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To explore the winter wheat-soil carbon (C) and nitrogen (N) stoichiometry, we measured the concentrations of C and N in different winter wheat organs (e.g. leaf, stem and grain) and soil, as well as their response to elevated CO2. This study was conducted at the long-term free air carbon dioxide enrichment platform (FACE) in Changping, Beijing. Two CO2 concentration treatments were conducted, which were ambient CO2 (aCO2： 400 μmol·mol-1) treatment and elevated CO2 (eCO2： 550 μmol·mol-1) treatment. Results showed that the responses of wheat and soil C and N stoichiometry to elevated CO2 differed. The leaf, stem and grain C and N stoichiometry were not affected by elevated CO2. However, the soil total carbon (TC) content significantly increased in response to eCO2 treatment, while the total nitrogen (TN) content and the TC∶TN ratio remained unchanged. In comparison to elevated CO2 treatment, the winter wheat and soil C and N stoichiometry showed greater sensitivity to changes in crop stages. The C∶N ratio of leaf and stem increased from the jointing stage to the maturity stage, while the grain C∶N ratio decreased from the filling stage to the maturity stage. The homeostasis of the C element was higher than that of the N element in winter wheat. There were differences in the homeostasis of winter wheat organs, with the grain showing a higher level compared to the leaf and stem. Under aCO2 treatment, the correlation between soil and winter wheat leaf and stem C and N stoichiometry was significant. However, the strong correlation between soil and winter wheat C and N stoichiometry was no longer exist or weakened under eCO2 treatment. These findings indicated that future climate change might enhance the obscure of the relationship between aboveground and belowground.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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