摘要
在实验室通过生物炭与FeCl3的不同配比确定了生物炭的最佳改性条件,并利用土柱模拟试验,研究改性生物炭对土壤硝态氮和有效磷淋失的影响。结果表明,Fe3+与生物炭质量比为0.7是最佳改性条件,改性作用大大增强了生物炭吸附硝态氮和有效磷的能力。在含N量为50mg.L-1的KNO3和含P量为50mg.L-1的KH2PO4溶液中,最佳改性炭的吸附量分别比改性前提高了12倍和66倍,氮和磷的理论最大吸附量分别为2.47mg.g-1和16.58mg.g-1。土壤中添加最佳改性炭能够延缓并减少硝态氮和有效磷的淋失,添加量为2.5%、5%和10%与不添加任何物质的对照相比,硝态氮的淋失量分别显著降低20%、43%和59%(P<0.05),有效磷的淋失量分别显著降低45%、59%和75%(P<0.05),表明土壤中添加改性生物炭能够有效降低土壤硝态氮和有效磷的淋失风险。
Modified biochar was studied as a soil additive in this paper to increase use efficiency of soil nitrate nitrogen （ NO3 - N） and available phosphorous （P） in soil profile, and reduce the leaching risk. The best modified condition for crop biochar were determined by laboratory experiment and the effect of modified biochar on leaching of soil NO3 - N and available P was studied by soil column simulation test. The Fe3 ~ to biochar mass ratio of 0.7 was tested to be the best modified condition which would increase the absorption of NO3 - N and available P greatly. Modified biochar could absorb 12 more times of NO3 -N and 66 more times of available P compared to unmodified biochar,in a KNO3solution with 50mg ~ L-~ N concentration and a 50mg ~ L-1 P concentration KHzPO4 solution,the maximum amount of absorp- tion was 2. 47mg ~ g-~for NO3 - N and 16. 58mg ~ g-~ for available P, respectively. When 2. 5% ,5% and 10% of best modified biochar was added in soil, the NO3 - N leakage was significantly reduced, by 20% ,43 % and 59% ＇respective- ly compared to the control with no biochar addition. Available P leakage was also significantly decreased, by 45% , 59% and 75% respectively. This study demonstrated that adding modified biochar in soil could effectively reduce NO3 -N and P leakage in the soil profile.
出处
《中国农业气象》
CSCD
北大核心
2012年第2期220-225,共6页
Chinese Journal of Agrometeorology
基金
国家"十二五"863计划项目(2011AA100503)
JICA中国可持续农业技术研究发展计划(二期)
关键词
改性生物炭
硝态氮
有效磷
淋失
Modified biochar
Nitrate nitrogen
Available phosphorus
I_~aching
