本文選題：生物炭 + 水稻土　； 參考：《西北農(nóng)業(yè)學(xué)報》2017年02期

【摘要】：以3種不同鹽堿化水稻土(吉林、寧夏和天津)為材料,采用土壤泥漿厭氧培養(yǎng)法,通過對添加不同用量生物炭的培養(yǎng)體系中游離碳酸鹽質(zhì)量摩爾濃度、pH、脫氫酶活性及Fe(II)質(zhì)量分?jǐn)?shù)的變化趨勢分析,以期驗證生物炭在減弱土壤鹽漬化過程中的貢獻(xiàn)及進(jìn)行必要的機理探討。結(jié)果表明:生物炭能夠促進(jìn)碳酸鹽的溶出,在吉林、寧夏和天津3種水稻土中添加生物炭后,碳酸鹽的溶出量較CK分別增長0.405~1.590、0.894~3.592、0.725~2.278μmol/g,且碳酸鹽的溶出量隨生物炭用量的增加而升高;添加生物炭對體系脫氫酶活性具有顯著促進(jìn)作用,3種土壤中脫氫酶活性較CK分別增加6.53~15.45、1.76~4.25和8.81~21.13μg/(mL·g·min);土壤pH在淹水過程均有降低,但由于土壤的緩沖性導(dǎo)致不同生物炭處理間無顯著差異;生物炭的添加顯著促進(jìn)微生物鐵還原進(jìn)程,3種水稻土在培養(yǎng)過程中最大鐵還原潛勢較CK分別增長0.017~0.034、0.088~0.436、0.023~0.437μg/mL,且生物炭用量與Fe(Ⅱ)質(zhì)量分?jǐn)?shù)呈正相關(guān)。典范對應(yīng)分析表明,土壤初始pH與碳酸氫鹽變化量極顯著相關(guān),說明生物炭對碳酸鹽溶出量的影響因土壤性質(zhì)不同而存在差異;吉林和寧夏水稻土各處理差異顯著,天津水稻土中,添加生物炭對鐵還原過程有促進(jìn)作用,但生物炭用量的作用差異不明顯。推測生物炭通過促進(jìn)土壤的脫氫-產(chǎn)氫過程進(jìn)而增加碳酸鹽向碳酸氫鹽的轉(zhuǎn)化,通過強化微生物鐵還原過程增加對碳酸鹽的固定。
[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，

本文編號：2103119