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Outline
In this study, five treatments (CK: control with no Pb input, Pb30:30mg/kg soil, Pb60:60mg/kg soil, Pb120:120mg/kg soil, Pb240:240mg/kg soil) were set up by adding PbCl2 solution withdifferent Pb concentrations to atypical subtropical urban park soil. The indoor incubation experiments were carried out for 28d to investigate the response mechanism of potential N2O emissions from urban park soilto different exogenous Pb additions. The results showed that the cumulative N2O emissions from Pb30~Pb240 treatments were significantly higher than those from CK, which increased linearly with the increases of exogenous Pb additions and soil Pb contents, during the whole incubation period. After 14d of Pb addition, the activities of nitrite reductase and N2O reductase increased and decreased with the increasing soil Pb content, respectively, which resulted in significant increases in the potential N2O emission ratesfrom soil. After 14~28d of Pb addition, soil pH significantly decreased with the increasing soil Pb content, and the combined inhibitory effects of decreasing pH and increasing Pb content on the N2O reductase activity were significantly enhanced. The combined effects of the above-mentionedprocesses ultimately resulted in significant increases in the potential N2O cumulative emissionsfrom soilwith increasing Pb additions during the incubation period. This study indicates that the effects of Pb pollutants on nitrogen cycle and denitrification microorganisms should be paid more attention in the future, considering the accumulations of Pb pollutants in urban park soil will increase the risk of potential N2O emission. This study can provide scientific guidance for management of urban park and formulating measures for the reduction of N2O emissions from urban park soil.
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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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