kaz65Почвоведение и агрохимияSoil Science and Agrichemistry1999-740X2959-3433Казахский научно-исследовательский институт почвоведения и агрохимии имени У.У. Успановаkaz65-426Research ArticleSOIL BIOLOGY AND BIOCHEMISTRYEFFECT OF EXTERNAL AND INTERNAL NITROGEN ON MINERALIZATION RATE OF CORN RESIDUESAnnaK. Kvitkinanoemail@neicon.ruAllaA. Larionovaaqvia@mail.ruSergeiS. Bykhovetsnoemail@neicon.ruInstitute of Physicochemical and Biological Problems in Soil Science of RAS (IPCBPSS RAS)Kazakhstan201407112022043139Copyright © Anna K.K., Alla A.L., Sergei S.B., 20222022Anna K.K., Alla A.L., Sergei S.B.Anna K.K., Alla A.L., Sergei S.B.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://journal.soil.kz/jour/article/view/426

Влияние внешнего и внутреннего азота на разложение растительных остатков было изучено в ходе серии долгосрочных лабораторных экспериментов инкубации. Эксперимент А проводили с листьями кукурузы с переменным соотношением C:N -22, 34, 47 и 62. Коэффициенты C:N в экспериментах В и С доводили до 47, 32, 22 и 10, путем добавления NH4NO3 (эксперимент Б) или KNO3 (эксперимент C) в остатки кукурузы с исходным соотношением C:N 62. Уровень минерализации лабильных и устойчивых углеродных резервов растительных остатков оценивались при помощи кинетики кумулятивных потерь CO2 в течение однолетней инкубации, моделируемой с помощью функции двойного экспоненциального распада. Внутренний органический азот показал, что влияет только на константу распада лабильного резерва, в то время как внутренний неорганический N влияет также на размер лабильного резерва. Кроме того, KNO3 в качестве внешней формы N влиял как на значение k, так и на размер лабильного резерва. NH4NO3 повлиял на все параметры модели двойного экспоненциального распада, в том числе второй константы распада (k) устойчивого слоя. Таким образом, минерализация растительных остатков в значительной степени зависит как от концентрации так и от формы доступного азота.

The impact of external and internal nitrogen on plant residues decomposition was studied in a series of long-term laboratory incubation experiments. Experiment A was conducted with corn leaves with variable C:N ratios 22, 34, 47 and 62. C:N ratios in Experiments B and C were adjusted to 47, 32, 22 and 10 by adding NH4NO3 (Experiment B) or KNO3 (Experiment C) to corn residues with initial &N ratio of 62. Mineralization rates of labile and recalcitrant carbon pools of plant residues were estimated by kinetics of cumulative CO losses during one-year-long incubation simulated by the double exponential decay function. The internal organic nitrogen was shown to effect the decay constant of the labile pool only, while the internal inorganic N had impact on the labile pool size as well. Also, KNO3 as an external N form influenced both k value and the labile pool size. NH4NO3 affected all the parameters of the double exponential decay model including second decay constant (k ) of recalcitrant pool. Thus, mineralization of plant residues depends significantly both on concentration and form of available nitrogen.

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