Changes in Soil Iron Fractions and Availability in the Loess Belt of Northern China After 28 Years of Continuous Cultivation and Fertilization

CHEN Xu; WEI Xiaorong; HAO Mingde; ZHAO Jing

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Changes in Soil Iron Fractions and Availability in the Loess Belt of Northern China After 28 Years of Continuous Cultivation and Fertilization

机译：北方黄土区连作28年的土壤铁形态和有效性变化。

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Iron (Fe) deficiency in calcareous soils of the Loess Plateau of China is a wide spread issue and primarily affects agricultural production due to the relatively higher soil pH and carbonate content.Understanding the relationships between Fe distribution in soil fractions,Fe availability,and their responses to cropping and fertilization could provide essential information for assessing Fe availability in soils and managing soils to improve Fe availability.A long-term field experiment was established in 1984 in a split-plot design using cropping systems as main plots and fertilizer treatments as subplots on a farmland in the Loess Plateau.The croppingsystems included fallow,continuous wheat cropping,continuous alfalfa cropping,continuous maize cropping,and a rotation system that included a legume.Various fertilization treatments using chemical and/or manure fertilizers were included in each cropping system.Soil samples were collected from 0-10 and 20-40 cm depths in 2012.Long-term planting of crops significantly increased the concentrations of available Fe in the soils.The largest increase was observed in the continuous alfalfa cropping system.Long-term cropping significantly increased the concentrations of Fe associated with carbonates and organic matter,but decreased the concentration of Fe associatedwith minerals in the soils.The effect of fertilization on the distribution of Fe in the soil fractions varied with cropping system and soil depth.The fertilization treatment with manure generally increased the concentrations of Fe associated with the soil fractions.Long-term cropping and fertilization in the highland farmland significantly affected the availability of Fe and the distribution of Fe fractions in the soil.

机译：黄土高原石灰性土壤中的铁（Fe）缺乏是一个广泛传播的问题，由于土壤pH值和碳酸盐含量相对较高，主要影响农业生产。了解土壤组分中Fe的分布，Fe有效性及其与它们之间的关系。种植和施肥的反应可以为评估土壤中铁的有效性和管理土壤以提高铁的有效性提供重要信息。1984年，在以分田设计为主要田地并以化肥处理为亚地块的情况下，进行了长期田间试验。在黄土高原的一片农田上。种植系统包括休耕，小麦连续种植，苜蓿连续种植，玉米连续种植以及包括豆类的轮作系统。每种种植系统都包括使用化学肥料和/或肥料的各种施肥处理。 2012年从0-10厘米和20-40厘米深度采集土壤样品。作物的种植显着增加了土壤中有效铁的含量。在连续苜蓿种植体系中增幅最大。长期种植显着增加了碳酸盐和有机质相关的铁含量，但降低了与碳酸盐和有机质相关的铁含量。施肥对土壤组分中Fe分布的影响随耕作制度和土壤深度的变化而变化。肥料施肥处理通常会增加与土壤组分相关的Fe的浓度。高地农田严重影响了土壤中铁的有效性和铁含量的分布。

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《土壤圈（英文版）》 |2019年第1期|123-131|共9页
作者
CHEN Xu; WEI Xiaorong; HAO Mingde; ZHAO Jing;
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作者单位

College of Natural Resources and Environment, Northwest Agriculture and Forestry University, Yangling 712100 China;

Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081 China;

College of Natural Resources and Environment, Northwest Agriculture and Forestry University, Yangling 712100 China;

Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100 China;

College of Natural Resources and Environment, Northwest Agriculture and Forestry University, Yangling 712100 China;

Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100 China;

College of Natural Resources and Environment, Northwest Agriculture and Forestry University, Yangling 712100 China;

Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100 China;

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Changes in Soil Iron Fractions and Availability in the Loess Belt of Northern China After 28 Years of Continuous Cultivation and Fertilization

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