草地学报2026，Vol.34Issue(3)：973-983,11.DOI:10.11733/j.issn.1007-0435.2026.03.021
氮添加对科尔沁典型草原植物种间关联及生态位的影响
Effects of Nitrogen Addition on Interspecific Association and Niche of Plants in Typical Steppe of Horqin
摘要
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 addi-tion 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(ΔOik=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 ΔOik<0.In conclusion,N addition enhances the nega-tive interspecific associations of the community and niche differentiation,leading to variations in resource use efficiency among species.关键词
氮添加/种间关联/生态位/温性草原Key words
Nitrogen addition/Interspecific association/Niche/Temperate steppe分类
农业科技引用本文复制引用
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):973-983,11.基金项目
内蒙古自治区重点研发和科技成果转化计划项目(2022YFDZ0087) （2022YFDZ0087）
高校基本科研业务费项目(GXKY25Z006) （GXKY25Z006）
内蒙古民族大学博士科研启动基金(BS522)资助 （BS522）
