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李朝婵,钱沉鱼,全文选,唐凤华,欧静.野生露珠杜鹃林不同分解层土壤化感潜力评价.生态学报,2018,(13).http://dx.doi.org/10.5846/stxb201708041400  
野生露珠杜鹃林不同分解层土壤化感潜力评价
Allelopathic potential evaluation of different soil decomposition layers in wild Rhododendron irroratum forest
投稿时间:2017-08-04  修订日期:2018-02-07
DOI: 10.5846/stxb201708041400
关键词野生杜鹃  土壤  化感效应  群落更新  化感作用
Key Wordswild Rhododendron  soils  allelopathic effect  community germination  allelopathy
基金项目国家自然科学基金项目(31460136, 31560223);中央引导地方科技发展专项资金项目(黔科中引地[2017]4006);贵州省林业厅项目(黔林科合[2016]09);贵州省科技厅联合基金项目(黔科合LH字[2016]7203号)
作者单位E-mail
李朝婵 山地环境重点实验室 chaochanl@gznu.edu.cn 
钱沉鱼 山地环境重点实验室  
全文选 贵州师范大学 wenxuanq@gznu.edu.cn 
唐凤华 贵州师范大学  
欧静 贵州大学  
摘要点击次数 173
全文下载次数 51
摘要:
探明野生杜鹃群落不同层次土壤浸提物的化学成分及其含量差异,为阐明杜鹃群落天然更新障碍与化感作用之间的关系提供基础数据,从化学生态学角度解释群落天然更新障碍的原因。通过种子发芽试验,比较凋落物层(L层)、腐殖质层(H层)和土壤表层(S层)浸提液对自身种子萌发的化感效应,采用内标法结合气相色谱-质谱(GC/MS)联用等技术鉴定土壤浸提液所含的有机化合物。(1)种子发芽试验显示,露珠杜鹃不同土壤层浸提液的化感效应不同。L层的抑制作用最为强烈,其浸提液显著抑制自身种子的萌发。H层和S层对自身具有一定的抑制作用,与对照相比不显著;(2)鉴定了不同层次土壤浸提液中所含的有机化合物,L层、H层和S层均检测出31种组分,其中相对含量大于5%的组分分别有6、8和8种。L层浸提液主要化感成分为丙三醇和棕榈酸,分别达到总量的19.56%和19.17%;H层主要化感成分为2-羟基丙酸和棕榈酸,分别达到总量的14.05%和12.48%;S层土壤浸提物的主要化感成分为棕榈酸和2-羟基乙酸,分别达到总量的14.91%和12.79%。野生露珠杜鹃不同土壤浸提物的化感物质含量以L层最高,L层作为群落土壤化感物质的主要来源;从化感物质组分来分,长链脂肪酸和有机酸类是H层和S层主要的化感物质种类,长链脂肪酸类和醇类是L层主要的化感物质种类。杜鹃群落林下土壤中存在的化感物质可能是其天然更新障碍的重要原因之一。
Abstract:
The chemical composition of extractions of different soil layers from a Rhododendron irroratum forest was analyzed to provide basic data on the relationships between the community’s natural regeneration barrier and allelopathy and to explain the natural regeneration barrier factors from the perspective of chemical ecology. The allelopathic effects of litter layer (L layer), humus layer (H layer), and soil layer (S layer) extractions were compared using seed germination methods. The organic compounds in the three extractions were assessed using the internal standard method with gas chromatography-mass spectrometry (GC/MS). (1) The seed germination test showed that of the three layers, L layer had the strongest inhibitory effect and its extraction inhibits seed germination, while H layer and S layer had some inhibitory effect that was not significant compared with the control. (2) Thirty-one components were identified from the organic compounds of L layer, H layer, and S layer, in which there were 6, 8, and 8 kinds, respectively, with relative contents of more than 5%. The main allelochemical components of L layer are glycerol and palmitic acid, with relative contents as high as 19.56% and 19.17%; the main allelochemical components of H layer are 2-hydroxypropanoic acid and palmitic acid, with relative contents up to 14.05% and 12.48%; and the main allelochemical components of L layer are palmitic acid and 2-hydroxyacetic acid, with relative contents as high as 14.91% and 12.79%. L layer had the highest contents of allelochemical compounds, and L layer was the main source of soil allelochemicals. The main allelochemicals in H layer and S layer were long-chain fatty acids and organic acids, and the major allelochemicals in L layer were long-chain fatty acids and alcohols. The allelochemicals of Rhododendron community soils might be one of the main reasons for the natural regeneration barrier in this community.
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