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[1]赵小祥 王根绪 杨凯 杨阳 冉飞 段宝利 类延宝 杨燕**.西南亚高山冬瓜杨和峨眉冷杉吸收根特征*[J].应用与环境生物学报,2019,25(05):1-11.[doi:10.19675/j.cnki.1006-687x.2019.01015]
 ZHAO Xiao-xiang,WANG Gen-xu,et al.Characteristics of absorptive roots of subalpine Populus purdomii and Abies fabri in Southwest China *[J].Chinese Journal of Applied & Environmental Biology,2019,25(05):1-11.[doi:10.19675/j.cnki.1006-687x.2019.01015]
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西南亚高山冬瓜杨和峨眉冷杉吸收根特征*()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
25卷
期数:
2019年05期
页码:
1-11
栏目:
研究论文
出版日期:
2019-08-25

文章信息/Info

Title:
Characteristics of absorptive roots of subalpine Populus purdomii and Abies fabri in Southwest China *
作者:
赵小祥12 王根绪1 杨凯12 杨阳1 冉飞1 段宝利1 类延宝1 杨燕1**
1中国科学院成都山地灾害与环境研究所 成都 610041 2 中国科学院大学 北京 100049
Author(s):
ZHAO Xiao-xiang1 2 WANG Gen-xu1 YANG Kai1 2 YANG Yang1 RAN Fei1 Duan Bao-li1 Lei Yan-bao1 & YANG Yan 1**
1Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
2University of Chinese Academy of Sciences, Beijing 100049, China
关键词:
吸收根形态特征阔叶落叶树针叶树土壤养分
Keywords:
absorptive root morphological traits broad-leaved deciduous tree conifer tree soil nutrients
DOI:
10.19675/j.cnki.1006-687x.2019.01015
摘要:
植物的吸收根是植物从土壤中获取资源的重要器官,其快速周转在生态系统碳循环和养分循环中充当着重要作用,而且其形态特征也反映了植物根系对地下资源利用策略的异同。以海螺沟冰川末端原生演替后期非顶极落叶阔叶林优势物种冬瓜杨(Populus purdomii)和顶极的暗针叶林群落优势物种峨眉冷杉(Abies fabri)作为研究对象,采用土钻法获取两种优势物种的吸收根,分别测定了两个优势树种的吸收根形态特征及对应的林下土壤养分含量、温度和湿度。结果表明:(1)两个森林群落林下的土壤温湿度差异不显著,但峨眉冷杉群落土壤总氮、有效氮、有效磷、铵态氮及硝态氮显著高于冬瓜杨群落;(2)峨眉冷杉的总根长、根长密度、比根长和比表面积显著低于冬瓜杨,平均根直径、总根体积和生物量密度显著高于冬瓜杨;(3)冗余分析表明,冬瓜杨和峨眉冷杉的部分吸收根形态特征和土壤养分存在着正相关性,其中冬瓜杨林下土壤有效氮、总磷分别和冬瓜杨根长密度、根比表面积呈显著正相关,峨眉冷杉林下土壤有效氮和峨眉冷杉吸收根平均直径呈显著正相关。本研究结果说明土壤中氮和有效磷养分显著的不同可能是造成冬瓜杨和峨眉冷杉吸收根形态特征差异的重要因素。
Abstract:
The absorptive root is an important part of the plants to extract nutrients from the soil. Rapid turnover of absorptive root functions in the carbon and nutrients cycles as reflection of morphological characteristics. Such characters results in similarities and differences of plant roots by utilization of underground resources. In this study, Populus purdomii (dominant species of broad-leaved forest as non-climax community) and Abies fabri (dominant species of coniferous forest as climax community) in the retreat terrain of the Hailuogou Glacier are selected as target species for root samples. All the roots were sampled using soil auger in the field. Morphological characteristics of absorptive roots from both species, soil temperature, soil moisture and soil nutrients under both succession stages were all measured. The results showed that: (1) there were no significant differences in soil temperature and moisture between two types of forest soil, but soil total nitrogen, available nitrogen, available phosphorus, ammonium nitrogen and nitrate nitrogen at A. fabri communitywere significantly higher than those at P. purdomii, community, (2) Total root length, root length density, specific root length and specific root surface area in A. fabri were all significantly lower than that at P. purdomii, but average root diameter, total root volume and biomass density were significantly higher than that of P. purdomii. (3) Positive correlation between some morphological characteristics in both species and soil nutrients were detected by redundancy analysis. Particularly, soil available nitrogen and total phosphorus in P. purdomii community positively related with root length density, root specific surface area, respectively. Soil available nitrogen positively related with average root diameter in A. fabri forest. The present results suggested that different of root morphological characteristics between both forest types mainly attributed to the distinction of soil nitrogen and available phosphorus.

备注/Memo

备注/Memo:
收稿日期 Received: 2019-01-09 接受日期 Accepted: 2019-03-07
*中国科学院前沿科学重点研究计划项目(QYZDJ-SSW-DQC006)、国家自然科学基金(31770439,31570598,31100323)、国家重点研发计划课题项目(2017YFC0504900)和中国科学院水利部成都山地灾害与环境研究所“一三五”方向性项目(SDS-135-1707)及山地表生过程与生态调控重点实验室重点基金资助
**通讯作者 Corresponding author (E-mail: yyang@imde.ac.cn)
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更新日期/Last Update: 2019-03-13