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Rhizosphere dissolved organic matter and iron plaque modified by organic amendments and its relations to cadmium bioavailability and accumulation in rice.
Sci Total Environ. 2021 Oct 20; 792:148216.ST

Abstract

Organic amendments can modify rhizosphere dissolved organic matter (DOM) properties and Fe-plaque quantity, thereby affecting cadmium (Cd) bioavailability and uptake by rice. Pot experiments were conducted to investigate effects of biochar (BC) and vermicompost (VC) at different rates (0, 1%, and 5%) on rhizosphere DOM characteristics and Fe-plaque quantity, and their impacts on Cd bioavailability and accumulation in high and low Cd-accumulation rice cultivars (HAC and LAC). Soil DOM was characterized by ultraviolet-visible (UV-Vis) and fluorescence excitation-emission matrix (EEM) spectrum analyses. Hydroponic experiments were conducted to investigate effects of BC- or VC-derived DOM combined Fe-plaque on Cd uptake by rice. Results showed that increasing rates of organic amendments increased DOM concentration while decreased Cd availability in rhizosphere and bulk soils and Cd contents in rice tissues. The Cd reduction in LAC grains (31.9%-72.7%) was better than that in HAC grains (6.3%-25.4%) after organic amendment addition. Soil DOM properties were modified by organic amendments towards higher aromaticity, molecular weight, and stability. VC resulted in a greater increase of humic-like fractions but reduced protein-like proportions in rhizosphere DOM over BC. Negative correlations were observed between humic-like fractions and available Cd in the rhizosphere. Likewise, VC (especially 5%VC) promoted the formation of Fe-plaque and limited Cd soil-to-root transport, while BC groups showed a reverse trend. The results of hydroponic experiments confirmed BC- and VC-derived DOM and Fe-plaque further inhibited Cd uptake by rice via the complexation with Cd and the sequestration of Cd, respectively. Hence, VC application combined with low Cd-accumulation rice could be an effective strategy for the safe utilization of Cd-contamination soils.

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Authors+Show Affiliations

Liu N
College of Resources and Environment, Department of Environment Science and Engineering, Southwest University, Chongqing 400715, China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400715, China; State Cultivation Base of Eco-agriculture for Southwest Mountainous Land, Southwest University, Chongqing 400715, China.
Lou X
College of Resources and Environment, Department of Environment Science and Engineering, Southwest University, Chongqing 400715, China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400715, China; State Cultivation Base of Eco-agriculture for Southwest Mountainous Land, Southwest University, Chongqing 400715, China.
Li X
College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, Shaanxi, China.
Shuai Z
College of Resources and Environment, Department of Environment Science and Engineering, Southwest University, Chongqing 400715, China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400715, China; State Cultivation Base of Eco-agriculture for Southwest Mountainous Land, Southwest University, Chongqing 400715, China.
Liu H
College of Resources and Environment, Department of Environment Science and Engineering, Southwest University, Chongqing 400715, China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400715, China; State Cultivation Base of Eco-agriculture for Southwest Mountainous Land, Southwest University, Chongqing 400715, China.
Jiang Z
College of Resources and Environment, Department of Environment Science and Engineering, Southwest University, Chongqing 400715, China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400715, China; State Cultivation Base of Eco-agriculture for Southwest Mountainous Land, Southwest University, Chongqing 400715, China.
Wei S
College of Resources and Environment, Department of Environment Science and Engineering, Southwest University, Chongqing 400715, China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400715, China; State Cultivation Base of Eco-agriculture for Southwest Mountainous Land, Southwest University, Chongqing 400715, China. Electronic address: sqwei@swu.edu.cn.

MeSH

Biological AvailabilityCadmiumIronOryzaRhizosphereSoilSoil Pollutants

Pub Type(s)

Journal Article

Language

eng

PubMed ID

34153760

Citation

Liu, Na, et al. "Rhizosphere Dissolved Organic Matter and Iron Plaque Modified By Organic Amendments and Its Relations to Cadmium Bioavailability and Accumulation in Rice." The Science of the Total Environment, vol. 792, 2021, p. 148216.
Liu N, Lou X, Li X, et al. Rhizosphere dissolved organic matter and iron plaque modified by organic amendments and its relations to cadmium bioavailability and accumulation in rice. Sci Total Environ. 2021;792:148216.
Liu, N., Lou, X., Li, X., Shuai, Z., Liu, H., Jiang, Z., & Wei, S. (2021). Rhizosphere dissolved organic matter and iron plaque modified by organic amendments and its relations to cadmium bioavailability and accumulation in rice. The Science of the Total Environment, 792, 148216. https://doi.org/10.1016/j.scitotenv.2021.148216
Liu N, et al. Rhizosphere Dissolved Organic Matter and Iron Plaque Modified By Organic Amendments and Its Relations to Cadmium Bioavailability and Accumulation in Rice. Sci Total Environ. 2021 Oct 20;792:148216. PubMed PMID: 34153760.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Rhizosphere dissolved organic matter and iron plaque modified by organic amendments and its relations to cadmium bioavailability and accumulation in rice. AU - Liu,Na, AU - Lou,Xuge, AU - Li,Xiong, AU - Shuai,Zuping, AU - Liu,Hanyi, AU - Jiang,Zhenmao, AU - Wei,Shiqiang, Y1 - 2021/06/03/ PY - 2021/01/18/received PY - 2021/05/18/revised PY - 2021/05/29/accepted PY - 2021/6/22/pubmed PY - 2021/9/1/medline PY - 2021/6/21/entrez KW - Availability and bioaccumulation KW - Cadmium KW - Dissolved organic matter KW - Fe-plaque KW - Organic amendment KW - Rice SP - 148216 EP - 148216 JF - The Science of the total environment JO - Sci Total Environ VL - 792 N2 - Organic amendments can modify rhizosphere dissolved organic matter (DOM) properties and Fe-plaque quantity, thereby affecting cadmium (Cd) bioavailability and uptake by rice. Pot experiments were conducted to investigate effects of biochar (BC) and vermicompost (VC) at different rates (0, 1%, and 5%) on rhizosphere DOM characteristics and Fe-plaque quantity, and their impacts on Cd bioavailability and accumulation in high and low Cd-accumulation rice cultivars (HAC and LAC). Soil DOM was characterized by ultraviolet-visible (UV-Vis) and fluorescence excitation-emission matrix (EEM) spectrum analyses. Hydroponic experiments were conducted to investigate effects of BC- or VC-derived DOM combined Fe-plaque on Cd uptake by rice. Results showed that increasing rates of organic amendments increased DOM concentration while decreased Cd availability in rhizosphere and bulk soils and Cd contents in rice tissues. The Cd reduction in LAC grains (31.9%-72.7%) was better than that in HAC grains (6.3%-25.4%) after organic amendment addition. Soil DOM properties were modified by organic amendments towards higher aromaticity, molecular weight, and stability. VC resulted in a greater increase of humic-like fractions but reduced protein-like proportions in rhizosphere DOM over BC. Negative correlations were observed between humic-like fractions and available Cd in the rhizosphere. Likewise, VC (especially 5%VC) promoted the formation of Fe-plaque and limited Cd soil-to-root transport, while BC groups showed a reverse trend. The results of hydroponic experiments confirmed BC- and VC-derived DOM and Fe-plaque further inhibited Cd uptake by rice via the complexation with Cd and the sequestration of Cd, respectively. Hence, VC application combined with low Cd-accumulation rice could be an effective strategy for the safe utilization of Cd-contamination soils. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/34153760/Rhizosphere_dissolved_organic_matter_and_iron_plaque_modified_by_organic_amendments_and_its_relations_to_cadmium_bioavailability_and_accumulation_in_rice_ DB - PRIME DP - Unbound Medicine ER -