首页|Increased dependence on nitrogen-fixation of a native legume in competition with an invasive plant

Increased dependence on nitrogen-fixation of a native legume in competition with an invasive plant

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Suppression of roots and/or their symbiotic microorganisms,such as mycorrhizal fungi and rhizobia,is an effective way for alien plants to outcompete native plants.However,little is known about how invasive and native plants interact with the quantity and activity of nutrient-acquisition agents.Here a pot experiment was conducted with monoculture and mixed plantings of an invasive plant,Xanthium strumarium,and a common native legume,Glycine max.We measured traits related to root and nodule quantity and activity and mycorrhizal colonization.Compared to the monoculture,fine root quantity(biomass,surface area)and activity(root nitrogen(N)concentration,acid phosphatase activity)of G.max decreased in mixed plantings;nodule quantity(biomass)decreased by 45％,while nodule activity in N-fixing via rhizobium increased by 106％;mycorrhizal colonization was unaffected.Contribution of N fixation to leaf N content in G.max increased in the mixed plantings,and this increase was attributed to a decrease in the rhizosphere soil N of G.max in the mixed plantings.Increased root quantity and activity,along with a higher mycorrhizal association was observed in X strumarium in the mixed compared to monoculture.Together,the invasive plant did not directly scavenge N from nodule-fixed N,but rather depleted the rhizosphere soil N of the legume,thereby stimulating the activity of N-fixation and increasing the dependence of the native legume on this N source.The quantity-activity framework holds promise for future studies on how native legumes respond to alien plant invasions.

Mycorrhizal strategyNitrogen depletionPlant invasionRoot nutrient acquisition strategySymbiotic nitrogen fixation

Meixu Han、Haiyang Zhang、Mingchao Liu、Jinqi Tang、Xiaocheng Guo、Weizheng Ren、Yong Zhao、Qingpei Yang、Binglin Guo、Qinwen Han、Yulong Feng、Zhipei Feng、Honghui Wu、Xitian Yang、Deliang Kong

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College of Forestry,Henan Agricultural University,Zhengzhou 450002,China

College of Life Science,Hebei University,Baoding 071002,China

Liaoning Key Laboratory for Biological Invasions and Global Changes,College of Bioscience and Biotechnology,Shenyang Agricultural University,Shenyang,Liaoning 110866,China

College of Horticulture,China Agricultural University,Beijing 100193,China

State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China

Key Laboratory of Arable Land Quality Monitoring and Evaluation,Ministry of Agriculture and Rural Affairs,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China

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国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金leading talents of basic research in Henan ProvinceFunding for Characteristic and Backbone Forestry Discipline Group of Henan ProvinceScientific Research Foundation of Henan Agricultural UniversityResearch Funds for overseas returnee in Henan Province,China国家重点研发计划

32171746318705224207745032371786305008542019YFE0117000

2024

10.1016/j.pld.2024.04.003

植物多样性(英文)
中国科学院昆明植物研究所，中国植物学会

植物多样性(英文)

CSTPCD
影响因子：0.617
ISSN：2096-2703
年,卷(期)：2024.46(4)
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