中西部荒漠草原区植物根系-土壤系统生态化学计量变化及环境响应

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中图分类号：S812.2 文献标识码：A 文章编号：1007-0435（2025）09-2921-10

doi：10.11733/j.issn.1007-0435.2025.09.017

Ecological Stoichiometric Changes and Responses to Environment of Plant Root-Soil System in Desert Grassland Region of Central and Western Inner Mongolia

YU Ya-nan1，GE Nan²，WANG Bo1* ，LI Yu-wei¹，LYU Nan1，WANG Chuan-qi1，LI Xin1 （1.CollegeofGeograpicalSiences，InerongoliaNormalUniversityHohhot，Innerongoliao，Cina; 2.InstituteofWaterResourcesforPastoralArea，MinistryofWaterResources，Hohhot，InnerongoliaooChina）

Abstract：In order to reveal the environmental response mechanism of element transformation and recycling between plant roots and soil system in the desert steppe ofcentral and western Inner Mongolia，the contents of carbon，nitrogen and phosphorus in plant roots and soil（ ：0-60cm ）were measured，and the ecological stoichiometry of elements and the change characteristics of regional climate elements were calculated and analyzed.The results showed that the C content of plant roots was the highest （32.42%） ，the P content was the lowest （20 （0.28%） ，andthe C：N coefficient of variation was the largest. Soil C，N， C：P and N：P increased first and then decreased with the increase of soil depth，and soil C：N increased steadily in the vertical direction.Plant roots were correlated with soil C，N，Pand various environmental factors to varying degrees. Climatic factors such as temperature and precipitation are the main influencing factors.In conclusion，the content of soil available nitrogen inthe desert steppe area of Inner Mongoliaislow，and nitrogen hasbecome one of the key limiting factors restricting the growth of plants.At the same time，the soil ecological stoichiometric characteristics in this area were complex in the vertical direction. Climate factors，such as wetness index，average annual temperature，and annual precipitation，were the dominant factors，which mainly changed soil physicaland chemical properties and plant living environment by redistributing heat and water，and finally comprehensively affected the element cycling and material transformation between root and soil system in this area.

Key words：Plant root system；Soil; Environmental factors;Ecological stoichiometry

生态化学计量学是将生态学研究方法、原理与化学计量学相结合，研究生物体元素组成及其相互作用，明确化学元素分布规律及转化路径，以达到充分认知生态系统养分循环和供需平衡关系的目的[1-3]。（剩余16031字）