[1]谭长强,申文辉,欧芷阳,等. 镉胁迫及施氮措施对喀斯特特有树种蚬木光合生理的影响[J].西北林学院学报,2018,33(1):26-30.[doi:10.3969/j.issn.1001-7461.2018.01.04]
　TAN Zhang-qiang,SHEN Wen-hui,OU Zhi-yang,et al. Effects of Nitrogen Application on the Photosynthetic Physiology of Excentrodendron hsienmu in Karst Area under Cd Stress[J].JOURNAL OF NORTHWEST FORESTRY UNIVERSITY,2018,33(1):26-30.[doi:10.3969/j.issn.1001-7461.2018.01.04]
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 镉胁迫及施氮措施对喀斯特特有树种蚬木光合生理的影响()
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《西北林学院学报》[ISSN:1001-7461/CN:61-1202/S]

卷:
第33卷
期数:
2018年第1期
页码:
26-30
栏目:
出版日期:
2018-01-31

文章信息/Info

Title:
 Effects of Nitrogen Application on the Photosynthetic Physiology of Excentrodendron hsienmu in Karst Area under Cd Stress
文章编号:
1001-7461(2018)01-0026-05
作者:
 谭长强1; 2; 3; 申文辉1; 2; 3; 欧芷阳1; 2; 3; 彭玉华1; 2; 3*; 曹艳云1; 2; 3; 郝海坤1; 2; 3
 （1.广西林业科学研究院，广西 南宁 530002；2.广西优良用材林资源培育重点实验室，广西 南宁 530002；3.国家林业局 中南速生材繁育实验室，广西 南宁 530002）
Author(s):
 TAN Zhang-qiang1; 2; 3; SHEN Wen-hui1; 2; 3; OU Zhi-yang1; 2; 3; PENG Yu-hua1; 2; 3*; CAO Yan-yun1; 2; 3; HAO Hai-kun1; 2; 3
 (1.Guangxi Academy of Forestry,Nanning,Guangxi 530002,China; 2.Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation,Nanning,Guangxi 530002,China; 3.Key Laboratory of Central South Fast-growing Timber Cultivation,Nanning,Guangxi 530002,China)
关键词:
 ; 蚬木; 镉胁迫; 氮肥; 光合作用; 生理特征
Keywords:
Excentrodendron hsienmu;  cadmium stress;  nitrogen fertilizer;  photosynthesis;  physiological characteristics
分类号:
S792.99
DOI:
10.3969/j.issn.1001-7461.2018.01.04
文献标志码:
A
摘要:
 采用盆栽方法，研究镉胁迫及施氮措施对喀斯特特有树种蚬木（Excentrodendron hsienmu）光合生理特性的影响，为镉污染的治理及修复措施提供科学依据。结果表明，镉胁迫显著抑制了蚬木苗高、地径、净光合速率(Pn)、蒸腾速率（Tr）和叶绿素含量，显著提高了蚬木胞间二氧化碳浓度（Ci），高镉（120 mg·kg-1·Cd2+）胁迫时，分别比CK降低或升高了36.6%、66.4%、34.3%、20.9%、4.1%、12.1%；气孔导度则无明显变化。低镉（30 mg·kg-1·Cd2+）胁迫下施氮，蚬木苗高、地径、叶绿素含量、Pn及Tr随着施氮浓度的增加表现为先微弱上升后下降，而Ci正好相反表现为先降后增，Gs则表现为不断降低；高氮（0.8 g·kg-1）下，均比不施氮处理分别下降了9.7%、17.9%、23.9%、36.0%、13.5%、43.1%和5.6%。高镉胁迫下施氮，蚬木苗高、地径、叶绿素含量、Pn、Gs和Tr均随着施氮量的增加而不断降低，并且高氮均比不施氮显著降低了29.1%、23.4%、19.3%、40.3%、41.7%和17.9%；Ci则显著地提升5.5%。说明镉胁迫下影响蚬木光合作用的主要因素为非气孔因素。低镉胁迫下施低氮对蚬木镉胁迫环境的适应性有一定的提升作用，高镉下施氮以及低镉下施高氮均使氮协同镉对蚬木产生了胁迫作用。
Abstract:
 This paper studied the effects of nitrogen application on the growth and physiological characteristics of Excentrodendron hsienmu under Cd stress,an endemic plant species occurring in Karst area to provide scientific basis for the management of cadmium pollution and remediation measures.The results indicated that under the stress of high Cd concentration (120 mg·kg-1),seedling height (H),ground diameter (D) ,transpiration rate (Tr),net photosynthetic rate (Pn),and chlorophyll content decreased by 36.6%,66.4%,34.3%,20.9%,and 4.1%,respectively,while intercellular CO2 concentration (Ci) increased by 12.1%,and no significant changes in the stomatal conductance (Gs).Under low Cd concentration stress (30 mg·kg-1·Cd2+) and the application of nitrogen,H,D,chlorophyll content,Pn and Tr increased slightly,and then decreased with the increase of applying nitrogen,while Ci decreased first,and then increased,and Gs decreased constantly.Under high level of applying nitrogen (0.9 g·kg-1),H,D,chlorophyll content,Pn,Tr,Ci,and Gs decreased by 9.7%,17.9%,23.9%,36.0%,13.5%,43.1% and 5.6%,respectively,compared with those without nitrogen application.Under high Cd concentration,H,D,chlorophyll content,Pn,Gs and Tr decreased with the increase of nitrogen application and compared with those without nitrogen application,the parameters mentioned above decreased by 29.1%,23.4%,19.3%,40.3%,41.7%,and 17.9%,respectively,while Ci increased by 5.5%,indicating thatr non-stomatal limitation was the key factor that affected the photosynthesis of E.hsienmu under cadmium stress.The adaptation of E.hsienmu was promoted under low cadmium stress by adding low level nitrogen.E.hsienmu was intimidated under low cadmium stress by adding high nitrogen or under high cadmium stress by adding nitrogen.

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备注/Memo

备注/Memo:
 收稿日期：2017-07-17修回日期：2017-10-31
基金项目：广西优良用材林资源培育重点实验室自主课题（15-A-02-02）；广西林业科技项目（桂林科字［2014］02号）；广西自然科学基金（2014GXNSFAA118132）；广西科技计划项目（桂科AB16380300） ；广西优良用材林资源培育重点实验室开放课题（14B0101）。
作者简介：谭长强，男，工程师，硕士，研究方向：森林培育和森林生态。E-mail：315990730@qq.com
*通信作者：彭玉华，女，高级工程师，研究方向:森林培育与生态林业工程。E-mail:pyh112233456789@126.com
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