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| 沙蒿对3种伴生植物种子萌发与幼苗生长的化感作用 |
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赵彦坤1,2, 柴成武2, 王方琳3,2, 胡小柯3, 何芳兰3,2
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1.武威市石羊河林业总场，甘肃 武威 733000;2.甘肃省治沙研究所 甘肃河西走廊森林生态系统定位观测研究站，甘肃 兰州 730073;3.甘肃省治沙研究所 甘肃省荒漠化防治重点实验室，甘肃 武威 733000
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| 摘要: |
| 【 目的】研究沙蒿次生物质的化感效应，揭示沙蒿与伴生物种的相互关系并为其在植被恢复中的合理 配置提供参考。【 方法】以沙蒿为供体植物，选择伴生植物藜（Chenopodium album L. ）、虎尾草（Chloris virgata Sw. ）、 盐生草（Halogeton glomeratus）为受体植物，研究3种受体植物种子萌发、幼苗生长及生理指标对不同质量浓度（5，25，50和100 mg/L）沙蒿植株水浸提液的响应特征。【 结果】3种受体植物种子萌发率均随浸提液质量浓度的升高而降 低，但响应程度不同。种子萌发阶段对化感物质的敏感性高于幼苗生长阶段，并以藜的敏感性最高，在浸提液质量浓度为100 mg/L时完全不能萌发；虎尾草在浸提液质量浓度为100 mg/L时萌发指标降至最低（萌发率19.91%）；盐生 草受低浓度浸提液影响较小，在浸提液质量浓度为100 mg/L时仍保持较高的萌发率（49.34%）。浸提液对3种受体 植物种子萌发率的抑制程度大于萌发速率，对根长、根干质量的抑制程度大于苗高、苗干质量。3种植物相对电导率（REC）、丙二醛（MDA）含量随浸提液质量浓度升高而增加，叶绿素（Chl）含量随浸提液质量浓度升高而降低，但敏感 性在不同植物间有一定差异。藜的REC在各质量浓度浸提液处理下均高于CK，虎尾草和盐生草REC仅在高质量浓 度处理时显著升高；虎尾草、盐生草MDA含量的增幅显著高于藜。【 结论】沙蒿植株水浸提液对3种伴生植物种子萌 发和幼苗生长的化感抑制作用大小表现为藜>虎尾草>盐生草；沙蒿水浸提液的化感抑制作用具有浓度依赖性和受 体植物特异性，其作用机制可能通过加剧受体植物膜质过氧化、损伤细胞膜并抑制光合作用等方式来实现。 |
| 关键词: 沙蒿 化感作用 伴生植物 种子萌发 幼苗生长 |
| DOI：10. 13207/j. jnwafu. 2026. 08. 017 |
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| 基金项目:甘肃省林业和草原科技创新项目（LCCX2025004）；中国工程院战略研究与咨询项目（2024-DFZD-32）；甘肃省第二批陇原青 年英才项目（（2023）11）；甘肃省重点研发计划项目（25YFFA073） |
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| Allelopathy of Artemisia desertorum Spreng.on seed germination and seedling growth of three associated plants |
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ZHAO Yankun1, CHAI Chengwu2, WANG Fanglin3,2, HU Xiaoke3, HE Fanglan3,2
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1.Shiyanghe Forestry General Farm of Wuwei City，Wuwei，Gansu 733000，China;2.Gansu Hexi Corridor Forest Ecosystem Research Station，Gansu Desert Control Research Institute，Lanzhou，Gansu 730070，China;3.Key Experiment of Desertification Prevention and Control in Gansu Province，Gansu Desert Control Research Institute，Wuwei，Gansu 733000，China
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| Abstract: |
| 【 Objective】The study aims to investigate the allelopathic effects of Artemisia desertorum secondary metabolites，elucidating its ecological interactions with associated species and its effective utilization in vegetation restoration.【Method】A.desertorum was used as the donor plant. Three associated species，namely Chenopodium album L. ，Chloris virgata Sw.and Halogeton glomeratus，were selected as recipient plants. The responses in seed germination，seedling growth，and physiological indicators of these three species were examined under different concentrations of A.desertorum aqueous extract（5，25，50，and 100 mg/L）.【Result】The seed germination rates of the three recipient plants all decreased with increasing extract concentration，but the extent of response varied. The germination stage was more sensitive to allelopathic substances than the seedling growth stage，with C.album L. showing the highest sensitivity-completely unable to germinate at an extract con?centration of 100 mg/L. In contrast，C.virgata Sw. exhibited the lowest germination index at 100 mg/L （19.91% germination rate），while H.glomeratus was less affected by low concentrations，maintaining a rela?tively high germination rate（49.34%） at 100 mg/L. The inhibition by the extract was greater on germination rate than on germination speed，and stronger on root length and root dry mass than on shoot height and shoot dry mass. With increasing extract concentration，relative electrical conductivity （REC） and malondialdehyde （MDA） content of the three species increased，while chlorophyll content decreased. However，sensitivities dif?fered among species.C.album L. consistently exhibited higher REC compared to the control across all concen?trations，whereas C.virgata Sw. and H.glomeratus showed significant REC elevation only at high concentra?tions. The increase in MDA content was significantly greater in C.virgata Sw. and H.glomeratus than in C.album L.【Conclusion】The allelopathic inhibition of water extract from A.desertorum on seed germination and seedling growth of the three associated plants followed the order：C.album L.>C.virgata Sw.>H.glomeratus.This allelopathic inhibition by A.desertorum extract was concentration-dependent and species-specific. The mechanism might involve the induction of membrane lipid peroxidation，cell membrane damage，and the suppres?sion of photosynthesis in the recipient plants. |
| Key words: Artemisia desertorum allelopathy associated plants seed germination seedling growth |
