Effect of biochar on the stability of soil aggregates and nitrogen distribution of fertilizer in woodland soil

ZHANG Weiting; GUO Yuxuan; WEI Yuanhui; JIA Guanghao; MAO Yanling

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ZHANG W T, GUO Y X, WEI Y H, et al. Effect of biochar on the stability of soil aggregates and nitrogen distribution of fertilizer in woodland soil [J]. Fujian Journal of Agricultural Sciences，2024，39（X）：1−9

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ZHANG W T, GUO Y X, WEI Y H, et al. Effect of biochar on the stability of soil aggregates and nitrogen distribution of fertilizer in woodland soil [J]. Fujian Journal of Agricultural Sciences，2024，39（X）：1−9

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Effect of biochar on the stability of soil aggregates and nitrogen distribution of fertilizer in woodland soil

ZHANG Weiting^{1, 2
,},
GUO Yuxuan^{1, 2},
WEI Yuanhui^{1, 2},
JIA Guanghao^{1, 2},
MAO Yanling^{1, 2, 3
,
,}

1.
College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou, Fujian　350002, China
2.
University Key Lab of Soil Ecosystem Health and Regulation, Fuzhou, Fujian　350002, China
3.
Fujian Colleges and Universities Engineering Research Institute of Conservation & Utilization of Natural Bioresources, Fuzhou, Fujian　350002, China

Received Date: 2023-12-19
Rev Recd Date: 2024-03-18

Available Online: 2024-04-03

Abstract

Abstract

Objective Soil erosion resistance, permeability, and water retention of woodland soils are closely related to the structural stability of soil aggregates. The study on the effects of biochar addition on soil structure stability and residual nitrogen distribution can provide reference for enhancing the stability of soil aggregates and improving the level of soil nitrogen retention. Method In this study a pot experiment (1 year) was conducted based on the woodland soil in Fujian Province and four treatments were set up: control (CK), chemical fertilizer (F), wood biochar + chemical fertilizer (MC), and straw biochar + chemical fertilizer (JC). In addition to CK, the application amounts of urea, superphosphate and potassium chloride in each basin were 1g, 2.19g and 0.44g, respectively. ¹⁵N-urea was used for topdressing, a total of 5g was applied, and the application amount of biochar was 140g per basin. The effects of biochar on soil aggregate stability and nitrogen distribution were analyzed by measuring soil aggregate content, aggregate stability index, aggregate nitrogen content and distribution, combined with¹⁵N tracer technology to analyze the residual characteristics of fertilizer nitrogen in soil aggregates. Results (1) Compared with F treatment, MC and JC treatment significantly increased the content of soil macroaggregates, and the content of soil macroaggregates ＞2 mm increased the most, by 108.92% and 119.11%, respectively. (2)The application of biochar enhanced the stability of soil aggregates. Compared with F treatment, the stability indexes of MWD, GMD and aggregates with R_＞0.25mm under MC and JC treatment were significantly increased, while D was significantly decreased. The stability of soil aggregates under JC treatment was better than that under MC treatment.(3) The application of biochar increased the total nitrogen content of soil aggregates of different particle sizes, and the total nitrogen content of MC treatment was higher than that of JC, and the nitrogen contribution rate of aggregates ＞2 mm was significantly increased by 38.09% and 69.10%, respectively, compared with F treatment. (4) The application of biochar enriched δ¹⁵N in 0.25～2 mm aggregates, and the residue nitrogen of soil fertilizer under MC and JC treatment was the highest in ＞0.25 mm aggregates, which significantly increased by 2.25 times and 3.89 times compared with F treatment. The residual nitrogen fertilizer in soil large aggregates was significantly positively correlated with the stability of aggregates. Conclusion The application of biochar can enhance the stability of soil aggregates and reduce the loss of soil nitrogen and fertilizer. The retention of fertilizer nitrogen in large aggregates is higher than that in micro-aggregates. Straw biochar has a more significant effect on the stability of soil aggregates, and wood biochar application is more conducive to the increase of soil nitrogen content.
- Biochar,
- Aggregate stability,
- Nitrogen fertilizer utilization,
- The ¹⁵N mark,
- Woodland soil structure

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References(26)

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