植物生态学报 ›› 2018, Vol. 42 ›› Issue (2): 229-239.doi: 10.17521/cjpe.2017.0218

• 研究论文 • 上一篇    下一篇

淹水和干旱生境下铅对芦苇生长、生物量分配和光合作用的影响

张娜1,2,3,朱阳春1,李志强5,卢信1,范如芹1,刘丽珠1,童非1,陈静3,穆春生4,*(),张振华1,*>()   

  1. 1江苏省农业科学院农业资源与环境研究所, 南京 210014
    2江苏省农业科学院江苏省食品质量安全重点实验室, 南京 210014
    3淮阴工学院江苏省凹土资源利用重点实验室, 江苏淮安 223003
    4东北师范大学草地科学研究所植被生态教育部重点实验室, 长春 130024
    5南京信息工程大学公共管理学院/气候变化与公共政策研究院, 南京 210044
  • 出版日期:2018-02-20 发布日期:2018-04-16
  • 通讯作者: 穆春生,张振华 E-mail: Zhang ZH, zhenhuaz70@hotmail.com; Mu CS,mucs821@nenu.edu.cn
  • 基金资助:
    中国博士后科学基金(2017M621670);国家重点基础研究发展计划973计划(2017M621670);江苏省农业科技自主创新资金(CX(16)1051)

Effect of Pb pollution on the growth, biomass allocation and photosynthesis of Phragmites australis in flood and drought environment

ZHANG Na1,2,3,ZHU Yang-Chun1,LI Zhi-Qiang5,LU Xin1,FAN Ru-Qin1,LIU Li-Zhu1,TONG Fei1,CHEN Jing3,MU Chun-Sheng4,*(),ZHANG Zhen-Hua1,*()   

  1. 1Institute of Agricultural Resource and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China

    2Key Laboratory of Food Quality and Safety of Jiangsu Province, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China

    3Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province, Huaiyin Institute of Technology, Huai’an, Jiangsu 223003, China;

    4Key Laboratory of Vegetation Ecology, Ministry of Education, Institute of Grassland Science, Northeast Normal University, Changchun 130024, China

    5Institution of Climate Change and Public Polices, School of Public Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China
  • Online:2018-02-20 Published:2018-04-16
  • Contact: Chun-Sheng MU,Zhen-Hua ZHANG E-mail: Zhang ZH, zhenhuaz70@hotmail.com; Mu CS,mucs821@nenu.edu.cn
  • Supported by:
    Supported by the China Postdoctoral Science Foundation.(2017M621670);the National Basic Research Program of China.(2017M621670);the Agricultural Science and Technology Independent Innovation Fund of Jiangsu Province.(CX(16)1051)

摘要:

芦苇(Phragmites australis)作为典型的根茎型多年生湿地植物, 具有广泛的环境耐受性。该研究采用盆栽实验, 采取裂区实验设计, 水分处理为主区, 包括淹水和干旱两个水平, 铅(Pb)为副区, 包括0、500、1500、3β000、4β500 mg·kg-1 5个水平, 共10个处理, 每个处理12个重复, 研究淹水和干旱条件下Pb污染对芦苇生长、生物量分配及光合作用的影响, 以期明确不同生境下芦苇适应或忍耐重金属污染而采取的策略, 为芦苇应用于湿地恢复和污染修复提供理论依据。结果表明, 在淹水处理中, Pb显著抑制地下芽形成和根茎生长, 但对子株数没有影响; 与母株相比子株具有高的日生长速率、光合速率和生物量(母株的3-7倍)。在干旱环境中, Pb显著抑制根、地下芽和根茎生长, 母株和子株生物量积累及光合作用, 且这些指标均小于淹水处理的。无论在淹水还是干旱环境中, 芦苇体内绝大部分Pb积累在根中, 根茎和子株中Pb含量较少, 被转运至母株中的Pb大约是子株的3倍。淹水条件下子株体内Pb含量小于干旱处理的。结果表明, 干旱和Pb的协同作用显著抑制芦苇生长、生物量积累和光合作用, 可能导致子株生产力和种群密度减小甚至种群衰退。但淹水芦苇能够采取相应的Pb分配策略减缓Pb污染对芦苇生长、生理和繁殖的负面影响, 有利于芦苇种群的繁衍和稳定。

关键词: 铅污染, 水分, 生长, 生物量分配, 光合作用

Abstract:
Aims Reed (Phragmites australis) is a typical perennial rhizomatic plant with extensive tolerance to environmental stress. In order to better understand the adaptation and tolerance of reeds subjected to heavy metal pollution in different levels of water, we conducted a study on the effects of Pb pollution on growth, biomass and photosynthesis of reeds in flood and drought environment. This research would provide theoretical basis for application of reeds in wetland restoration and remediation. Methods We conducted a pot experiment with destructive sampling after 90 days of growth. The water treatments were main plot, including two water levels. The Pb treatments were secondary plot (nested within water treatments), including five levels (0, 500, 1 500, 3 000, 4 500 mg·kg-1). There were 10 treatments with 12 replicates per treatment. Important findings In the flood environment, Pb pollution significantly inhibited the growth of buds and rhizomes, but had no significant effect on the number of offspring shoots. The offspring shoots had higher growth rate per day, net photosynthetic rate and biomass compared to the parent shoots. In the drought environment, Pb pollution inhibited the growth of roots, buds and rhizomes, and biomass accumulation of parent and offspring shoots as well as photosynthetic parameters. These parameters were lower under the drought condition than in the flood environment. The Pb was mostly concentrated in roots compared to rhizomes and offspring shoots. In both flood and drought environments, the concentration of Pb in parent shoots was about three times of that in offspring shoots. The Pb concentration in offspring shoots under the flood condition was less than that in the drought environment. Overall, these results indicated that the synergistic effect of Pb and drought significantly inhibited the growth, biomass accumulation and photosynthesis of reeds, which might result in reduced offspring productivity and population density and may lead to population decline. However, the flooded reeds could adopt some strategies of Pb allocation to alleviate the negative effect of Pb on the growth, physiology and clonal propagation, benefiting the population reproduction and stabilization.

Key words: Pb pollution, water, growth, biomass allocation, photosynthesis