Effects of Nitrogen Addition on Interspecific Association and Niche of Plants in Typical Steppe of Horqin

doi:10.11733/j.issn.1007-0435.2026.03.021

Acta Agrestia Sinica ›› 2026, Vol. 34 ›› Issue (3): 973-983.DOI: 10.11733/j.issn.1007-0435.2026.03.021

Effects of Nitrogen Addition on Interspecific Association and Niche of Plants in Typical Steppe of Horqin

FAN Xu-bin, YAN Bao-long, ZHANG Shu-han, GAO Ming-yue

College of Prataculture/Mountain Grassland Ecosystem Positioning Research Station, Inner Mongolia Minzu University, Tongliao, Inner Mongolia 028000, China

Received:2025-04-18 Revised:2025-05-26 Published:2026-03-23

氮添加对科尔沁典型草原植物种间关联及生态位的影响

樊绪彬, 闫宝龙, 张书涵, 高明月

内蒙古民族大学草业学院/山地草原生态系统定位研究站, 内蒙古通辽 028000

通讯作者: 闫宝龙，E-mail：byan@imun.edu.cn
作者简介:樊绪彬（2000-），男，汉族，甘肃张掖人，硕士生，主要从事草地生态与管理方面的研究，E-mail：1979162367@qq.com；
基金资助:
内蒙古自治区重点研发和科技成果转化计划项目（2022YFDZ0087）；高校基本科研业务费项目（GXKY25Z006）；内蒙古民族大学博士科研启动基金（BS522）资助

Abstract

Abstract: To explore the effects of nitrogen （N） deposition on interspecific associations and niches of grassland plants， this study was conducted in the Horqin typical steppe. Nine treatments were set up， including the addition of inorganic N （I） and organic N （O） at three rates （0， 4， and 8 g·m^-2·a^-1） and their combinations（I₀O₀， I₄O₀， I₈O₀， I₀O₄， I₀O₈， I₄O₄， I₈O₄， I₄O₈， and I₈O₈）. The results showed that the plant community exhibited a random distribution under the treatments without inorganic N addition， a positive association under the I₄O₀ treatment and a negative association under the I₈O₀ treatment. Niche responses were species-specific： the niche breadth of Bassia prostrata in the I₈O₄ treatment was 58.3% higher than that in the I₄O₈ treatment （P<0.05）； Agropyron cristatum maintained a relatively high and stable niche breadth （0.32~0.36） across all treatments， and the proportion of high niche overlap of this species reached 87% under the I₈O₈ treatment. The ecological response rate （R=2.65-2.97） and niche overlap index （ΔO_ik=0.120~0.138） of A. cristatum were relatively stable； the R value of Artemisia scoparia surged to 140.50 under the I₈O₀ treatment； the R value of Lespedeza davurica remained negative （-1.62 to -0.66） with ΔO_ik<0. In conclusion， N addition enhances the negative interspecific associations of the community and niche differentiation， leading to variations in resource use efficiency among species.

Key words: Nitrogen addition, Interspecific association, Niche, Temperate steppe

摘要： 为探究氮沉降对草地植物种间关联及生态位的影响，本研究以科尔沁典型草原为对象，添加无机态氮（I）和有机态氮（O）各0，4，8 g·m^-2·a^-1（纯氮）及其组合共9个处理，即I₀O₀，I₄O₀，I₈O₀，I₀O₄，I₀O₈，I₄O₄，I₈O₄，I₄O₈，I₈O₈。结果表明：植物群落在不添加无机态氮处理下呈随机分布，在I₄O₀处理下物种间呈正关联，在I₈O₀处理下物种间呈负关联；生态位响应具有物种特异性，木地肤（Bassia prostrata）生态位宽度在I₈O₄处理下较I₄O₈提升58.3%（P<0.05），冰草（Agropyron cristatum）在各处理下，生态位宽度较高且稳定（0.32~0.36），并在I₈O₈处理下物种生态位高度重叠比例达87%；冰草的生态响应速率（R=2.65~2.97）与生态位重叠指数（ΔO_ik=0.120~0.138）均较平稳，猪毛蒿（Artemisia scoparia）在I₈O₀处理下R值激增至140.50，达乌里胡枝子（Lespedeza davurica）R值持续为负（-1.62~-0.66）且ΔO_ik<0。综上，氮添加增强群落种间负关联及生态位分化，导致物种资源利用效率各异。

关键词: 氮添加, 种间关联, 生态位, 温性草原

CLC Number:

S812

FAN Xu-bin, YAN Bao-long, ZHANG Shu-han, GAO Ming-yue. Effects of Nitrogen Addition on Interspecific Association and Niche of Plants in Typical Steppe of Horqin[J]. Acta Agrestia Sinica, 2026, 34(3): 973-983.

樊绪彬, 闫宝龙, 张书涵, 高明月. 氮添加对科尔沁典型草原植物种间关联及生态位的影响[J]. 草地学报, 2026, 34(3): 973-983.

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Effects of Nitrogen Addition on Interspecific Association and Niche of Plants in Typical Steppe of Horqin

氮添加对科尔沁典型草原植物种间关联及生态位的影响

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