Sequence and preference in the use of electron acceptors in flooded agricultural soils

IF 2 4区农林科学 Q2 AGRONOMY

International Agrophysics Pub Date : 2021-03-15 DOI:10.31545/INTAGR/132372

T. Włodarczyk, M. Brzezińska, W. Stepniewski, U. Majewska, P. Szarlip, A. Księżopolska, M. Pazur

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引用次数: 3

Abstract

*Corresponding author e-mail: t.wlodarczyk@ipan.lublin.pl **The paper was partly financed by project No. NN310115338 sponsored by Ministry of Science in Poland (2010-2013). Ab s t r a c t. Specifically, it was tested whether the presence of O2 in the headspace modified the sequence and preference of electron acceptor use under hypoxic conditions after prolonged drought in arable soils. This laboratory study was conducted in order to examine the use of electron acceptors: oxygen (O2), nitrate (NO3 ̄) and nitrous oxide (N2O), during aerobic and anaerobic respiration (denitrification). Agricultural soils (Typic Dystrudepts) classified as sandy, silty and loamy soils from arable top soils (0-30 cm) were used in the study. The change of oxidation states of different chemical species in the soil affected the use of electron acceptors during denitrification. The use of O2, NO3 ̄ and net N2O use was gradual and differed greatly among the soils. Furthermore, microorganisms were shown to be able to use all three investigated electron acceptors simultaneously, but with clearly visible preferences. The rate of electron acceptor use per day differentiated the investigated soils into a few different groups. Overall, the results of this study indicated that N2O was a more preferable electron acceptor than NO3 ̄ when O2 was present in the headspace for the most investigated soils. Moreover, a correlation existed between the final electron acceptor use and particle-size distribution and the native organic C content (Corg). The rate of electron acceptor use per day calculated for O2, NO3 ̄ and N2O may provide very important information for distinguishing the preference of electron acceptor use during aerobic and nitrate respiration in agroecosystems under hypoxic conditions after prolonged drought for different kinds of electron acceptor. K e y w o r d s: electron acceptor use, N2O net use, O2 consumption, NO3 ̄ reduction, flooded soils after drought INTRODUCTION

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淹水农业土壤中电子受体使用的顺序和偏好

*通讯作者电子邮件：t.wlodarczyk@ipan.lublin.pl**该论文的部分资金来自波兰科学部赞助的项目NN310115338（2010-2013）。Ab s t r a c t。具体而言，测试了在耕地土壤长期干旱后，在缺氧条件下，顶部空间中O2的存在是否改变了电子受体使用的顺序和偏好。进行这项实验室研究是为了检查电子受体：氧（O2）、硝酸盐（NO3̄）和一氧化二氮（N2O）在有氧和厌氧呼吸（反硝化）过程中的使用。研究中使用了农业土壤（Typic Dystrudepts），从耕地表层土壤（0-30 cm）中分为沙质、粉质和壤土。土壤中不同化学物质氧化态的变化影响了反硝化过程中电子受体的使用。O2、NO3̄的使用和N2O的净使用是渐进的，不同土壤之间差异很大。此外，微生物被证明能够同时使用所有三种研究的电子受体，但具有明显可见的偏好。每天使用电子受体的速率将所研究的土壤分为几个不同的组。总的来说，这项研究的结果表明，当O2存在于大多数研究土壤的顶部空间时，N2O是比NO3更优选的电子受体。此外，最终电子受体的使用与颗粒尺寸分布和天然有机碳含量（Corg）之间存在相关性。根据O2、NO3̄和N2O每天计算的电子受体使用率，可以为区分不同类型的电子受体在长期干旱后缺氧条件下农业生态系统中有氧和硝酸盐呼吸过程中的电子受体偏好提供非常重要的信息。K e y w o r d s：电子受体使用、N2O净使用、O2消耗、NO3̄还原、干旱后淹水土壤简介

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来源期刊

International Agrophysics 农林科学-农艺学

CiteScore

3.60

自引率

9.10%

发文量

审稿时长

3 months

期刊介绍： The journal is focused on the soil-plant-atmosphere system. The journal publishes original research and review papers on any subject regarding soil, plant and atmosphere and the interface in between. Manuscripts on postharvest processing and quality of crops are also welcomed. Particularly the journal is focused on the following areas: implications of agricultural land use, soil management and climate change on production of biomass and renewable energy, soil structure, cycling of carbon, water, heat and nutrients, biota, greenhouse gases and environment, soil-plant-atmosphere continuum and ways of its regulation to increase efficiency of water, energy and chemicals in agriculture, postharvest management and processing of agricultural and horticultural products in relation to food quality and safety, mathematical modeling of physical processes affecting environment quality, plant production and postharvest processing, advances in sensors and communication devices to measure and collect information about physical conditions in agricultural and natural environments. Papers accepted in the International Agrophysics should reveal substantial novelty and include thoughtful physical, biological and chemical interpretation and accurate description of the methods used. All manuscripts are initially checked on topic suitability and linguistic quality.