Differential effects of grazing, water, and nitrogen addition on soil respiration and its components in a meadow steppe
| Autor: | Deli Wang, Wei Sun, Baoku Shi, Yunbo Wang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
geography Biomass (ecology) geography.geographical_feature_category Soil Science chemistry.chemical_element Context (language use) 04 agricultural and veterinary sciences Plant Science 01 natural sciences Nitrogen Grassland Soil respiration Agronomy chemistry Grazing 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Ecosystem Precipitation 010606 plant biology & botany |
| Zdroj: | Plant and Soil. 447:581-598 |
| ISSN: | 1573-5036 0032-079X |
| DOI: | 10.1007/s11104-019-04410-5 |
| Popis: | Understanding the influences of environmental variation and anthropogenic disturbance on soil respiration (RS) is critical for accurate prediction of ecosystem C uptake and release. However, surprisingly, little is known about how soil respiration and its components respond to grazing in the context of global climate change (i.e., precipitation or nitrogen deposition increase). We conducted a field manipulative grazing experiment with water and nitrogen addition treatments in a meadow grassland on the Songnen Plain, China, and assessed the combined influences of grazing and global change factors on RS, autotrophic respiration (RA), and heterotrophic respiration (RH). Compared with the control plots, RS, RA and RH all exhibited positive responses to water or nitrogen addition in the wet year, while a similar effect occurred only for RH in the dry year. The responses of RS to precipitation regimes were dominated by both frequency and amount. However, grazing significantly inhibited both soil respiration and its components in all subplots. Further analysis demonstrated that the plant root/shoot ratio, belowground biomass and microbial biomass played dominant roles in shaping these C exchange processes. These findings suggest that changes in precipitation regimes, nitrogen deposition, and land utilization may significantly alter soil respiration and its component processes by affecting local carbon users (roots and soil microorganism) and carbon substrate supply in meadow steppe grasslands. The future soil carbon sequestration in the studied meadow steppe will be benefited more by the moderate grazing disturbance. |
| Databáze: | OpenAIRE |
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