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Changes in organic carbon content and its physical and chemical distribution in paddy soils cultivated under different fertilisation practices

文献类型： 外文期刊

作者： Wei, Zongqiang 1 ; Ji, Jianhua 2 ; Li, Zhi 3 ; Yan, Xiao 1 ;

作者机构： 1.Jiangxi Agr Univ, Sch Environm & Land Resource Management, Nanchang 330045, Jiangxi, Peoples R China

2.Jiangxi Acad Agr Sci, Soil & Fertiliser Resources & Environm Inst, Nanchang 330200, Jiangxi, Peoples R China

3.Jiangxi Normal Univ, Coll City Construct, Nanchang 330022, Jiangxi, Peoples R China

关键词： Amorphous Fe and Al;Chemical protection;Paddy soil;Particle size fractions;Soil carbon stabilisation

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.308； 五年影响因子：3.586 ）

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收录情况： SCI

摘要： Purpose Chemical protection facilitates soil organic carbon (SOC) sequestration and stabilisation due to a strong chemical binding with mineral surfaces and metal ions (e.g. iron [Fe], aluminium [Al] and calcium [Ca]). However, there is not much information regarding the role of chemical protection in SOC stabilisation in paddy soils, particularly in terms of the specific forms of organo-mineral complexes such as Fe-, Al- and Ca-bonded OC. Materials and methods We sampled paddy soils at the 0-20 cm soil layer from a long-term field experiment (initiated in 1981) conducted under humid subtropical conditions in China, which has five fertilisation treatments (i.e. control treatment without fertiliser [CK], chemical fertiliser only [CF], green manure [GM], Straw and Manure) with equivalent nutrient inputs (i.e. N, P2O5 and K2O at the rates of 135-67.5-135 kg ha(-1), respectively, for both early and late rice) except CK. We determined the chemical binding forms of SOC and the associated soil properties in the particulate fraction (PF, > 53 mu m) and the mineral-associated fraction (MAF, < 53 mu m), which were obtained using a low-energy ultrasonic dispersion procedure, of a paddy soil in the long-term fertilisation experiment.

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