Within-ecosystem patch variation drives overlooked spatial heterogeneity in alpine soil CO2 and CH4 fluxes
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ID: 320178
2026
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Abstract
Abstract Soil carbon fluxes exhibit substantial spatial heterogeneity, yet this variability is typically assessed across contrasting ecosystems. Fine-scale fluxes heterogeneity within ecosystems remains largely unaccounted for, which may bias regional carbon budget estimates. Here we present two-year in situ measurements of soil CO2 and CH4 fluxes across six representative patch types within three alpine ecosystems on the Tibetan Plateau (i.e., healthy and degraded patches in mesic meadows, tussocks and pools in wet meadows, and hollows and hummocks in wetlands). We quantify within-ecosystem patch variability in carbon fluxes and examine its effects on landscape-scale flux variation and inferred drivers. Our results showed that patches significantly affected soil carbon fluxes within ecosystems, with effect sizes that varied across ecosystem types and seasons. In mesic meadows, the variation of soil carbon fluxes between degraded and healthy patches were most pronounced during the non-growing season, with CH4 fluxes differing by up to 88%. In wet meadows and wetlands, larger differences in soil carbon fluxes occurred during the growing season, with tussock-pool contrasts reaching 142% for CH4 fluxes and hollow–hummock contrasts reaching 250% for CO2 and 191% for CH4 fluxes. Furthermore, incorporating patch variation increased landscape-scale CH4 variability and changed the regulating drivers, weakening the influence of microclimates while strengthening the roles of soil properties (for CO2) and microbial and soil factors (for CH4). These findings identify within-ecosystem patches as a critical yet overlooked driver of soil carbon fluxes heterogeneity, underscoring the need to incorporate fine-scale variation into predictions of regional carbon cycling.
| Reference Key |
openalex_W7167598175
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| Authors | Jianbin Wang, Juanjuan Zhang, J H, Dong Xie, Hongyu Jiang, Huimin Zhou, Z D Zhang, Chao Song, Jin He, Hao Wang |
| Journal | journal of plant ecology |
| Year | 2026 |
| DOI |
10.1093/jpe/rtag159
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| URL | |
| Keywords | Keywords not found |
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