were signifi-cantly higher than CK (P <0.05),and they increased at beginning and then decreased with the increase of nitro-gen level (reached the highest while nitrogen level was 210 mg/L).The intracellular CO2 concentration de-creased along with increasing nitrogen level.Treatment N210 performed the best photosynthetic efficiency.The response sensitivity of two varieties was the highest under treatment N210,and the photosynthetic rate,stomatal conductance and chlorophyll content of Gannong No.3 was higher than Longdong,in contrast,the leaf area and intracellular CO2 concentration of Longdong were higher than Gannong No.3.