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对茶园及相邻林地土壤N2O排放的垂直分布特征进行研究.结果表明:在0~100 cm土层,茶园和林地土壤全氮(TN)、N2O排放速率及积累量均随着土层增加而减少,且茶园均值大于林地.土壤pH、TN、水溶性有机氮(WSON)、微生物生物量氮(MBN)、NO3--N及NH4+-N含量随着土层增加总体呈下降趋势,茶园各土层TN、WSON、MBN、NO3--N及NH4+-N含量显著大于林地,而不同土层pH值均小于林地.茶园和林地土壤N2O排放速率与TN、MBN及NH4+-N含量呈显著正相关,而与pH相关性不显著.茶园土壤N2O排放速率与NO3--N含量的相关性显著,与WSON的相关性不显著,而在林地土壤中呈相反趋势.0~100 cm土层内茶园WSON/SON和N2O-N/MBN平均值大于林地,而MBN/SON平均值小于林地.这表明茶园土壤氮库有较高的代谢效率,N2O排放速率较高,不利于土壤氮库的储量积累,也不利于维持土壤质量和持续利用的潜力.
The vertical distribution characteristics of soil N2O emission in the tea plantation and adjacent forest were studied.The results showed that in the 0 ~ 100 cm soil layer, the total nitrogen (TN), N2O emission rate and accumulation in tea plantation and woodland increased with the increase of soil layer , And the mean value of tea plantation was greater than that of woodland.The contents of soil pH, TN, WSON, MBN, NO3 - N and NH4 + -N decreased with the increase of soil layers, The contents of TN, WSON, MBN, NO3 - N and NH4 + -N in soil were significantly higher than those in forestland, while the pH values in different soil layers were less than those in forestland. The N2O emission rates and TN, MBN and NH4 + But no significant correlation with pH.The correlation between N2O emission rate and NO3 - N content was significant in tea plantation soil, but not significant with WSON, but opposite in woodland soil. The mean values of WSON / SON and N2O-N / MBN in tea plantation were higher than that of woodland, while the average value of MBN / SON was less than that in woodland, which indicated that the nitrogen pool in tea plantation had higher metabolic efficiency and higher N2O emission rate, Accumulation, is not conducive to maintaining the potential of soil quality and sustainable use.