生物炭对减弱土壤盐渍化的贡献及其机理探讨

发布时间：2018-07-06 14:39

  本文选题：生物炭 + 水稻土　； 参考：《西北农业学报》2017年02期

【摘要】：以3种不同盐碱化水稻土(吉林、宁夏和天津)为材料,采用土壤泥浆厌氧培养法,通过对添加不同用量生物炭的培养体系中游离碳酸盐质量摩尔浓度、pH、脱氢酶活性及Fe(II)质量分数的变化趋势分析,以期验证生物炭在减弱土壤盐渍化过程中的贡献及进行必要的机理探讨。结果表明:生物炭能够促进碳酸盐的溶出,在吉林、宁夏和天津3种水稻土中添加生物炭后,碳酸盐的溶出量较CK分别增长0.405~1.590、0.894~3.592、0.725~2.278μmol/g,且碳酸盐的溶出量随生物炭用量的增加而升高;添加生物炭对体系脱氢酶活性具有显著促进作用,3种土壤中脱氢酶活性较CK分别增加6.53~15.45、1.76~4.25和8.81~21.13μg/(mL·g·min);土壤pH在淹水过程均有降低,但由于土壤的缓冲性导致不同生物炭处理间无显著差异;生物炭的添加显著促进微生物铁还原进程,3种水稻土在培养过程中最大铁还原潜势较CK分别增长0.017~0.034、0.088~0.436、0.023~0.437μg/mL,且生物炭用量与Fe(Ⅱ)质量分数呈正相关。典范对应分析表明,土壤初始pH与碳酸氢盐变化量极显著相关,说明生物炭对碳酸盐溶出量的影响因土壤性质不同而存在差异;吉林和宁夏水稻土各处理差异显著,天津水稻土中,添加生物炭对铁还原过程有促进作用,但生物炭用量的作用差异不明显。推测生物炭通过促进土壤的脱氢-产氢过程进而增加碳酸盐向碳酸氢盐的转化,通过强化微生物铁还原过程增加对碳酸盐的固定。
[Abstract]:Using three different saline-alkali paddy soils (Jilin, Ningxia and Tianjin) as materials, the soil mud anaerobic culture method was used. The trend of pH, dehydrogenase activity and Fe (II) mass fraction of free carbonate in the culture system with different amounts of biochar were analyzed. In order to verify the contribution of biochar in the process of soil salinization and to explore the necessary mechanism. The results showed that biochar could promote the dissolution of carbonate. After adding biochar to three kinds of paddy soils in Jilin, Ningxia and Tianjin, the dissolved amount of carbonate increased by 0.405%, 1.590%, 0.894 渭 mol / g, respectively, and the amount of carbonate dissolved increased with the increase of the amount of biochar. Addition of biochar significantly promoted dehydrogenase activity in three soils. Compared with CK, the activity of dehydrogenase increased by 6.53 (15.45) 1.764.25 and 8.81 ~ 21.13 渭 g / (mL g min);), respectively. However, there was no significant difference between different biochar treatments because of soil buffer. The addition of biochar significantly promoted the process of microbial iron reduction. The maximum potential of iron reduction in the three paddy soils increased by 0.017 ~ 0.034 ~ 0.088 ~ (0.088) ~ 0.436N ~ (0.02323) ~ (0.437) 渭 g 路mL ~ (-1), respectively, and the amount of biochar was positively correlated with the mass fraction of Fe (鈪，

本文编号：2103119