生物炭对紫色土中腐植酸淋溶的影响

Effects of biochar on purple soil humus acid leaching

为了减少紫色土腐植酸的流失,提高龙川江流域紫色土肥力,采用土柱室内模拟方法,通过模拟降雨淋溶,研究了不同生物炭处理下(CK、1%、3%、5%和10%)对紫色土淋溶液p H值、电导率、体积以及胡敏酸和富里酸的影响。结果表明:在29 d试验过程中,淋溶液的p H值和电导率随着生物炭比例增加而增加;与CK相比,在1%、3%、5%和10%的生物炭处理条件下紫色土水分损失分别减少了6.33%、10.13%、16.46%和25.32%;胡敏酸浓度和累积淋失量随着生物炭比例增加而减小;除了1%和3%之外,富里酸浓度和累积淋失量也随着生物炭比例增加而减小;生物炭比例为10%的处理条件下对紫色土淋溶液中胡敏酸和富里酸浓度及累积淋失量最小,胡敏酸浓度和累积淋失量分别为1.46 mg/L、0.12 mg,富里酸浓度和累积淋失量分别为149.64 mg/L、29.60 mg,该处理有利于更大程度吸附胡敏酸和富里酸,减少其流失。

In order to reduce the loss of humus acid on purple soil and increase the fertility of purple soil in Longchuanjiang river basin,using laboratory simulation method,this paper studied the effects of different contents of biochar（ CK,1%,3%,5%,10%） on the p H,electrical conductivity（ EC）,leachate volume,humic acid and fulvic acid concentrations in a batch of purple soil columns under simulated raining condition. The results indicated that the p H and EC of the leaching solution gradually increased with the increase of the biochar proportion during the 29 day experiment. Compared with CK,the water loss of purple soil decreased by 6. 33%,10. 13%,16. 46% and 25. 32% under different treatments of biochar（ 1%,3%,5% and 10%）,respectively. The humic acid concentration and cumulative leaching loss decreased with the increase of biochar proportion. The fulvic acid concentration and cumulative leaching loss decreased with the increase of biochar proportion,except for 1% and 3% treatments. Under the proportion of biochar of 10%,the concentration and cumulative leaching loss of humic acid and fulvic acid on purple soil leaching solution were the least,the concentration and cumulative leaching loss of humic acid were 1. 46 mg/L and 0. 12 mg,the concentration and cumulative leaching loss of fulvic acid were 149. 64 mg/L and 29. 60 mg,which were beneficial to adsorb humic acid and fulvic acid and reduce their losses.