盐碱混合胁迫对‘中山杉406’生长及光合特性的影响
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摘要
【目的】研究不同浓度的盐碱混合胁迫对‘中山杉406’(Taxodium hybrid‘Zhongshanshan 406’)生长及光合特性的影响。【方法】采取室内土培法模拟沿海地区盐渍土的离子组分对‘中山杉406’进行盐碱混合胁迫,研究其株高、地径、鲜质量和干质量等生物量及光合色素、净光合速率(P_n)、蒸腾速率(T_r)、气孔导度(G_s)、胞间CO_2浓度(C_i)和光响应曲线等光合特性的响应。【结果】盐碱混合胁迫45 d后,供试的‘中山杉406’全部存活,3、5和8 g/kg盐碱处理组的中山杉株高、地径及根冠比均与CK无显著差异,但8 g/kg处理组的根和叶的生物量比CK组显著降低。盐碱混合胁迫对叶片光合色素含量没有显著影响,但显著降低了叶片P_n、T_r和G_s,而气孔限制值(L_s)、瞬时水分利用率(η_(WUE))和C_i无显著变化。盐碱混合胁迫下,光合-光强响应曲线表现出明显的光饱和限制,光补偿点(p_(LCP))维持在较低水平,5和8 g/kg处理组的光饱和点(p_(LSP))显著降低。‘中山杉406’在低于8g/kg的盐碱混合胁迫下均可成活,高于5 g/kg的盐碱混合胁迫显著降低了叶片净光合速率,非气孔限制因素是造成P_n下降的主要原因。【结论】盐碱混合胁迫下,‘中山杉406’可通过提高全日照弱光的利用率和维持水分利用率(WUE)来缓解盐碱混合胁迫对其光合作用的影响。可见,‘中山杉406’对盐碱混合胁迫有较强的适应能力,是适用于盐碱地治理和绿化的优良乔木。
【Objective】This study was conducted to investigate the effects of different levels of salt and alkalinity in the soil on the growth and photosynthetic characteristics of the hybrid cultivar Taxodium hybrid‘Zhongshanshan 406’.【Method】The soil culture method was adopted to simulate salt-alkaline mixed stress on T.‘Zhongshanshan 406’,replicating the characteristic qualities of coastal soils.The following parameters were measured:plant height,ground diameter,fresh weight,dry weight,chloroplast pigment,net photosynthetic rate,stomatal conductance,intercellular CO_2concentration,and light response curve.【Result】All T.‘Zhongshanshan 406’individuals survived after 45 days of salt-alkaline mixed stress,and the plant height,ground diameter,and root shoot ratio of 3,5 and 8 g/kg treatments exhibited no significant changes,compared with the control,but the biomass of roots and leaves in the 8 g/kg treatment was significantly lower than that of the control.Salt-alkaline mixed stress also had no significant effects on leaf photosynthetic pigments,stomatal limitations,and intercellular CO_2concentration.However,the net photosynthetic rate,transpiration rate,and stomatal conductance decreased in salt-alkaline mixed stress.The light compensation point was maintained at a lower level due to salt-alkaline mixed stress.The light saturation point of the 5 and 8 g/kg treatment groups decreased significantly,and the photosynthetic light intensity response curve showed obvious light saturation limits under salt-alkaline mixed stress.【Conclusion】The T.‘Zhongshanshan 406’survived under a salt-alkaline mixed stress of less than 8g/kg.The leaf net photosynthetic rate was significantly reduced by a saline-alkali mixture stress that was higher than
【Objective】This study was conducted to investigate the effects of different levels of salt and alkalinity in the soil on the growth and photosynthetic characteristics of the hybrid cultivar Taxodium hybrid‘Zhongshanshan 406’.【Method】The soil culture method was adopted to simulate salt-alkaline mixed stress on T.‘Zhongshanshan 406’,replicating the characteristic qualities of coastal soils.The following parameters were measured:plant height,ground diameter,fresh weight,dry weight,chloroplast pigment,net photosynthetic rate,stomatal conductance,intercellular CO_2concentration,and light response curve.【Result】All T.‘Zhongshanshan 406’individuals survived after 45 days of salt-alkaline mixed stress,and the plant height,ground diameter,and root shoot ratio of 3,5 and 8 g/kg treatments exhibited no significant changes,compared with the control,but the biomass of roots and leaves in the 8 g/kg treatment was significantly lower than that of the control.Salt-alkaline mixed stress also had no significant effects on leaf photosynthetic pigments,stomatal limitations,and intercellular CO_2concentration.However,the net photosynthetic rate,transpiration rate,and stomatal conductance decreased in salt-alkaline mixed stress.The light compensation point was maintained at a lower level due to salt-alkaline mixed stress.The light saturation point of the 5 and 8 g/kg treatment groups decreased significantly,and the photosynthetic light intensity response curve showed obvious light saturation limits under salt-alkaline mixed stress.【Conclusion】The T.‘Zhongshanshan 406’survived under a salt-alkaline mixed stress of less than 8g/kg.The leaf net photosynthetic rate was significantly reduced by a saline-alkali mixture stress that was higher than
引文
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[2]LIU Y. Introduction to land use and rural sustainability in China[J]. Land Use Policy,2018,74:1-4. DOI:10.1016/j.landusepol.2018.01.032.
[3]NOURI H,BORUJENI S C,NIROLA R,et al. Application of green remediation on soil salinity treatment:a review on halophytoremediation[J]. Process Safety and Environmental Protection,2017,107:94-107. DOI:10.1016/j.psep.2017.01.021.
[4]尹蓉,张倩茹,江佰阳,等.盐碱地经济林栽培研究及展望[J].林业实用技术,2017(10):66-69. DOI:10.13456/j.cnki.lykt.2017.10.022.YIN R,ZHANG Q R,JIANG B Y,et al. Research and prospect on cultivation of economic forest in saline-alkali land[J]. Forest Science and Technology,2017(10):66-69.
[5]华建峰,杜丽娟,王莦丰,等.混合盐胁迫对江苏省沿海常用绿化树种生长的影响及耐盐性评价[J].植物资源与环境学报,2015,24(3):41-49. DOI:10.3969/j. issn.1674-7895.2015.03.06.HUA J F,DU L J,WANG X F,et al. Effect of mixed salt stress on growth of common greening species in coastal area of Jiangsu Province and evaluation of their salt tolerance[J]. Journal of Plant Resources and Environment,2015,24(3):41-49.
[6]於朝广,殷云龙,莫海波,等.江苏洋口港临港工业区耐盐绿化树木引种试验[J].林业工程学报,2011,25(3):32-35.DOI:10.3969/j.issn.1000-8101.2011.03.008.YU C G,YIN Y L,MO H B,et al. A experiment on the introduction of salt-tolerant tree species in Yangkou Harbor industrial area of Jiangsu[J]. China Forestry Science and Technology,2011,25(3):32-35.
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[8]YANG J Y,ZHENG W,TIAN Y,et al. Effects of various mixed salt-alkaline stresses on growth, photosynthesis, and photosynthetic pigment concentrations of Medicago ruthenica,seedlings[J]. Photosynthetica,2011,49(2):275-284. DOI:10.1007/s11099-011-0037-8.
[9]CHARTZOULAKIS K S. Salinity and olive:growth, salt tolerance,photosynthesis and yield[J]. Agricultural Water Management,2005,78(1/2):108-121. DOI:10. 1016/j. agwat.2005.04.025.
[10] KHAN H A,SIDDIQUE K H M,MUNIR R,et al. Salt sensitivity in chickpea:growth,photosynthesis,seed yield components and tissue ion regulation in contrasting genotypes[J].Journal of Plant Physiology,2015,182:1-12. DOI:10.1016/j.jplph.2015.05.002
[11]唐玲,李倩中,荣立苹,等.盐胁迫对鸡爪槭幼苗生长及其叶绿素荧光参数的影响[J].西北植物学报,2015,35(10):2050-2055. DOI:10.7606/j.issn.1000-4025.2015.10.2050.TANG L,LI Q Z,RONG L P,et al. Effects of salt stress on the growth and leaf chlorophyll fluorescence in acer palmatum seedlings[J]. Acta Botanica Boreali-Occidentalia Sinica,2015,35(10):2050-2055.
[12]黄依婷,郭鹏,许涵杰.盐胁迫对紫花苜蓿根系形态特征和水分利用效率的影响[J].黑龙江农业科学,2016(4):114-120. DOI:10.11942/j.issn1002-2767.2016.04.011.HUANG Y T,GUO P,XU H J. Effect of salt stress on root morphological characteristics and leaf water use efficiency in Alfalfa[J]. Heilongjiang Agricultural Sciences,2016(4):114-120.
[13]贾文.不同供钾水平下罗布麻对盐胁迫的生理响应[D].兰州:兰州大学,2015.JIA W. Physiological responses of Apocynum venetum to salt stress under different potassium supplying levels[D]. Lanzhou:Lanzhou University,2015.
[14]许丽霞,江洪,张敏霞,等.安吉毛竹林生态系统光合作用特征及其环境影响因子研究[J].江西农业大学学报,2017(5):928-937. DOI:10.13836/j.jjau.2017120.XU L X,JIANG H,ZHANG M X,et al. Net photosynthesis and its affecting factors of bamboo forest in Anji County.[J]. Journal of Jiangxi Agricultural University,2017(5):928-937.
[15]LIN J X,LI Z L,SHUAI S,et al. Effects of various mixed saltalkaline stress conditions on seed germination and early seedling growth of Leymus chinensis from Songnen Grassland of China[J].Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 2014, 42(1):154-159. DOI:10.15835/nbha4219388.
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