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《Journal of Soil and Water Conservation》 2017-04
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Effect of Biochar on Soil Retention Ability in Dry Farmland

LIU Xiaoning;CAI Liqun;HUANG Yizong;DONG Bo;NAN Xuejun;GAO Zhiqiang;College of Resources and Environmental Sciences,Gansu Agricultural University;Agro-Environment Protection Institute,Ministry of Agriculture;  
In order to illustrate the effect of biochar on soil retention ability in dry farmland,this study measured the soil bulk density,soil porosity,soil moisture constants and the soil water retention curve of the soil with different biochar addition through setting located experiment in typical dry farmland of the Loess Plateau.The results showed that biochar adding reduced soil bulk density,and increased soil porosity.With the increasing of the biochar adding,the reduction range of soil bulk density and the increasing extent of soil porosity were both enhanced.The change of soil structure was the most obvious when the adding amount of biochar reached 50t/hm~2.Soil bulk density of 0—5cm,5—10cm and 10—30cm soil layers decreased by7.01%,9.91%and 16.60%compared with control group,respectively,and soil capillary porosity increased by 19.47%,21.02% and 29.94% compared with control group,respectively.The biochar adding increased soil saturated soil water content,soil field capacity and soil effective moisture content.With the increasing of the biochar adding,all the soil moisture constants showed rising trends,but the increasing extent decreased when the biochar amount reached 40t/hm~2.This study suggests that the addition of biochar improved the water retention ability of dry farmland,but the retention ability of soil tended to be stable when the adding amount of biochar reached 40t/hm~2.
【Fund】: 国家自然科学基金项目(31571594 31160269);; 国家“十二五”循环农业科技工程项目(2012BAD14B03);; 甘肃省自然科学基金项目(145RJZA106)
【CateGory Index】: S152.7
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