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通过室内培养实验,研究了自然状态(对照)、外源铵态氮(NH_4Cl)和硝态氮(KNO_3)的3种浓度输入(1 g/m~2、2 g/m~2和4 g/m~2氮)和互花米草入侵下,闽江河口短叶茳芏(Cyperus malaccensis)潮滩土壤甲烷氧化速率。结果表明,与自然状态下相比,总体上,氨态氮输入促进了短叶茳芏潮滩土壤甲烷氧化,且随着氮输入浓度的增加,其促进作用逐渐增大;而硝态氮输入却抑制了短叶茳芏潮滩土壤的甲烷氧化,输入的硝态氮浓度越高,甲烷氧化速率越小;氮输入对潮滩土壤甲烷氧化速率无显著影响。互花米草(Spartina alterniflora)潮滩土壤的甲烷氧化速率高于短叶茳芏潮滩,互花米草入侵使潮滩土壤的甲烷氧化速率增加了22.66%。低、高浓度氮输入与互花米草入侵共同作用促进了潮滩土壤甲烷氧化,而中浓度氮输入与互花米草入侵共同作用却抑制了潮滩土壤甲烷氧化。潮滩土壤甲烷氧化速率与输入氮的类型、浓度、培养时间和土壤类型等有关。
The effects of natural conditions (control), exogenous ammonium nitrogen (NH_4Cl) and nitrate nitrogen (KNO_3) concentration (1 g / m ~ 2, 2 g / m ~ 2 and 4 g / m ~ 2 nitrogen and Spartina alterniflora, the methane oxidation rate in the tidal flat of Cyperus malaccensis in Minjiang estuary. The results showed that, compared with the natural state, the input of ammonia nitrogen promoted the methane oxidation in the tideland of Tamarix ramosissima, and the promoting effect increased with the increase of nitrogen input concentration. However, the input of nitrate nitrogen But inhibited the methane oxidation in the soil of the tideland wetland. The higher the input nitrate concentration, the lower the methane oxidation rate. The nitrogen input had no significant effect on the methane oxidation rate in the tidal flat soil. The methane oxidation rate of Spartina alterniflora tidal flat was higher than that of the short-tailed logarithmic tidal flat. Spartina alterniflora invasion increased the methane oxidation rate of tidal flat soil by 22.66%. The combination of low and high concentrations of nitrogen and Spartina alterniflora promoted the methane oxidation in tidal flat soil. However, the combination of medium and low concentrations of nitrogen and Spartina alterniflora intrusion inhibited the methane oxidation in tidal flat. Methane oxidation rates in tidal flat soil are related to the type, concentration, incubation time and soil type of input nitrogen.