Purpose

Biochar, as a stable carbon-rich material, has received concentrated attention in soil quality improvement, especially in soil carbon sequestration. This study aimed to find out the effects of biochar application on carbon stock in the whole salt-affected soil ecosystems.

Methods

This study was conducted in a heavy salt-affected soil, aiming at investigating biochar application effects on salt-affected soil organic carbon (SOC), soil inorganic carbon (SIC), as well as plant (Tamarisk chinensis) biomass carbon stocks.

Results

After 4 years of biochar application of 30, 60, and 90 t ha⁻¹, the results showed that biochar increased soil total organic carbon (STOC) stock by 54.78, 160.44, and 198.33%, and biochar increased soil total inorganic carbon (STIC) stock by 13.85, 11.04, and 16.03%, respectively. Further, it is calculated that biochar increased native SOC (extra SOC excluding biochar carbon) by 7.63, 66.15, and 56.90% and SIC by 13.55, 10.44, and 15.12%, respectively. In addition, biochar application accelerated Tamarisk chinensis growth by 10.03, 23.54, and 11.28%, respectively. Combining all the SOC, SIC, and plant-derived carbon, it is concluded that biochar application enlarged salt-affected soil-vegetation ecosystem carbon stock by 23.36, 47.80, and 58.10%, respectively.

Conclusion

These results indicated that applying biochar in salt-affected soil can enhance salt-affected soil-vegetation ecosystem carbon stocks. The mechanisms behind this phenomenon may be that biochar improves soil water content and bulk density, which promotes Tamarisk chinensis growth. Biochar has a good potential to improve salt-affected soil quality and mitigate climate change.

中文翻译：

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生物炭促进盐生植物生长并增加沿海受盐影响土壤的土壤碳储量

目的

生物炭作为一种稳定的富碳材料，在土壤质量改良特别是土壤固碳方面受到了广泛关注。本研究旨在找出生物炭的应用对整个受盐影响的土壤生态系统碳储量的影响。

方法

本研究在重度盐害土壤中进行，旨在研究生物炭应用对盐害土壤有机碳（SOC）、土壤无机碳（SIC）以及植物（柽柳）生物量碳储量的影响。

结果

生物炭施用量为30、60和90 t ha ⁻¹ 4年后，结果表明，生物炭使土壤总有机碳（STOC）库增加了54.78、160.44和198.33%，生物炭增加了土壤总无机碳（STIC）。 ）股票分别上涨13.85%、11.04%和16.03%。此外，据计算，生物炭使天然 SOC（不包括生物炭碳的额外 SOC）分别增加了 7.63、66.15 和 56.90%，SIC 分别增加了 13.55、10.44 和 15.12%。此外，生物炭的施用使柽柳生长速度分别加快了10.03%、23.54%和11.28%。结合所有的 SOC、SIC 和植物来源的碳，可以得出结论，生物炭的应用使受盐影响的土壤植被生态系统碳储量分别增加了 23.36%、47.80% 和 58.10%。

结论

这些结果表明，在受盐影响的土壤中施用生物炭可以提高受盐影响的土壤植被生态系统的碳储量。这一现象背后的机制可能是生物炭提高了土壤含水量和容重，从而促进了柽柳的生长。生物炭在改善受盐影响的土壤质量和减缓气候变化方面具有良好的潜力。