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【背景】包括紫茎泽兰在内的许多外来植物都能够与新入侵生境的丛枝菌根真菌(AMF)形成互利共生,因此菌根真菌如何调节外来植物种的入侵是当前亟待研究的问题。【方法】测定了紫茎泽兰入侵不同阶段(紫茎泽兰呈零星丛状分布于本地植物群落中[部分入侵生境]及紫茎泽兰单优群落形成期[入侵生境])的土壤化学性状,而后通过野外试验,采用杀真菌剂处理,研究了包括AMF在内的土壤真菌对紫茎泽兰入侵的反馈作用。【结果】紫茎泽兰入侵改变了土壤化学性状。施用杀真菌剂降低了紫茎泽兰叶面积、叶片碳、氮、磷、和δ13C含量。【结论与意义】综合分析发现,在紫茎泽兰与本地植物混生群落中,土壤真菌能够增加紫茎泽兰叶片碳和δ13C含量,但是不能提高紫茎泽兰的光合作用,表明碳和δ13C含量的提高,不是光合作用的结果,而是通过其他机制实现的。因此可以得出,在部分入侵生境中,碳从土壤或临近植物经由菌丝网向紫茎泽兰转移。紫茎泽兰入侵不同阶段土壤养分的变化利于紫茎泽兰种群建立,同时利于紫茎泽兰借助真菌(尤其是AMF)从土壤或临近植物转移碳,促进种群扩散,这可能是紫茎泽兰入侵的机制之一。
【Background】 Many exotic plants, including Eupatorium adenophorum, can form symbiotic interactions with arbuscular mycorrhizal fungi (AMF) in newly invaded habitats. Therefore, how mycorrhizal fungi regulate the invasion of exotic plant species is an urgent issue to be studied . 【Method】 The soil chemistry of Eupatorium adenophorum was determined at different stages of invasion (Eupatorium adenophorum showed sporadic plexiform distribution in the local plant community [partial invasion habitat] and the formation of single superior community of Eupatorium adenophorum [invasion habitat]) Traits, and then through the field experiments, the use of fungicides treatment, including AMF soil fungi, the invasion of E. adenophorum feedback role. 【Result】 Eupatorium adenophorum changed the soil chemical properties. Application of fungicides decreased leaf area, leaf carbon, nitrogen, phosphorus, and δ13C content in Eupatorium adenophorum. 【Conclusion and significance】 The results showed that soil fungi could increase the leaf carbon and δ13C content of Eupatorium adenophorum, but could not increase the photosynthesis of Eupatorium adenophorum, suggesting that carbon and δ13C The increase in content is not the result of photosynthesis, but is achieved through other mechanisms. Therefore, it can be concluded that in some invasive habitats, carbon is transferred from the soil or the neighboring plants to the E. adenophorum via mycelium. The changes of soil nutrients in different stages of A. adenophora invasion could promote the establishment of E. adenophorum population and at the same time facilitate the transfer of carbon from soils and nearby plants by fungi (especially AMF) and promote the population dispersal. One of the mechanisms of blue intrusion.