Changes of available cadmium and organic carbon in cadmium contaminated paddy soil through application of iron-based biochar

doi:10.14088/j.cnki.issn0439-8114.2024.07.007

Abstract

Abstract: In order to meet the practical needs of reducing pollution and fixing carbon in cadmium polluted rice fields, iron-based biochar was selected as the research object. Through field experiments, soil and rice grain samples were collected, and the soil available cadmium contents, organic carbon contents, and rice grain cadmium concentrations and their correlation were analyzed. The results showed that compared to the control, iron-based biochar reduced the effective cadmium content in paddy soil by 11.98%~28.71%, increased soil organic carbon content by 3.66%~12.88%, and reduced the cadmium content in rice grains by 4.16%~63.58%. There was a highly significant negative correlation （P<0.01） between soil available cadmium and organic carbon content, and a highly significant positive correlation （P<0.01） between soil available cadmium and rice grain cadmium content. Therefore, iron-based biochar was beneficial for achieving cadmium reduction and carbon sequestration in rice fields contaminated with cadmium.

Key words: iron-based biochar, paddy soil, soil available cadmium, rice grain cadmium, organic carbon

CLC Number:

LI Ting-ting, ZHENG Fu-hai, ZHANG Jun-hui, YU Yue-feng, HU Jun-ming, LIANG Gan-ming, LIN Yong-chang, HUANG Liu-ying. Changes of available cadmium and organic carbon in cadmium contaminated paddy soil through application of iron-based biochar[J]. HUBEI AGRICULTURAL SCIENCES, 2024, 63(7): 48-52.

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