生物炭添加对滨海盐土柳枝稷生长的影响

Effect of Biochar Application on Switchgrass Growth on Coastal Saline Soil

为探究生物炭在滨海盐土改良中的作用以及对植物生长的影响,通过田间试验,采用穴施方式添加450℃热解玉米秸秆炭(1%、2%),分析了滨海盐土理化性质和柳枝稷生长特性的响应。结果表明:生物炭添加后第一个生长季,土壤容重降低3.9%以上,田间持水量、毛管孔隙度、有机碳含量分别提高7.4%、4.0%、68.3%以上,柳枝稷成活率提高18.4%以上,地上和地下干重分别增加198.4%、91.4%以上,地上部和地下部的生长明显改善,柳枝稷可以选择性地吸收K+。因此,采用穴施方式添加生物炭,可以改善滨海盐土的部分理化性质,进而促进柳枝稷的生长,提升其耐盐能力。

In order to evaluate the role of biochar in the improvement of coastal saline soil and plant growth,field experiments were conducted to analyze the effect of corn stalks biochar(pyrolyzed at 450℃)hole fertilization(1%and 2%)on coastal saline soil physical and chemical properties as well as switchgrass(Panicum virgatum)growth in Bohai Rim,China.The results showed that the application of corn stalks biochar to coastal saline soil decreased soil bulk density by over 3.9%and increased field capacity,capillary porosity,and organic carbon content by over 7.4%,4.0%,and 68.3%,respectively,in the first vegetation season.After biochar application,the survival rate of switchgrass increased by over 18.4% and both aboveground and underground dry biomass increased by over 198.4% and 91.4%,respectively.The shoot and root growth of switchgrass as well as the absorption of K+increased significantly.It was concluded that the application of biochar by hole fertilization could improve certain physical and chemical properties of coastal saline soil to promote switchgrass growth and facilitate its salt tolerance.