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| DOI：10.13522/j.cnki.ggps.2021563 |
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| Using Biochar Amendment to Improve the Physicochemical Properties of Soil in Coastal Tidal Area |
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WANG Juan, HUANG Chengzhen, FENG Shaoyuan, LIU Chuncheng, LI Hao, HAN Qibiao
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1. Institute of Farmland and Irrigation, Chinese Academy of Agricultural Science/
Key Laboratory of Water Saving Irrigation Project of Ministry of Agriculture, Xinxiang 453002, China;
2. College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China
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| Abstract: |
| 【Objective】Coastal soils are rice in China but most of them are salinized. Improving their quality to facilitate crop growth is essential to safeguard the food security in China. The aim of this paper is to investigate the feasibility of using biochar amendment to improve physical and physicochemical properties of such soils. 【Method】The experiments were conducted using repacked pots; soil in the pots were amended with traditional biochar (A) or acidified biochar (B) applied at mass ratio ranging from 2% to 8%. Traditional remediation without biochar amendment was the control (CK). In each treatment, we measured the change in physical and physicochemical properties of the soils after a period of incubation. 【Result】Biochar amendment significantly reduced soil bulk density, increased soil porosity and the capacity of the soil to hold water, regardless of the biochar types. The improvement increased with biochar application ratio. On average, the traditional biochar was more effective than the acidified biochar. A moderate biochar amendment ratio enhanced salt leaching, improving desalination rate and reducing pH. Amending the soil with the acidified biochar at 2% ratio achieved the highest leaching rate - 72.05%, whereas amending the soil with the traditional biochar at 8% ratio was least effective. We also found that adding biochar significantly increased soil organic matter and nitrate nitrogen, especially the traditional biochar applied at 8% and the acidized biochar applied at 4%. 【Conclusion】Both traditional and acidified biochar can effectively reduce soil salinity and improve soil fertility in the coastal tidal area. Considering improvement in soil water and fertility as well as desalinization, the acidified biochar applied at the ratio of 4% was optimal. |
| Key words: acidified biochar; soil bulk density; soil water holding capacity; desalination; soil nutrient |
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