施氮量对油用牡丹‘凤丹’光合特性及产量的影响  

Effects of nitrogen application on photosynthetic characteristics and yields of oil tree peony Paeonia ostii ‘Feng Dan'

作　　者：段祥光 张利霞[1] 刘伟[1] 郭丽丽[1] 郭大龙[2] 侯小改[1] 

机构地区：[1]河南科技大学农学院,河南洛阳471023 [2]河南科技大学林学院,河南洛阳471023

出　　处：《南京林业大学学报（自然科学版）》2018年第1期48-54,共7页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：河南省科技创新杰出人才计划(164200510013);国家自然科学基金项目(31370697)

摘　　要：【目的】研究不同氮肥施用水平对油用牡丹‘凤丹’(Paeonia ostii‘Feng Dan’)光合特性及籽粒产量的影响,确定合理的氮肥施用方案,为其科学配方施肥提供理论依据。【方法】在自然栽培条件下,试验设置对照组(N_0)和150(N_1)、225(N_2)、300(N_3)、375(N_4)、450(N_5)、525(N_6)、600 kg/hm^2(N7)7个氮素水平,探讨油用牡丹‘凤丹’盛花期光合特性及籽粒产量关键参数对不同氮肥施用水平的响应特征。【结果】与对照组相比,不同氮处理的牡丹光合特性和籽粒产量关键参数均有明显提高,且各处理间差异显著(P<0.05)。施用氮肥在N5水平时,‘凤丹’叶片净光合速率、气孔导度、蒸腾速率均达到最大值,较对照分别提高了37.47%、70.06%和32.83%;而胞间CO_2浓度则降低至最小值,较对照降低了11.43%。千粒质量(318.58 g)和单株籽粒产量(41.58 g)均达到最大值,且显著高于其他氮处理(P<0.05),较对照分别提高了26.17%和282.16%。【结论】氮肥在N5水平(450 kg/hm^2)时,‘凤丹’光合特性及籽粒产量有大幅提高,450 kg/hm^2尿素为合理的氮肥施用量。【Objective】This study on the effects of different nitrogen application rates on the photosynthetic characteristics and yields of oil tree peony（Paeonia ostii‘Feng Dan＇） was conducted to determine the reasonable nitrogen fertilizer application,which could provide atheoretical basis for high-yield cultivation.【Method】The control（N0） and seven nitrogen fertilizer rates,including 150（N1）,225（N2）,300（N3）,375（N4）,450（N5）,525（N6）,and 600（N7） kg/hm^2,were used,and the responses of the parameters of photosynthesis and the yield of ‘Feng Dan＇at the flowering stage relative to different nitrogen application rates were analyzed.【Result】Compared with the control,the parameters of photosynthesis and grain yield were significantly improved under each nitrogen treatment,and the difference among N application rates was significant（P 0.05）.The net photosynthetic rate,stomatal conductance,and transpiration rate of the leaves increased to their highest levels at the level of N5,which resulted in increases of 37.47%,70.06% and 32.83%,respectively; and the intercellular CO2 concentration decreased by 11.43%,relative to that of the control.In addition,1000-grain weight（318.58 g） and seed yield per plant（41.58 g） were significantly higher than those in other nitrogen treatments（P 0.05）,and increased by 26.17% and 282.16% compared with that of the control,respectively.【Conclusion】The photosynthetic characteristics and yields of Paeonia ostii ‘Feng Dan＇were significantly improved at the level of N5（450 kg/hm^2） in this study,which could be recommended as a reasonable nitrogen application rate.

关 键 词：油用牡丹 氮肥施用 光合特性 籽粒产量 

分 类 号：S718[农业科学—林学] S567.15