期刊
SOIL & TILLAGE RESEARCH
卷 223, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.still.2022.105495
关键词
Biochar; Calcium alginate; Karst soil; Nutrients; Retention; Slow-release
类别
资金
- National Natural Science Foundation of China [41977297]
- Special Research Fund of Natural Science (Special Post) of Guizhou University [(2020)01]
- Key Cultivation Program of Guizhou University [2019(08)]
This study focuses on the soil erosion problem in karst areas and synthesizes calcium alginate-biochar composites to investigate their retention and slow-release effects on nutrients. The results show that these composites have better retention effects under fertilization conditions. Additionally, different retention mechanisms for various nutrients are identified.
Soil erosion is a prominent environmental problem in karst areas. To reduce the loss of nutrients in karst soil, two kinds of calcium alginate-biochar composites (CA-MBs) were synthesized. Soil column leaching and pot experiments under different treatments were carried out to investigate the retention and slow-release of CA-MBs on nutrients. The results showed that the retention effects of calcium alginate-rice straw biochar composite (CAMRB300) and calcium alginate-Eupatorium adenophorum biochar composite (CA-MEB600) on nutrients under fertilization were better than that under non-fertilization. The addition of 0.5 wt% CA-MRB300 and CA-MEB600 reduced the loss of nutrients after fertilization, and 0.5 wt% CA-MRB300 reduced the cumulative leaching amount of PO43-, NH4+, NO3-, and K+ by 48.05%, 28.76%, 36.63%, and 9.08%, respectively. Surface precipitation, ion exchange, and physical adsorption were considered to be the main retention mechanisms of different nutrients based on analyzing the physicochemical properties of CA-MBs and their effects on soil physicochemical properties. The addition of 1.5 wt% CA-MRB300 had the best promotion effect on the root length, stem length, and dry weight of soybean under non-fertilization, indicating that CA-MRB300 could be used as a slow-release fertilizer to promote the growth of soybean. This study develops a novel soil amendment to reduce the loss of nutrients in karst soil.
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