【摘要】：生物炭性質(zhì)雖然穩(wěn)定,卻也并非一成不變,其理化性質(zhì)會(huì)隨著時(shí)間推移而發(fā)生緩慢變化,進(jìn)而對(duì)其功能產(chǎn)生影響。為明確陳化對(duì)生物炭理化性質(zhì)的影響,探明生物炭陳化機(jī)制。以稻殼生物炭為試驗(yàn)材料,利用PVC圓柱,在人工氣候箱中通過(guò)25個(gè)周期凍融循環(huán)(30℃/10d,-25℃/10d)和淋溶模擬生物炭陳化過(guò)程,分析生物炭表觀結(jié)構(gòu)、元素組成、氧化程度、吸附能力、pH值、碳酸鹽含量等理化性質(zhì)變化。結(jié)果表明:陳化處理破壞稻殼生物炭的表觀結(jié)構(gòu)、增加表面孔隙且隨處理周期延長(zhǎng)破壞程度加劇。C元素含量和C/H比值在25個(gè)周期中沒(méi)有顯著變化,C/N比值、速效P和N含量呈先下降后平穩(wěn)趨勢(shì),速效K含量由7917mg·kg~(-1)下降到917mg·kg~(-1),達(dá)極顯著水平。陳化處理初期生物炭表面O/C比值迅速上升,到第7個(gè)周期后開(kāi)始下降,到15個(gè)周期后趨于平穩(wěn),說(shuō)明陳化處理初期稻殼生物炭表面氧化迅速,后期則趨于平穩(wěn)。陳化處理到25個(gè)周期時(shí),生物炭對(duì)對(duì)苯二酚的吸附量由初始的5.93mg·g~(-1)增加到11.73mg·g~(-1),說(shuō)明陳化處理增加了稻殼生物炭的吸附能力。陳化處理對(duì)pH值的影響呈先下降后上升,最后趨于平穩(wěn),且與原始生物炭pH值無(wú)顯著差異。碳酸鹽含量則呈現(xiàn)下降趨勢(shì)至20個(gè)周期后趨于平穩(wěn)。綜合分析表明陳化處理對(duì)稻殼生物炭理化性質(zhì)有一定影響,對(duì)其速效養(yǎng)分和吸附能力影響較顯著。
[Abstract]:Although the properties of biochar are stable, they are not fixed, and their physicochemical properties will change slowly with time, which will have an effect on their functions. In order to clarify the effect of aging on the physicochemical properties of biochar, the aging mechanism of biochar was investigated. Using rice husk biochar as experimental material, 25 cycles of freeze-thaw cycle (30 鈩，

本文編號(hào)：2216414