论文部分内容阅读
以黄河口生态恢复前后未恢复区(R_0)、2007年恢复区(R_(2007))和2002年恢复区(R_(2002))的芦苇湿地为研究对象,研究了不同形态氮输入对湿地土壤N_2O产生过程的影响与贡献.结果表明:硝态氮(NO_3~--N)输入对恢复区湿地土壤N_2O总产生量的影响远远大于铵态氮(NH_4~+-N),但两者均抑制了R_0土壤的N_2O总产生量.尽管NO_3~--N输入对R_(2002)表层土壤N_2O总产生量的影响明显大于R_(2007),但二者的N_2O产生量均随氮输入量的增加而增加.恢复区湿地土壤的反硝化作用和硝化细菌反硝化作用受NO_3~--N输入的影响明显,而R_0土壤产生N_2O的生物过程受其影响并不显著.尽管NH_4~+-N输入对湿地土壤N_2O的总产生量影响不大,但其输入整体促进了R_0土壤的硝化细菌反硝化作用、R_(2007)土壤的硝化作用和R_(2002)土壤的非生物作用.比较而言,NO_3~--N输入对R_0、R_(2007)和R_(2002)湿地土壤N_2O产生的非生物作用主要表现为抑制,NH_4~+-N输入则整体提高了R_0和R_(2002)湿地土壤非生物作用的N_2O产生量,这与不同形态氮输入对土壤p H的调节作用密切相关.研究发现,NO_3~--N输入大大增加了湿地土壤的N_2O总产生量,改变了原有湿地土壤生物作用和非生物作用的贡献模式,故生态恢复工程导致的营养盐输入(NO_3~--N)应受到特别关注.
The effects of different forms of nitrogen input on wetland soils, wetland soils, and soils were studied in the unrecovery area (R_0), the 2007 restoration area (2007) and the 2002 restoration area (2002) of the Yellow River Estuary. N 2 O production process.The results showed that the input of nitrate nitrogen (NO 3 - -N) had a greater effect on the total N 2 O production in the wetland soils than that of ammonium nitrogen (NH 4 + -N) All inhibited the total N_2O production in R_0 soil.Although the effect of NO_3 ~ - N input on the total N_2O production of surface soil in R_ (2002) was significantly greater than that of R_ (2007), the N_2O production of both N_2O and N_2O increased with nitrogen input The denitrification and denitrification of nitrifiers were affected by NO_3 ~ - N input in wetland soils, and the biological process of N_2O production in R_0 soils was not significant.Although NH_4 ~ + - N input had little effect on the total N2O production in wetland soil, but its input promoted denitrification of R_0 soil in general, nitrification of R_ (2007) soil and abiotic activity of R_ (2002) soil. The main non-biological effects of NO_3 ~ - N input on N_2O production in wetland soils R_0, R_ (2007) and R_ (2002) The results showed that NH_4 ~ + -N input increased the non-biological N_2O production in R_0 and R_ (2002) wetlands as a whole, which was closely related to the regulation of soil p H by different forms of nitrogen.It was found that NO_3 ~ - N input greatly increased the total N2O production of wetland soils and changed the contribution mode of biological and non-biological effects of the original wetland so the nutrient input (NO3 ~ - N) caused by ecological restoration project should be affected Special attention.