Abstract
Purpose
The theory of ecological stoichiometry has improved understanding of nutrient circulation processes in ecosystems. The purpose of this work was to study ecological stoichiometric characteristics of carbon, nitrogen and phosphorus in wetland soils of Sanjiang Plain, northeast China.
Materials and methods
A Deyeuxia angustifolia wetland (swamp meadow) and a Carex lasiocarpa wetland (marsh) were chosen for collection of soil cores (0–30 cm depth). Soil organic carbon, total nitrogen and phosphorus were analyzed to study patterns of C/N (R CN), C/P (R CP), N/P (R NP), and C/N/P (R CNP) in wetland soils.
Results and discussion
Soil carbon, nitrogen and phosphorus stoichiometry differed between the two wetlands. Soil RCN (0–30 cm depth) in the D. angustifolia wetland was close to that in C. lasiocarpa wetland (12.97 and 12.80, respectively), but R CP and R NP in C. lasiocarpa soils were significantly higher than those in D. angustifolia soils. R CN changed little within soil profile, without obvious trends in both wetlands. Both R CP and R NP decreased with depth from the surface, and both R CP and R NP were higher at every depth interval in C. lasiocarpa soils compared to D. angustifolia soils. R CN in surface soil (0–10 cm, organic-rich “Lo” layer) was not significantly different from R CN in the entire profile (0–30 cm, “La layer”) of D. angustifolia wetland, while R CP and R NP were both significantly different between the Lo and La layers. In Carex lasiocarpa wetland, R CN, R CP and R NP in Lo layer were significant higher than those in La layer. R CNP in La layer of D. angustifolia and C. lasiocarpa wetlands were 65:5:1 and 163:13:1, respectively.
Conclusions
Soil R CN was relatively consistent, while R CP and R NP reflected P limitation in wetlands of Sanjiang Plain. Further research is needed to determine whether these ratios hold among other wetland ecosystems.
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Acknowledgements
We are grateful for the financial support from the National Science of Foundation of China (Nos. 40111092 and 40830535) and the CAS/SAFEA International Partnership Program for Creative Research Teams. We thank Professor Christopher B. Craft and Yanlong He for their help in soil sample collection. We thank Anne Altor for her help in language revision and anonymous reviewers for critical comments.
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Zhang, Z., Lu, X., Song, X. et al. Soil C, N and P stoichiometry of Deyeuxia angustifolia and Carex lasiocarpa wetlands in Sanjiang Plain, Northeast China. J Soils Sediments 12, 1309–1315 (2012). https://doi.org/10.1007/s11368-012-0551-8
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DOI: https://doi.org/10.1007/s11368-012-0551-8