数字农科院2.0

The Effect of Biochar Application Rates on Soil Fertility and Phyto-Availability of Heavy Metals is Dependent on Soil Type and pH

文献类型： 外文期刊

作者： He, Yi;Zhang, Jiuquan;Li, Caibin;Zhang, Long;Fu, Delong

作者机构：

关键词： Application rate;available nutrient;biochar;heavy metal;soil type

期刊名称： COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS

ISSN： 0010-3624

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： The effect of biochar application rate on soil nutrient and heavy metal phyto-availability may differ depending on soil properties. To investigate this hypothesis, a pot experiment was conducted with three soil types (yellow soil (YS), yellow-brown soil (YBS) (slightly alkaline), and calcareous soil (CS) (neutral soil)), using five biochar application rates: 0, 0.1%. 1.0%, 2.5%, and 5.0%. The results showed that the total organic carbon increased progressively in all three soil types, while the labile organic carbon only increased progressively in yellow soil with an increasing rate of biochar from 0% to 5%. The ammonia and Olsen-phosphorus concentrations increased with higher biochar rates for the slightly alkaline soils, but decreased significantly at higher rate for the neutral soil. Additionally, the application of biochar at 2.5% and 5.0% significantly reduced soil nitrate concentrations in slightly alkaline YS soil (by 31.10% and 37.83%) and YBS soil (by 65.96% and 76.70%) compared to the control, but did not change significantly in the neutral soil. Biochar application increased soil exchangeable potassium (K) concentration more significantly in high K soils compared to low K soil. The exchangeable calcium (Ca) concentration increased with increasing biochar rate if the exchangeable Ca was < 10.6 cmol kg-1. The effect of biochar application rate on phyto-availability of cadmium, copper, and nickel concentrations varied with the background soil value and soil pH. For all three types of soil, the phyto-availability of lead, chromium, and arsenic decreased significantly with increasing biochar rates. In conclusion, it is important to carefully consider soil type and pH when utilizing biochar as a soil amendment to maximize its efficiency.

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