施用生物炭对稻田土壤密度的影响研究

Study on The Effect of Biochar Application on Paddy Soil Density

生物质在无氧或低氧条件下高温热解炭化而成的产物称为生物炭。一般认为其多孔特性和巨大的比表面积有利于聚集土壤水分、提高土壤孔隙度、降低土壤容重,从而为植物生长提供良好的环境。通过施用3种不同原料来源的生物炭开展水稻田间试验,研究不同类型生物炭及不同施用方式对稻田土壤密度的潜在影响。结果表明,在同一块田地上连续施入生物炭第3年时,测得土壤密度与空白对照和常规处理相比并没有显著差异,且生物炭施用方式及不同生物炭类型之间亦未有显著差异。这可能与本研究中生物炭用量相对较低,以及田间试验时间相对较短有关。

Biochar was the product of biomass pyrolysis in anaerobic or low oxygen conditions. It had much porous properties and large specific surface area, and was conducive to the accumulation of water, improving soil porosity, and reducing soil bulk density, so as to provide a good environment for the growth of plants. In this paper, rice experiment was carried out by using 3 types of biochar in paddy field. The potential effect of different kinds of biochar and different application method on bulk density in paddy field was investigated. The result showed that there was no significant difference between the measured soil bulk density in the treatment of continuous application of biochar for three years and the bulk density in control and traditional treatment. There was also no significant difference between soil bulk densities in the treatment with different types of biochar and the bulk densities in the treatment with different application methods of biochar. This may be related to the relatively low application amount of biochar and a relatively short time of field experiment.