Stoichiometric patterns of soil carbon, nitrogen, and phosphorus in farmland of the Poyang Lake region in Southern China
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Previous studies have reported the occurrence of a Redfield-type ratio (e.g., C/N/P, C/N, C/P, or N/P) between C, N, and P concentrations in marine and (in part) terrestrial ecosystems. Herein, we aimed to determine whether a similar Redfield-type ratio can occur in farmland soil, as well as to elucidate how the C, N, and P ratios change with farmland-use types, soil physicochemical properties, and environmental factors.
Materials and methods
The stoichiometric patterns of soil C, N, and P in farmland were analyzed based on 6150 samples (0–20 cm) collected in 2012 by the Soil Testing and Formulated Fertilization Project in the Poyang Lake region of Southern China.
Results and discussion
The average soil C/N/P ratio in farmland of the study region was 98.4:16:1, which was slightly lower than the Redfield ratio of 106:16:1. There was no significant correlation between the concentrations of C, N, and P, indicating the absence of Redfield-type C/N/P, C/P, and N/P ratios. In contrast, the correlation between the concentrations of C and N was significant, indicating the presence of a stable Redfield-type C/N ratio in farmland soil. The average soil C/N, C/P, and N/P ratios corresponding to various farmland-use types showed significant differences (p < 0.01). In addition, all three ratios showed significant correlation with the latitude, soil pH, and mean annual precipitation.
There are no stable Redfield-type C/N/P, C/P, and N/P ratios while a stable Redfield-type C/N ratio exists in farmland soil in the Poyang Lake region. We urgently need to carry out ecological control experiments and field fertilization observations to understand the relationship between the stability of soil elements and fertilizer application in farmland.
KeywordsEcological stoichiometry Farmland-use type Poyang Lake region Redfield-type ratio
This work was supported by the National Key R&D Program of China (Grant No. 2017YFD0301603).
- Arunachalam K, Arunachalam A (2006) Nitrogen availability and N mineralization under different land use types in the humid tropics of Arunachal Pradesh. Tropic Ecol 47:99–107Google Scholar
- Cleveland CC, Townsend AR, Constance BC, Ley RE, Schmidt SK (2010) Soil microbial dynamics in Costa Rica: seasonal and biogeochemical constraints. Biotropica 36:184–195Google Scholar
- Hu PL, Wang KL, Zeng SX, Zhang H, Li SS, Song XJ (2017) Ecological stoichiometric characteristics of plants, soil, and microbes of Pennisetum purpureum cv. Guimu-1 pastures at different rehabilitation ages in a karst rocky desertification region. Acta Ecol Sin 37:896–905 (in Chinese) Google Scholar
- Jiang YF, Guo X, Sun K, Rao L, Li J, Wang LK, Ye YC, Li WF (2017a) Spatial variability of farmland soil C:N ratio of Jiangxi Province. Environ Sci 38:3840–3850 (in Chinese)Google Scholar
- Jiang YF, Ye YC, Guo X, Rao L, Sun K, Li WF (2017b) Spatial variability of ecological stoichiometry of soil nitrogen and phosphorus in farmlands of Jiangxi province and its influencing factors. Acta Pedol Sin 54:1527–1539 (in Chinese)Google Scholar
- Li Y, Wu JS, Liu SL, Shen JL, Huang DY, Su YR, Wei WX, Syers JK (2012) Is the C:N:P stoichiometry in soil and soil microbial biomass related to the landscape and land use in southern subtropical China? Glob Biogeochem Cycles 337:1–14Google Scholar
- Li DW, Wang ZQ, Tian HX, He WX, Geng ZC (2017) Carbon, nitrogen and phosphorus contents in soils on Taibai Mountain and their ecological stoichiometry relative to elevation. Acta Pedol Sin 54:160–170 (in Chinese) Google Scholar
- Redfield AC (1958) The biological control of chemical factors in the environment. Am Scientist 46:205–221Google Scholar
- Zeng DH, Chen GS (2005) Ecological stoichiometry: a science to explore the complexity of living systems. Acta Phytoecologica Sinica 29:1007–1019Google Scholar
- Zhang GL, Gong ZT (2012) Soil survey laboratory methods. Science Press, Beijing (in Chinese)Google Scholar
- Zhang ZS, Lu XG, Xue ZS, Liu XH (2016) Is there a Redfield-type C:N:P ratio in Chinese wetland soils? Acta Pedol Sin 53:1160–1169 (in Chinese)Google Scholar
- Zhang H, Ouyang ZC, Zhao XM, Guo X, Kuang LH, Ye YC (2018) Effects of different land use types on soil organic carbon, nitrogen and ratio of carbon to nitrogen in the plow layer of farmland soil in Jiangxi Province. Acta Sci Circumst 38:2486–2497 (in Chinese)Google Scholar
- Zhao WJ, Liu XD, Jin M, Zhang XL, Che ZX, Jing WM, Wang SL, Niu Y, Qi P, Li WJ (2016) Ecological stoichiometric characteristics of carbon, nitrogen and phosphorus in leaf-litter-soil system of picea crassifolia forest in the Qilian Mountains. Acta Pedol Sin 53:477–489 (in Chinese) Google Scholar