欢迎访问《茶叶科学》,今天是

茶叶科学 ›› 2011, Vol. 31 ›› Issue (6): 513-520.doi: 10.13305/j.cnki.jts.2011.06.013

• • 上一篇    下一篇

茶园土壤NO3--N含量与净硝化速率的研究

韩文炎1,2, 徐建明1*   

  1. 1. 浙江大学土水资源与环境研究所,浙江 杭州 310058;
    2. 中国农业科学院茶叶研究所,浙江 杭州 310008
  • 收稿日期:2011-08-18 修回日期:2011-09-09 出版日期:2011-12-15 发布日期:2019-09-09
  • 通讯作者: jmxu@zju.edu.cn
  • 作者简介:韩文炎(1963— )男,浙江嵊州人,在读博士研究生,主要从事茶园土壤和肥料研究。
  • 基金资助:
    国家自然科学基金(40771113)、科技部支撑计划项目(2011BAD01B02)、国家973项目课题(2011CB100502)

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

HAN Wen-yan1,2, XU Jian-ming1*   

  1. 1. Institute of Soil and Water Resources and Environmental Science, Zhejiang University, Hangzhou 310058, China;
    2. Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China
  • Received:2011-08-18 Revised:2011-09-09 Online:2011-12-15 Published:2019-09-09

摘要: 调查采集了我国130个茶园的土壤,用0.5mol/L的K2SO4提取法和实验室恒温培养法分别测定了土壤NO3--N含量和净硝化速率。结果表明,茶园土壤NO3--N含量在0~286.8mg/kg之间,平均为41.7mg/kg,40.8%的土样低于20mg/kg;土壤NO3--N浓度的高低主要取决于施氮量,与土壤净硝化速率相关性不显著,与pH呈二次方程关系:Y=738.0-289.9X+28.8X2r2=0.2033,P<0.001)。土壤净硝化速率在-6.08~6.54mg/kg·d之间,平均为1.62mg/kg·d,变异系数高达119%;其中,10%的土壤净硝化速率低于零,表明这些土壤处于氮固定化状态中;土壤净硝化速率与施氮量呈显著正相关,与pH呈反函数方程关系:Y=10.14-33.96/Xr2=0.253,P<0.001)。文章对茶园土壤中NO3-积累、硝化作用与pH的关系等进行了讨论。

关键词: 茶, 土壤, pH, NO3-浓度, 净硝化速率

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+28.8X2r2=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/Xr2=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: tea, soil, pH, nitrate concentration, net nitrification rate

中图分类号: