不同炭化条件对黑沙蒿生物炭保水性能的影响

发布时间：2018-04-30 05:23

  本文选题：沙蒿 + 生物炭　； 参考：《北方园艺》2017年06期

【摘要】：生物炭具有丰富的孔隙结构和巨大的比表面积,是一种良好的保水材料。为探究沙蒿生物炭保水效果对炭化条件的响应,设置不同的炭化温度、炭化时间和升温速率3个炭化条件,对沙蒿进行无氧炭化,研究各种生物炭的吸水和保水效果。结果表明:生物炭和沙蒿的吸水率均较高,分别为4 246.6~4 803.3g·kg~(-1)和5 340.3g·kg~(-1);600℃的生物炭在去离子水中的保水能力相对较强,其拟合曲线的决定系数为0.963 4~0.986 2,且炭化60min时最大,为0.986 2,沙蒿最小,为0.938 1;在沙土中的蒸发速率分别为自然沙的0.955~0.996倍和0.996倍,600℃炭化60min时最小,炭化5min时最大。而升温速率在生物炭的吸水和保水效果中不起决定作用。因此,生物炭的保水性能主要取决于炭化温度和时间,其吸水和保水性能不具有一致性,而在去离子水和沙土中的保水性能具有一致性;600℃炭化60min的生物炭是提高沙土保水性能的最优选择。
[Abstract]:Biochar is a good water-retaining material with abundant pore structure and huge specific surface area. In order to investigate the response of water retention effect of Artemisia annua to carbonization conditions, different carbonization temperature, carbonization time and heating rate were set up to carbonize Artemisia annua in anaerobic carbonization, and the water absorption and water retention effects of various biological carbon were studied. The results showed that the absorbency of biochar and Artemisia annua were both higher, which were 4 246.6 g / kg ~ (-1) and 5 340.3g / kg ~ (-1) C ~ (-1) respectively. The water retention capacity of biochar in deionized water was relatively strong. The determining coefficient of fitting curve was 0.963 ~ 0.986 ~ (2), and the largest one was carbonized 60min. The evaporation rate of Artemisia annua in sandy soil was 0.955 ~ 0.996 times of that of natural sand and 0.996 times of that of natural sand at 600 鈩，

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