生物炭修正案对持续耕作下矿井排水污染的米土壤中的米/的吸收和生长的影响
Wansheng Song1, Fengzhu Liu1, Chipeng Zhang2
1College of Resources and Environmental Engineering, Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang 550025, China.
Environmental research
|January 25, 2026
概括
竹子生物炭的应用修复了被 (As) 和铁 (Fe) 污染的土壤,改善了米的生长. 然而,生物炭的老化降低了其在长期有效地固定土壤污染物的有效性.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 农业化学 农业化学
背景情况:
- 酸性矿井排水污染了 (As) 和铁 (Fe) 的田,导致土壤酸化和降低了大米产量.
- 生物炭是一种潜在的土壤修改剂,用于修复退化农田,但由于土壤老化过程,其长期有效性需要进行调查.
研究的目的:
- 评估竹子衍生生物炭在被和铁污染的土中的长期修复效果.
- 在两年内调查Fe和As在土壤-生物炭-大米系统中的地化学行为.
- 评估生物炭老化对污染物固定和大米生长的影响.
主要方法:
- 收集了As污染的土壤,并以3%和5%的应用率修改了竹子生物炭.
- 在洪水条件下进行了为期两年的实验.
- 分析了土壤的pH值,溶解的Fe/As度,生物炭功能群,以及大米组织 (根,茎,谷物) 中的As/Fe含量.
主要成果:
- 生物炭最初增加了土壤的pH值和溶解的Fe/As度,但经过一年的老化,这些效应会减弱.
- 生物炭主要通过表面复合来固定Fe/As,老化后固定能力减少>65%.
- 生物炭的应用降低了米根中的Fe/As,增加了茎中的As,但没有显著影响谷物的As;促进了米的生长.
结论:
- 竹子生物炭可以最初修复污染的土,促进大米的生长.
- 生物炭老化显著降低其固定Fe和As的能力,影响长期的土壤整治.
- 尽管减少了固定性,但生物炭的应用对大米的生长提供了持续的好处,特别是1000粒重的米.
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