Soil Cd increased the leaf litter Cd remains of Solanum nigrum and Solanum lycopersicum.

Autor: Chen Q; School of Life Sciences, Nanjing University, Nanjing, 210023, China., Feng Y; School of Life Sciences, Nanjing University, Nanjing, 210023, China., Ran Z; School of Life Sciences, Nanjing University, Nanjing, 210023, China., Zhou Z; School of Life Sciences, Nanjing University, Nanjing, 210023, China., Li Q; School of Life Sciences, Nanjing University, Nanjing, 210023, China., Luo Y; School of Life Sciences, Shanxi Normal University, Taiyuan, 030031, China., Cai S; School of Life Sciences, Nanjing University, Nanjing, 210023, China., Chen S; School of Life Sciences, Nanjing University, Nanjing, 210023, China., Yang J; Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin, 541006, China., Tian X; School of Life Sciences, Nanjing University, Nanjing, 210023, China; School of Ecological and Environmental Engineering, Qinghai University, Xining, 810016, China. Electronic address: tianxj@nju.edu.cn.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2024 Apr 15; Vol. 347, pp. 123703. Date of Electronic Publication: 2024 Mar 03.
DOI: 10.1016/j.envpol.2024.123703
Abstrakt: Plant litter decomposition is a natural pathway of heavy metal cycling in soil ecosystems, but the dynamics of heavy metal release during litter decomposition are relatively poorly understood. The purpose of this study was to investigate the effects of species, soil fauna and soil Cd addition on litter decomposition and Cd release dynamics. Therefore, we selected two plants, Solanum nigrum and S. lycopersicum with large differences in Cd accumulation capacity. First, they were enriched with Cd during the growing period and leaf litter was harvested after 6 months of pretreatment. Then, the decomposition of leaf litter was conducted with or without soil Cd and Eisenia fetida through lab pot tests. Our results showed that leaf litter Cd led to a significant decrease in litter decomposition rate (K value), with a maximum decrease of 32.1% in S. nigrum and 30.1% in S. lycopersicum. We observed that the presence of E. fetida significantly increased K value, but the effect was similar in the +leaf Cd treatment and the -leaf Cd treatment, both for S. nigrum and S. lycopersicum. Interestingly, the litter Cd concentration did not decrease during decomposition, but showed an increasing trend, especially for S. nigrum in the +soil Cd treatment. Moreover, the litter Cd remains was higher in the +soil Cd treatment compared to the -soil Cd treatment for both S. nigrum and S. lycopersicum, no matter whether with or without E. fetida. This result suggests that the Cd may be transferred from soil to litter, thus increasing the litter Cd remains. Overall, our study shows that leaf litter Cd slowed down the carbon cycling in ecosystems. In addition, the release of litter Cd has a lag, and the litter has a certain adsorption capacity for soil Cd, which intensifies the harm to the ecology during litter transfer.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Xingjun Tian reports financial support was provided by the National Key Research and Development Program of China. Xingjun Tian reports financial support was provided by the National Natural Science Foundation of China. Xingjun Tian reports financial support was provided by Jiangsu Forestry Science and Technology Innovation and Promotion Project. Xingjun Tian reports financial support was provided by Strategic Priority Research Program of the Chinese Academy of Sciences (A). If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Databáze: MEDLINE
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