NO3--N Concentration and Net Nitrification Rate in Tea Soils

HAN Wen-yan; XU Jian-ming

doi:10.13305/j.cnki.jts.2011.06.013

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Journal of Tea Science ›› 2011, Vol. 31 ›› Issue (6) : 513-520. DOI: 10.13305/j.cnki.jts.2011.06.013

NO₃^--N Concentration and Net Nitrification Rate in Tea Soils

HAN Wen-yan^1,2, XU Jian-ming^1*

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Abstract

An investigation of NO₃^--N concentration and net nitrification rate in 130 tea soil samples was conducted. The net nitrification rate was measured by laboratory incubation method. The results showed that the NO₃^--N concentration ranged from 0 to 286.8mg/kg with a mean of 41.7mg/kg. Among all the samples, 40.8% of the soils were less than 20mg/kg in NO₃^--N concentration. Soil NO₃^--N concentration had a significant relationship with N application rate, but no obvious relation with soil net nitrification rate. A quadratic equation Y=738.0-289.9X+28.8X²（r²=0.2033, P<0.001） was established between NO₃^--N concentration (Y) and pH (X). Soil net nitrification rate ranged from -6.08 to 6.54 with a mean of 1.62mg/kg·d, and coefficient of variation (CV) was as high as 119%. 10% of the soil samples were below 0 in net nitrification rate, indicating net immobilization of nitrate happened in these soils. Net nitrification rate was positively and significantly related with N application rate. And an inverse function Y=10.14-33.96/X（r²=0.253, P<0.001）was found between net nitrification rate (Y) and soil pH (X). Why nitrate accumulated in tea soils and relationship between nitrification and pH was discussed.

Key words

net nitrification rate / nitrate concentration / pH / soil / tea

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HAN Wen-yan, XU Jian-ming. NO₃^--N Concentration and Net Nitrification Rate in Tea Soils[J]. Journal of Tea Science. 2011, 31(6): 513-520 https://doi.org/10.13305/j.cnki.jts.2011.06.013

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