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- Title
Soil C : N : P Stoichiometry as Related to Nitrogen Addition in a Meadow Steppe of Northern China.
- Authors
Wang, X. G.; Wuyunna; Lü, X. T.; Yang, G. J.; Coombs, C. E. O.; Du, X.; Song, Y. T.; Zhang, F. J.; Huo, G. W.; Han, X. G.
- Abstract
The concentrations and stoichiometry of soil carbon (C), nitrogen (N), and phosphorus (P) have critical implications for nutrient cycling and ecosystem function. While their high sensitivity to atmospheric N deposition is well known, it remains unclear for the soil depth-dependence of such responses to N deposition. Here, we examined the responses of soil C : N : P stoichiometry at three soil depths in the upper humus horizon (0–5, 5–10, and 10–20 cm) of Haplic Chernozem (Loamic) across a gradient of urea addition rates (0, 2, 10, 20, and 50 g N m–2 year–1) after five years treatments in a hay-harvest meadow steppe of northern China. We found that the effects of increasing N addition rates on the concentrations and stoichiometry of soil C, N and P did not depend on soil depth, though those parameters varied greatly across different soil layers. Across all soil depths, the concentrations of soil C and N increased with increasing N addition rates, but soil P concentration was not affected by N addition. The higher sensitivity of soil N than soil C to N enrichment resulted in decreasing soil C : N ratio across the N addition gradient, especially for the surface soil layer. Soil N : P ratio showed a positive response to the increases of N addition rates. The unbalanced responses of soil C, N, and P concentrations to N enrichment, as indicated by the decreases of soil C : N ratio and the increases of soil N : P ratio across the N addition gradient, highlighted the role of N enrichment in decoupling soil nutrient cycling in the temperate steppe.
- Subjects
CHINA; STEPPES; SOILS; SOIL depth; STOICHIOMETRY; NUTRIENT cycles; CHERNOZEM soils
- Publication
Eurasian Soil Science, 2021, Vol 54, Issue 10, p1581
- ISSN
1064-2293
- Publication type
Article
- DOI
10.1134/S1064229321100124