Promotion of pH buffering capacity and immobilization of cadmium in three paddy soils by adding modified rice straw biochars

IF 2.3 4区农林科学 Q1 AGRONOMY

Archives of Agronomy and Soil Science Pub Date : 2023-03-22 DOI:10.1080/03650340.2023.2192490

Xian He, Ren-yong Shi, Jackson Nkoh Nkoh, Hong-Wei Lai, Peng Guan, Ke-wei Li, R. Xu

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引用次数: 0

Abstract

ABSTRACT To evaluate the effects of biochar on pH buffering capacity (pHBC) of paddy soils, rice straw biochar (RC) was modified by hydrogen peroxide (H2O2) and nitric acid/sulphuric acid (HNO3/H2SO4), respectively, and then added to the paddy soils developed from sandy Ultisol, clay Ultisol and granite Ultisol at the same proportion. After submerging and draining incubation, soil pHBC, soil pH and the available cadmium (Cd) extracted with calcium chloride were determined. The results indicated that the two modified biochars effectively promoted pHBC of three paddy soils and HNO3/H2SO4 modified biochar (HNO3/H2SO4-RC) led to greater increase in soil pHBC. Compared with control, HNO3/H2SO4-RC apparently increased pHBC of the paddy soils from sandy Ultisol, clay Ultisol and granite Ultisol by 32.7%, 37.4% and 25.3%, respectively. Correspondingly, soil pH increased by 1.59, 1.15 and 0.88 units, and the available Cd decreased by 74.1%, 67.5% and 75.0% in the paddy soils due to the incorporation of HNO3/H2SO4-RC. HNO3/H2SO4 modification significantly increased the carboxyl groups on the surface of RC. The dissociation of these functional groups produced a large number of organic anions, which could consume exogenous protons, and thus retarding the decline of soil pH and decreased soil available Cd.

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添加改性秸秆生物炭促进3种水稻土的pH缓冲能力和镉的固定化

摘要为评价生物炭对水稻土pH缓冲能力(pHBC)的影响，采用过氧化氢(H2O2)和硝酸/硫酸(HNO3/H2SO4)改性稻秆生物炭(RC)，并按相同比例添加到砂质、粘土和花岗岩Ultisol发育的水稻土中。通过浸没和排水培养，测定土壤pHBC、pH和氯化钙提取的有效镉(Cd)。结果表明，两种改性生物炭均能有效提高3种水稻土的pHBC，且HNO3/H2SO4改性生物炭(HNO3/H2SO4- rc)对土壤pHBC的提高作用更大。与对照相比，HNO3/H2SO4-RC可显著提高砂质、粘土和花岗岩型水田土的pHBC，分别提高32.7%、37.4%和25.3%。HNO3/H2SO4-RC的掺入使水稻土的pH分别升高1.59、1.15和0.88个单位，有效镉含量分别降低74.1%、67.5%和75.0%。HNO3/H2SO4改性显著增加了RC表面的羧基。这些官能团的解离产生了大量的有机阴离子，这些阴离子可以消耗外源质子，从而延缓了土壤pH的下降和土壤有效镉的降低。

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来源期刊

Archives of Agronomy and Soil Science AGRONOMY-SOIL SCIENCE

CiteScore

5.50

自引率

4.20%

发文量

107

期刊介绍： rchives of Agronomy and Soil Science is a well-established journal that has been in publication for over fifty years. The Journal publishes papers over the entire range of agronomy and soil science. Manuscripts involved in developing and testing hypotheses to understand casual relationships in the following areas: plant nutrition fertilizers manure soil tillage soil biotechnology and ecophysiology amelioration irrigation and drainage plant production on arable and grass land agroclimatology landscape formation and environmental management in rural regions management of natural and created wetland ecosystems bio-geochemical processes soil-plant-microbe interactions and rhizosphere processes soil morphology, classification, monitoring, heterogeneity and scales reuse of waste waters and biosolids of agri-industrial origin in soil are especially encouraged. As well as original contributions, the Journal also publishes current reviews.