[1]任宇航a,胥晓a,b,等.模拟氮沉降和铅胁迫对珙桐幼苗生长的影响[J].西华师范大学学报(自然科学版),2019,40(02):112-118.[doi:10.16246/j.issn.1673-5072.2019.02.002]
 REN Yuhanga,XU Xiaoa,b,et al.Effects of Simulated Nitrogen Deposition and Lead Stress on the Growth of Davidia involucrate Seedlings[J].Journal of China West Normal University(Natural Sciences),2019,40(02):112-118.[doi:10.16246/j.issn.1673-5072.2019.02.002]
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模拟氮沉降和铅胁迫对珙桐幼苗生长的影响

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《西华师范大学学报(自然科学版)》[ISSN:1673-5072/CN:51-1699/N]

卷:
40
期数:
2019年02期
页码:
112-118
栏目:
出版日期:
2019-06-20

文章信息/Info

Title:

Effects of Simulated Nitrogen Deposition and Lead Stress on the Growth of Davidia involucrate Seedlings

作者:

任宇航a胥晓ab刘沁松ab徐文娟ab

(西华师范大学 a.生命科学学院, b.西南野生动植物资源保护教育部重点实验室, 四川 南充637009)

Author(s):

REN YuhangaXU XiaoabLIU QinsongabXU Wenjuanab

(1.a.College of Life Sciences,b.Key Laboratory of Southwest China Wildlife Resources Conservation of the Ministry of Education,West China Normal University,Nanchong Sichuan 637009,China)

关键词:

珙桐植物生长光合作用

Keywords:

Davidia involucrategrowthphotosynthesisnitrogenlead

分类号:
Q945
DOI:
10.16246/j.issn.1673-5072.2019.02.002
文献标志码:
A
摘要:

本文以NH4NO3和Pb(CH3COO)2分别作为N和Pb2+的来源,研究了2种氮素水平(0、15 g N·m-2·a-1)和3种Pb2+处理(0、500和1 000 mg·kg-1)下珙桐Davidia involucrata幼苗的光合作用和生长变化,以此模拟氮沉降和铅胁迫对珙桐幼苗生长的影响。结果发现:高浓度的铅胁迫对幼苗的光合作用与生长起到了显著的抑制作用,降低了幼苗的气体交换特征、叶绿素含量及生物量干重指标;而中浓度的铅胁迫虽然一定程度抑制了幼苗的光合作用,降低了总叶绿素含量,但增加了植株总叶面积,最终导致叶和根生物量增加。另一方面,模拟氮沉降可以一定程度减轻铅胁迫对幼苗造成的伤害,并显著增加叶绿素含量及叶生物量,降低根生物量,导致生物量向地上部分分配。上述研究结果表明,高浓度的铅胁迫显著抑制了珙桐幼苗的光合作用和生长,而模拟氮沉降可以一定程度地缓解铅胁迫对珙桐幼苗生长的影响。

Abstract:

To explore the effects of simulated nitrogen deposition and lead stress on the growth of Davidia involucrata seedlings,NH4NO3 and Pb(CH3COO)2 are used as the source of N and Pb2+,respectively.Then,the response of photosynthesis and growth of D.involucrata seedlings to two N levels (0 and 15 g N·m-2·a-1) and three Pb2+ treatments (0,500 and 1 00 mg·kg-1) are investigated.The results show that the photosynthesis and growth of D.involucrate seedlings are significantly affected by the high concentration of Pb2+ under which the gas exchange characteristics,chlorophyll content and dry biomass accumulation have decreased significantly.Although under the moderate concentration of Pb2+,the photosynthesis rate and total chlorophyll content have decreased significantly,the total leaf area and biomass of leaf and root have increased.On the other hand,simulated N deposition could alleviate the stresses caused by lead to some extent.Moreover,simulated N deposition has significantly increased the leaf chlorophyll content,leaf biomass and the allocation of aboveground biomass.In conclusion,these results demonstrate that high concentration of Pb2+ significantly inhibits the photosynthesis and growth of D.involucrate seedlings whereas the simulated nitrogen deposition could relieve these stresses to a certain degree.

备注/Memo

备注/Memo:

收稿日期:2018-12-07
基金项目:四川省教育厅创新团队项目(14TD0015);西华师范大学英才基金(17YC351)
作者简介:任宇航(1992—),男,四川南充人,硕士研究生,主要从事植物生理生态研究。E-mail:1939212427@qq.com
通信作者:徐文娟(1982—),女,甘肃天水人,博士,讲师,主要从事植物生理生态研究,E-mail:xuwj2006@163.com

更新日期/Last Update: 2019-06-25