中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地理科学与资源研究所
  3. 中国科学院地理科学与资源研究所
  4. 生态系统研究网络观测与模拟重点实验室
  5. 外文论文
Competition between shrubs and grasses in a shrub-encroached temperate grassland: Implications from nitrogen acquisition

文献类型：期刊论文

作者Li, Zhaoxi1; Tian, Yuqiang1; Song, Minghua2; Yu, Mengmeng1; Li, Xiaobing1; Zhang, Yong3; Huang, Jinlu1; Su, Zhaowen1; Sun, Siyu1; Dai, Hongmiao1
刊名BIOLOGY AND FERTILITY OF SOILS
出版日期2025-06-09
卷号N/A
关键词Competition N-15 labelling Nitrogen uptake Shrubs Slope locations Soil microbial regulation
ISSN号0178-2762
DOI10.1007/s00374-025-01926-0
产权排序2
文献子类Article ; Early Access
英文摘要In recent decades, shrub encroachment in arid temperate grasslands globally has heightened resources competition especially for nitrogen (N), a vital element for plant growth, between encroaching shrubs and native grasses. Despite this, it remains unclear whether shrubs and grasses adopt distinct N acquisition strategies and how these might impact their competitive dynamics, with the regulatory role of soil microbes in this competition also being poorly understood. We conducted an in-situ(15)N labelling experiment in a shrub-encroached temperate grassland with significant slope variations of North China. The study aimed to investigate the competition for N acquisition among shrubs, grasses, and soil microbes. The results revealed that both shrubs and grasses preferred to absorb NO3- (> 60% of total N uptake) across soil depths. However, in the subsoil (10-30 cm) at the upper slope, shrubs displayed significantly 2.71 times higher total N uptake compared to grasses due to their deeper roots. The ratio of N uptake by shrubs to grasses (R-S/G) for different N forms was consistently higher in the subsoil, and that for total N uptake of subsoil was greater at both upper (1.54 times) and lower (0.52 times) slopes. Moreover, the R-S/G in the subsoil or overall soil depth was markedly higher at upper than lower slope. The competition for N between shrubs and grasses also regulated by soil microbes, with higher N-15 recovery in soil microbes (R-M) than plants (R-S or R-G). Structural equation model (SEM) revealed that location changes directly and indirectly regulated R-S/G through plant-soil feedbacks. Increased soil depth lowered soil organic matter (SOM), soil microbial biomass N (MBN), and soil water content (SWC), but increased the root biomass of shrubs. Lower slopes have associated higher MBN and SWC, but less root biomass of shrubs. SWC enhanced MBN, which reduced the root biomass of shrubs. SOM lowered R-S/G, whereas the root biomass of shrubs increased it. The mechanistic framework explained that the competition for N between shrubs and grasses was more intense in the subsoil and particularly pronounced at the upper slope in the temperate shrub encroached grasslands of North China.
URL标识查看原文
WOS关键词ORGANIC-NITROGEN ; SOIL MICROBES ; INORGANIC NITROGEN ; CARBON ; BIOMASS ; PLANTS ; MICROORGANISMS ; SEQUESTRATION ; MECHANISMS ; STRATEGIES
WOS研究方向Agriculture
语种英语
WOS记录号WOS:001504400200001
出版者SPRINGER
源URL[http://ir.igsnrr.ac.cn/handle/311030/214536]  
专题生态系统网络观测与模拟院重点实验室_外文论文
通讯作者Tian, Yuqiang
作者单位1.Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Disaster Risk R, Beijing 100875, Peoples R China;
2.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China;
3.Chinese Acad Agr Sci, Inst Grassland Res, Hohhot 010010, Peoples R China
推荐引用方式
GB/T 7714		 Li, Zhaoxi,Tian, Yuqiang,Song, Minghua,et al. Competition between shrubs and grasses in a shrub-encroached temperate grassland: Implications from nitrogen acquisition[J]. BIOLOGY AND FERTILITY OF SOILS,2025,N/A.
APA Li, Zhaoxi.,Tian, Yuqiang.,Song, Minghua.,Yu, Mengmeng.,Li, Xiaobing.,...&Dai, Hongmiao.(2025).Competition between shrubs and grasses in a shrub-encroached temperate grassland: Implications from nitrogen acquisition.BIOLOGY AND FERTILITY OF SOILS,N/A.
MLA Li, Zhaoxi,et al."Competition between shrubs and grasses in a shrub-encroached temperate grassland: Implications from nitrogen acquisition".BIOLOGY AND FERTILITY OF SOILS N/A(2025).

入库方式： OAI收割

来源：地理科学与资源研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。