摘要
为探讨不同氮素水平对日光温室基质栽培西瓜生长及生理的效应,以发酵好的枸杞枝条粉基质为栽培介质,采用随机区组设计,研究氮素水平对枸杞枝条基质栽培西瓜生长发育的影响。结果表明,随着氮素水平的增加,西瓜叶片叶绿素含量、光合速率(Pn)、蒸腾速率(Tr)、原初光能转化效率(Fv/Fm)、反应中心潜在活性(Fv/Fo)、反应中心吸收的光能(ABS/RC)、捕获的能量(ETo/CSo)和性能指数(PI)都呈显著先增加后降低的趋势;热耗散(DIo/CSo)呈显著先下降后上升的趋势;胞间CO2浓度(Ci)无显著变化。表明不施氮素和氮素过多都对叶绿素含量、光合特性和光合机构造成胁迫,导致气孔关闭,PSⅡ活性中心受到损伤,能量转化分配失衡,电子传递受阻。以氮素水平为225和375 kg·hm(^-2)能够促进日光温室枸杞枝条基质栽培西瓜生长和光合生理活动达到较佳水平,可作为宁夏日光温室枸杞枝条基质栽培西瓜氮素指标决策的依据。
To explore the effect of different nitrogen levels on the growth and physiological effects of solar greenhouse substrate,randomized block design was used to study the effects of nitrogen levels on the growth and development of watermelon cultivated with fermented Chinese wolfberry powder matrix as the medium of cultivation.The results showed that,with the increase of nitrogen level,the content of chlorophyll,net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance(Gs),initial photoenergy conversion efficiency(Fv/Fm),potential activity of reaction center(Fv/Fo),light energy absorbed by reaction center(ABS/RC),energy captured(ETo/CSo)and performance index(PI)were all decreased.Thermal dissipation(DIo/CSo)showed a significant first decline and then an upward trend.Intercellular CO 2 concentration(Ci)showed no significant change.The results showed thatwith the increase of nitrogen level the chlorophyll content in the watermelon leaf,net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance(Gs),the initial photoenergy conversion efficiency(Fv/Fm),potential active reaction center(Fv/Fo),the reactive center of absorbed light(ABS/RC),the energy captured(ETo/CSo)and the performance index(PI)all showed a significant tendency of rising first and then declining.Thermal dissipation(DIo/CSo)showed a significant declining first and then an upward trend.Intercellular CO 2 concentration(Ci)showed no significant change.,indicating that no application and the excessive application of nitrogen could both cause stress of chlorophyll,photosynthetic characteristics and photosynthetic mechanism,thus leading to stomatal closure,PSⅡlesions in the active center,energy conversion imbalance,and electron transfer suffocation.The nitrogen level of 225 and 375 kg·hm-2 could promote the growth and photosynthetic physiological activities of watermelon cultivated with the medlar branches matrix in the solar greenhouse to achieve a better level,and could be used as the basis for the nitrogen index decision-making for watermelon solar greenhouse cultivation with the wolfberry branchessubstrate in Ningxia.
作者
冯海萍
李玉霞
杨冬艳
谢华
裴红霞
FENG Haiping;LI Yuxia;YANG Dongyan;XIE Hua;PEI Hongxia(Institute of Germplasm Resources,Ningxia Academy of Agriculture and Forestry Science,Yinchuan 750002,China;Yinchuan University of Energy,Yongning 750100,China)
出处
《河南农业大学学报》
CAS
CSCD
北大核心
2018年第4期554-559,565,共7页
Journal of Henan Agricultural University
基金
宁夏农林科学院科技创新先导资金项目(NKYQ-16-05)
国家自然科学基金项目(31501803)
关键词
枸杞枝条基质
氮素水平
西瓜
光合作用
叶绿素荧光
产量
wolfberry branch substrate
nitrogen level
watermelon
photosynthesis
chlorophyll fluorescence
production
