Effects of ammonium-based nitrogen addition on soil nitrification and nitrogen gas emissions depend on fertilizer-induced changes in pH in a tea plantation soil
Effects of ammonium-based nitrogen addition on soil nitrification and nitrogen gas emissions depend on fertilizer-induced changes in pH in a tea plantation soil
复制标题
添加铵基氮对土壤硝化和氮气排放的影响取决于肥料引起的茶园土壤 pH 值的变化
DOI：
10.1016/j.scitotenv.2020.141340
复制
发表时间：
2020
影响因子：
9.8
通讯作者：
Chang Scott X.
中科院分区：
文献类型：
--
作者：
Wang Jing;Tu Xiaoshun;Zhang Huimin;Cui Jingya;Ni Kang;Chen Jinlin;Cheng Yi;Zhang Jinbo;Chang Scott X.
茶树 (Camellia sinensisL.) 的最佳 pH 范围为 4.5–6.0，并且更喜欢铵 (NH4+) 而不是硝酸盐 (NO3−)；因此，强烈的土壤酸化和硝化作用不利于它们的生长。施用NH4+基肥料可以增强硝化作用，并产生抑制硝化作用的H+。然而，茶园中不同的NH4+基肥料如何交互影响土壤酸化和硝化作用仍不清楚。本研究的目的是评估施用不同形式和用量的 NH4+ 基肥料对酸性茶园土壤 pH 值、净硝化率以及 N2O 和 NO 排放的影响。我们使用硫酸铵、尿素和碳酸氢铵在 0、100 或 200 mg N kg−1 土壤中施用，进行了 35 天的有氧培养实验。尿素和碳酸氢铵显着增加了土壤 pH 值和净硝化率，而硫酸铵不影响土壤 pH 值，但主要由于肥料的酸性性质而降低了净硝化率。我们发现不同NH4+基氮对土壤硝化作用的影响取决于肥料对土壤pH值的影响，硝化作用对NO排放起着重要作用，但对N2O排放没有影响。总体而言，尽管土壤 pH 值增加，但尿素和碳酸氢铵的施用使作物对氮的偏好和可用氮的形式脱钩。因此，我们建议茶园使用尿素肥料时配施尿素酶和硝化抑制剂，使用碳酸氢铵肥料时配施硝化抑制剂。
Tea (Camellia sinensisL.) plants have an optimal pH range of 4.5–6.0, and prefer ammonium (NH4+) over nitrate (NO3−); strong soil acidification and nitrification are thus detrimental to their growth. Application of NH4+-based fertilizers can enhance nitrification and produce H+that can inhibit nitrification. However, how soil acidification and nitrification are interactively affected by different NH4+-based fertilizers in tea plantations remains unclear. The objective of this research was to evaluate the effect of the application of different forms and rates of NH4+-based fertilizers on pH, net nitrification rates, and N2O and NO emissions in an acidic tea plantation soil. We conducted a 35-day aerobic incubation experiment using ammonium sulphate, urea and ammonium bicarbonate applied at 0, 100 or 200 mg N kg−1soil. Urea and ammonium bicarbonate significantly increased both soil pH and net nitrification rates, while ammonium sulphate did not affect soil pH but reduced net nitrification rates mainly due to the acidic nature of the fertilizer. We found that the effect of different NH4+-based nitrogen on soil nitrification depended on the impact of the fertilizers on soil pH, and nitrification played an important role in NO emissions, but not in N2O emissions. Overall, urea and ammonium bicarbonate application decoupled crop N preference and the form of N available in spite of increasing soil pH. We thus recommend the co-application of urease and nitrification inhibitors when urea is used as a fertilizer and nitrification inhibitors when ammonium bicarbonate is used as a fertilizer in tea plantations.