Nonlinear response of soil microbial necromass nitrogen to nitrogen addition gradient in an alpine grassland
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2026
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Abstract
Abstract Microbial necromass nitrogen (N) constitutes a major component of soil N pools, and elucidating its response to N enrichment is essential for optimizing fertilizer management in grassland ecosystems. However, the effects of varying N addition levels on microbial necromass N and the underlying mechanisms remain elusive. Here, we leveraged a decade-long field experiment in an alpine meadow on the Qinghai-Tibetan Plateau (QTP), applying six N addition levels (0, 2, 4, 8, 16, 32 g N m−2 yr−1) to investigate the response of microbial necromass N and its key drivers. Microbial necromass N exhibited a nonlinear response to N enrichment, remaining stable under low N inputs (2, 4, and 8 g N m−2 yr−1) but increasing significantly at higher N addition levels (16 and 32 g N m−2 yr−1). Across all treatments, microbial necromass N accounted for 67–76% of total soil N. Nitrogen-induced changes in plant, soil, and microbial factors collectively explained 60% of the variation in microbial necromass N. Among these, soil factors were the dominant predictors, accounting for 34% of the total variance, with mineral protection (Feo + Alo) and soil inorganic nitrogen (SIN) identified as the primary drivers. These findings highlight the pivotal role of microbial necromass N in soil N storage and its nonlinear response to N enrichment, underscoring the importance of effective N management for enhancing soil N retention and stability in alpine grasslands.
| Reference Key |
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| Authors | Quan-Cheng Wang, Yì Wáng, Yang Li, Houkun Chu, Ronglei Zhou, Ning Liu, Mengjie Liu, Fangfang Ma, Chen Chen, Jingjing Shi, Huichen Zhang, Ruifa Wang, Shuli Niu |
| Journal | journal of plant ecology |
| Year | 2026 |
| DOI |
10.1093/jpe/rtag132
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| URL | |
| Keywords | Keywords not found |
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