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茶园及相邻林地土壤N2O排放的垂直分布特征

范利超,韩文炎**,李鑫,李治鑫   

  1. (中国农业科学院茶叶研究所, 杭州 310008)
  • 出版日期:2015-09-18 发布日期:2015-09-18

Vertical distribution characteristics of N2O emission in tea garden and its adjacent woodland.

FAN Li-chao, HAN Wen-yan, LI Xin, LI Zhi-xin   

  1. (Tea Research Institute, Chinese Academy of Agricultural Science, Hangzhou 310008, China)
  • Online:2015-09-18 Published:2015-09-18

摘要: 对茶园及相邻林地土壤N2O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.

Abstract: In this study, we determined the vertical distribution of N2O emission rates in tea soils and its adjacent woodland soils. The results showed that total nitrogen contents, N2O fluxes and cumulative emissions in the tea garden and woodland decreased with the increasing depth of the soil layer, and their average values were greater in tea garden than in woodland. Generally, pH, soil water soluble organic nitrogen (WSON), soil microbial biomass nitrogen (MBN),  NO3--N and NH4+-N contents had a downward trend with the increasing depth of soil layer. The WSON, MBN, NO3--N and NH4+-N contents from each soil layer were greater in tea garden than in woodland, but the pH value in tea garden was lower than that in woodland. The N2O emission rate was significantly positively related with TN, MBN and NH4+-N contents, but not with pH value. The N2O emission rate was significantly correlated with WSON content in woodland, but not in tea garden. The N2O emission rate was significantly correlated with NO3--N concentration in tea garden, but not in woodland. WSON/TN and N2ON/SMBN were averagely greater than in tea garden in woodland, and SMBN/TN was opposite. These results indicated that tea soil was not conducive to accumulate nitrogen pool, maintain soil quality and its sustainable use compared to woodland.