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Positive effects of leguminous shrub encroachment on multiple ecosystem functions of alpine meadows and steppes greatly depended on increasing soil nutrient

文献类型： 外文期刊

作者： Yang, Wen 1 ; Qu, Guangpeng 3 ; Kelly, Austin R. 4 ; Wu, Gao-Lin 1 ; Zhao, Jingxue 1 ;

作者机构： 1.Lanzhou Univ, State Key Lab Herbage Improvement & Grassland Agro, Lanzhou 730000, Peoples R China

2.Lanzhou Univ, Coll Ecol, Lanzhou 730000, Peoples R China

3.Tibet Acad Agr & Anim Husb Sci, Grassland Sci Inst, State Key Lab Hulless Barley & Yak Germplasm Resou, Lhasa 850002, Peoples R China

4.Texas A&M Univ, Dept Ecol & Conservat Biol, College Stn, TX USA

5.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess Pl, Yangling 712100, Shaanxi, Peoples R China

6.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China

关键词： Alpine grassland; Functioning; Grassland type; Leguminous shrubs; Shrub encroachment

期刊名称：CATENA （ 影响因子：6.2； 五年影响因子：6.4 ）

ISSN： 0341-8162

年卷期： 2024 年 236 卷

页码：

收录情况： SCI

摘要： Shrub encroachment in grassland ecosystems is projected to intensify worldwide because of rapid climate change and anthropogenic activity, amplifying the encroachment of woody shrubs and strongly altering the ecosystem function. The effects of leguminous shrub encroachment on multiple dimensions of ecosystem functioning, however, remains poorly understood. This study experimentally quantified the effects of leguminous shrub encroachment (primarily Caragana spinifera Kom.) on various ecosystem functionality relevant to plant diversity, productivity, and storage of soil carbon (C) and nitrogen (N) in alpine meadows and steppes. Further, the study assessed the potential influences of shrub encroachment on ecosystem multifunctionality (EMF, EMF-diversity, EMF-productivity, EMF-C, and EMF-N). Our findings suggest that leguminous shrub encroachment enhanced ecosystem multifunctionality in alpine meadows and steppes. Plant diversity and aboveground biomass of her-baceous species increased after leguminous shrub encroachment. Additionally, the impacts of leguminous shrub encroachment on belowground biomass differed with grassland types, increasing in alpine steppes but decreasing in alpine meadows. The shrub encroachment resulted in significant increases in soil nitrogen and overall nutrient contents in both forms of alpine grasslands. Our findings highlight that shrub encroachment's increasing of ecosystem multifunctionality was closely related to the promotion of plant diversity, biomass of herbaceous plants, and soil nutrients. Overall, our study demonstrates that the encroachment of leguminous shrubs can promote ecosystem multifunctionality in both alpine meadows and alpine steppes. These findings expand our understanding of the ecosystem functioning in leguminous shrub-encroached alpine meadows and steppes.

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