养殖肥液不同灌溉强度下硝化-脲酶抑制剂-生物炭联合阻控氮淋溶的研究

Nitrification-urease inhibitor-biochar-controlled nitrogen leaching with different biogas slurry irrigation intensities

为考察养殖肥液不同灌溉强度下,硝化-脲酶抑制剂-生物炭技术(Nitrapyrin+NBPT+Biochar)对氮素淋失的抑制效果,本研究采用土柱模拟淋溶试验,测定淋溶液中铵态氮(NH4^+-N)、硝态氮(NO3^--N)、总氮(TN)的浓度以及土壤中NH4^+-N、NO3^--N的含量,探究养殖肥液不同灌溉强度下Nitrapyrin+NBPT+Biochar技术对氮素淋失的影响。结果表明:硝化-脲酶抑制剂-生物炭阻控技术使淋溶液中NH4^+-N、NO3^--N、TN浓度降低了25.3%、53.6%、38.2%,累积淋失量减少了34.5%、61.0%、38.6%。该技术在灌溉强度增加30.0%、60.0%和100.0%后,仍使NO3^--N淋失量减少了59.3%、55.1%、46.6%,TN淋失量减少了31.7%、27.1%、15.4%,土壤NH4^+-N增加86.5%、60.0%、44.5%。该研究中养殖肥液灌溉强度越大土壤氮素淋失风险越大,但是硝化-脲酶抑制剂-生物炭技术明显抑制了氮素淋失,并且在增加一定灌水量范围内仍然有效果。

To investigate the effect of nitrapyrin+NBPT+biochar on nitrogen leaching under different biogas slurry irrigation intensities,this study used a soil column simulated leaching test.The ammonium nitrogen(NH4^+-N),nitrate nitrogen(NO3^--N),and total nitrogen(TN)contents in the soil leaching solution and the contents of NH4^+-N and NO3^--N in the soil were monitored.The results showed that the nitrapyrin+NBPT+biochar reduced the concentrations of NH4^+-N,NO3^--N,and TN in the soil leaching solution by 25.3%,53.6%,and 38.2%,respectively,and reduced the cumulative leaching loss by 34.5%,61.0%,38.6%,respectively;and after the irrigation intensity increased by 30.0%,60.0%,and 100.0%,the technology still reduced the NO3^--N leaching volume by 59.3%,55.1%,and 46.6%,respectively,and the TN leaching volume by 31.7%,27.1%,and 15.4%,respectively.The soil NH4^+-N content increased by 86.5%,60.0%,and 44.5%,respectively.In this study,the greater the intensity of biogas slurry irrigation,the greater the risk of soil nitrogen leaching.However,the nitrapyrin+NBPT+biochar significantly inhibited nitrogen leaching and still had an effect within a certain range of increasing irrigation.