摘要
为了研究施氮量对马铃薯全生育期光合特性及产量的影响,在田间试验条件下,以延薯四号作为供试材料,设置4个施氮水平CK(不施氮)、N1(低氮)、N2(中氮)、N3(高氮),在马铃薯全生育期进行了叶面积指数、功能叶片的净光合速率、胞间CO_2浓度、气孔导度及SPAD等相关指标的测定。研究结果表明,本试验条件下,合理施氮有助于提高马铃薯叶片的光合性能。在一定范围内,随着施氮量的增加,叶面积指数、SPAD值、生物产量显著增加;全生育期马铃薯SPAD值与产量呈极显著正相关;马铃薯生育前期,叶面积指数与产量呈极显著正相关;块茎膨大后期,光合速率与产量呈极显著正相关。本试验条件下,施氮量为N2(纯氮150 kg/hm2)时经济产量最高。
The effects of nitrogen application rate on photosynthetic characteristic and yield during the whole growth period of potato were studied under field experiments by using ＂Yanshu4＂ variety as the tested material. Four experiments were conducted with different N application rates： CK （no nitrogen）, N1 （low nitrogen）, N2 （medium nitrogen）, and N3 （high nitrogen）, and the leaf area index, net photosynthesis rate （Pn）, intercellular CO2 concentration （Ci）, stomatal conductance （Gs） and SPAD in potato leaves were measured in the whole growth period. The results showd that reasonable nitrogen application could improve photosynthetic performance of potato leaves under the conditions of this experiment. Leaf area index, SPAD and biological yield increased with the increase of nitrogen application rate in a certain range. During the whole growth period, SPAD value of potato was significantly positively correlated with yield. There was a significantly positive correlation between yield and leaf area index at the early stage of growth. At the late stage of tuber expansion, there was a significantly positive correlation between yield and Pn. Under the condition of this experiment, the highest economic yield occurred when the nitrogen application rate was N2 （pure nitrogen 150 kg/hm^2）.
出处
《基因组学与应用生物学》
CAS
CSCD
北大核心
2017年第1期324-330,共7页
Genomics and Applied Biology
基金
现代农业产业技术体系建设专项资金(CARS-10)资助
关键词
马铃薯
施氮量
光合特性
SPAD值
产量
Potato, Nitrogen application rate, Photosynthetic characteristics, SPAD, Yield
