Carbon and nitrogen mineralization and enzyme activities in soil aggregate-size classes: Effects of biochar, oyster shells, and polymers
- Authors
- Awad, Yasser Mahmoud; Lee, Sang Soo; Kim, Ki-Hyun; Ok, Yong Sik; Kuzyakov, Yakov
- Issue Date
- 5월-2018
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Black carbon; Polymers; Soil aggregation; Nutrient dynamics; Enzyme activities
- Citation
- CHEMOSPHERE, v.198, pp.40 - 48
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMOSPHERE
- Volume
- 198
- Start Page
- 40
- End Page
- 48
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/75617
- DOI
- 10.1016/j.chemosphere.2018.01.034
- ISSN
- 0045-6535
- Abstract
- Biochar (BC) and polymers are cost-effective additives for soil quality improvement and long-term sustainability. The additional use of the oyster shells (OS) powder in BC- or polymer-treated soils is recommended as a nutrient source, to enhance aggregation and to increase enzyme activities. The effects of soil treatments (i.e., BC (5 Mg ha(-1)) and polymers (biopolymer at 0.4 Mg ha(-1) or polyacrylamide at 0.4 Mg ha(-1)) with or without the OS (1%)) on the short-term changes were evaluated based on a 30-day incubation experiment with respect to several variables (e.g., CO2 release, NH4+ and NO3- concentrations, aggregate-size classes, and enzyme activities in an agricultural Luvisol). The BC and BP with the addition of OS increased the portion of microaggregates (<0.25 mm) relative to the control soil without any additions, while PAM alone increased the portion of large macroaggregates (1-2 mm). Concentrations of NO3- also increased in soils treated with OS, OS + BC, and OS + BP as result of the increased chitinase and leucine aminopeptidase activities. The BC and BP when treated with the additional OS had significant short-term impacts on N mineralization without affecting C mineralization in soil. Consequently, the combination of BC or BP with OS was seen to accelerate N turnover without affecting C turnover (and related C losses) from soil. As such, the addition of these additives contributed considerably to the improvement of soil fertility and C sequestration. (C) 2018 Elsevier Ltd. All rights reserved.
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Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
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