Long-term multi-nutrient enrichment enhances aboveground biomass without compromising ecosystem temporal stability in a Tibetan alpine meadow
文献类型：期刊论文
| 作者 | Zhang, Fawei; Du, Wei; Song, Chenggang; Li, Hongqin; Zhu, Jingbin; Liang, Naishen |
| 刊名 | AGRICULTURE ECOSYSTEMS & ENVIRONMENT
 |
| 出版日期 | 2025 |
| 卷号 | 394 |
| 关键词 | Nutrient enrichment Rainfall manipulation Vegetation biomass Biomass allocation Temporal stability Alpine meadow |
| 英文摘要 | Plant productivity in grasslands is constrained by nutrient and water limitations, yet how atmospheric nutrient deposition and altered precipitation regimes interactively regulate plant biomass allocation strategies and ecosystem stability remain poorly understood. We quantified responses of aboveground biomass (AGB), belowground biomass (BGB; 0-40 cm depth), the AGB/BGB ratio, and their temporal stability to multi-nutrient enrichment (nitrogen [N], phosphorus [P], and potassium [K]) and precipitation manipulation (+/- 50 % ambient rainfall) in an eight-year (2017-2024) factorial experiment conducted in a northeastern Qinghai-Tibetan Plateau alpine meadow. AGB increased by 14.2 % (K addition) to 52.6 % (NPK addition) compared to controls, with functional groups responding differentially. Nitrogen was identified as the primary driver of AGB enhancement, exhibiting additive effects when combined with P and/or K. In contrast, BGB responses were limited, showing significant increases (similar to 18 %) only under NPK, NK, and N with 50 % decreased rainfall (N-50 %) treatments. These BGB gains were driven by enhanced surface-layer (0-10 cm) biomass, which outweighed declines in subsurface soil layers (10-40 cm). The AGB/BGB ratio increased by 20.1 % in N addition treatment alone, supporting the optimal partitioning hypothesis. Scaling slopes of ln(BGB) versus ln(AGB) (log-transformed biomass) remained unaltered by other treatments, consistent with allometric growth theory under multi-nutrient enrichment. Temporal stability of AGB, BGB, and the AGB/BGB ratio remain unaffected, likely due to compensatory dynamics among functional groups and resistance of dominant graminoid species. These findings reveal divergent growth strategies that AGB increased significantly through functional group niche differentiation in response to nutrient enrichment, while BGB remained conservative and decoupled from aboveground dynamics. Our results challenge the presumed trade-off between productivity and stability, highlighting the resistance of species-rich alpine meadows to atmospheric nutrient deposition and precipitation variability. |
| 源URL | [http://210.75.249.4/handle/363003/62309]  |
| 专题 | 西北高原生物研究所_中国科学院西北高原生物研究所 |
| 推荐引用方式 GB/T 7714 | Zhang, Fawei,Du, Wei,Song, Chenggang,et al. Long-term multi-nutrient enrichment enhances aboveground biomass without compromising ecosystem temporal stability in a Tibetan alpine meadow[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2025,394. |
| APA | Zhang, Fawei,Du, Wei,Song, Chenggang,Li, Hongqin,Zhu, Jingbin,&Liang, Naishen.(2025).Long-term multi-nutrient enrichment enhances aboveground biomass without compromising ecosystem temporal stability in a Tibetan alpine meadow.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,394. |
| MLA | Zhang, Fawei,et al."Long-term multi-nutrient enrichment enhances aboveground biomass without compromising ecosystem temporal stability in a Tibetan alpine meadow".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 394(2025). |
入库方式： OAI收割
来源：西北高原生物研究所
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