Agricultural and Biological Sciences
8 years ago

Cultivating black soil may increase heavy metal mobility, impacting environment.

Soil Research
Effect of long-term cultivation on soil organic carbon fractions and metal distribution in humic and fulvic acid in black soil, Northeast China
Cen Sun, J. S. Liu, Yong-Ran Wang, Na Zheng, Xiaohu Wu, Qian Liu

Paper Summary

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Cultivating soil for a long time affects the amount and type of carbon and metals in the soil. In this study, researchers looked at how humic acid (HA) and fulvic acid (FA) change with cultivation in black soil in Northeast China. They found that after 200 years of cultivation, the amount of carbon in the soil decreased by 30%. HA decreased by 38% and FA decreased by 7%. The organic matter in cultivated soil was less mature compared to uncultivated soil. Fulvic acid had a strong attraction to lead (Pb) and zinc (Zn), while humic acid had more copper (Cu). As cultivation time increased, the amount of Cu and Zn bound to humic acid decreased, potentially making these metals more mobile in the soil.