不同氮素水平对叶菜型甘薯光合作用及生长特性的影响  

Photosynthetic and growth characteristics of vegetable-use sweet potato responding to nitrogen application rates

作　　者：魏猛[1] 唐忠厚[1] 陈晓光[1] 李洪民[1] 张爱君[1] 史新敏[1] 

机构地区：[1]江苏徐淮地区徐州农业科学研究所,江苏徐州221131

出　　处：《江苏农业学报》2014年第1期87-91,共5页Jiangsu Journal of Agricultural Sciences

基　　金：江苏省农业科技自主创新基金项目[CX(12)5078];国家甘薯产业技术体系(CARS-11-B-13)

摘　　要：为了探讨不同氮素水平对叶菜型甘薯光合作用及生长特性的影响,本试验以徐菜薯1号作为试验材料,研究4个氮素水平下其叶绿素含量、光合速率、气孔导度、胞间CO2浓度、蔓长和各部位生物产量的变化。结果显示:与不施尿素处理(对照)相比,施尿素处理(每盆施尿素6.5 g、每盆施尿素13.0 g和每盆施尿素26.0 g)的叶绿素含量、光合速率、气孔导度和地上部干质量均显著增加,每盆施尿素6.5 g和13.0 g处理的蔓长和地下部生物产量均显著增加;每盆施尿素26.0 g处理的蔓长和地下部生物产量均显著降低;施尿素处理的胞间CO2浓度均显著降低。相关性分析结果显示,薯蔓长度、叶片干质量、叶柄干质量、茎干质量、块根干质量、纤维根干质量、地上部干质量和地下部干质量与叶绿素含量、光合速率、气孔导度均呈正相关,其中叶片干质量、茎干质量和地上部干质量与光合速率和气孔导度相关性均达显著或极显著水平,而与胞间CO2浓度均呈负相关。表明适量氮肥有利于叶菜型甘薯光合作用和生物产量形成。The changes of chlorophyll content, photosynthetic rate, stomatal conductance, internal CO2 concentration,vine length and biomass of Xucaishu No.1 with 4 levels of nitrogen application were studied. The results showed that com-pared to non-urea application treatment（CK）, urea application （the nitrogen levels of 6.5 g per pot, 13.0 g per pot and 26.0 g per pot） could significantly improve the chlorophyll content, photosynthetic rate, stomatal conductance and abovegroundbiomass, and the treatments of the nitrogen levels of 6. 5 g per pot and 13. 0 g per pot could significantly enhance the vinelength and underground biomass. The treatment of 26.0 g urea per pot could significantly reduce the vine length and under-ground biomass. The internal CO2 concentration in urea application treatments droped. The dry weights of leaves and stems,and aboveground biomass were positively correlated with thephotosynthetic rate and stomatal conductance. Therefore, aproper amount of nitrogen application could be in favor forphotosynthesis and biomass.

关 键 词：氮水平 叶菜型甘薯 光合特性 生长特性 

分 类 号：S531.062[农业科学—作物学]