Application of different biomass charcoal modified by chitosan to the improvement of acidic red soil in Hainan
The purpose of this paper is to prepare biochar from agricultural wastes to reduce the structural degradation and soil fertility poverty of acid soil in Hainan.The measure we would like to take may include a batch of experiments,a set of control measures without any amendment(CK),rice husk biochar(BR),corncob biochar(BC),bagasse biochar(BS),banana pseudostem biochar(BB),chitosan modified rice husk biochar(BR-C),chitosan modified corncob biochar(BC-C),chitosan modified bagasse biochar(BS-C),chitosan modified banana pseudostem biochar(BB-C).To achieve the predetermined purpose,we evaluated the remediation effect by analyzing the characteristics of biochar and the content soil's physical and chemical properties,to select the modifiers suitable for acidic soil.Scanning electron microscope and Fourier transform infrared spectroscopy showed that new functional groups were introduced after chitosan modification,but chitosan particles also blocked the pore structure of biochar and reduced the specific surface area of the material.On the other hand,the addition of biochar and chitosan-modified biochar.The pH value increased by 0.61-2.28,the content of ammonium nitrogen increased by 10％-43％,the content of available P increased by 8％-34％,the content of available K increased by 17％-77％,the CEC content increased by 26％-89％,the content of organic matter increased by 26％-107％,the content of sucrase increased by 5％-34％,and the content of urease increased by 7％-58％.In addition,BB-C had a significant improvement effect on soil pH,ammonium nitrogen and urease,BB had a significant effect on soil-available phosphorus,CEC,and organic matter.BR had a significant effect on soil-available potassium,and BS-C had a significant effect on soil sucrase.In addition,we also found that the improvement of biochar was greater than that of chitosan-modified biochar in terms of available phosphorus,available potassium,CEC,and organic matter content,while chitosan-modified biochar had better improvement ability in pH,ammonia nitrogen,sucrase,and urease content.Thus,it can be concluded that the results of our finding are in a position to provide a valuable reference for the improvement of chitosan-modified biochar improving the Hainan red-acid soil quality in a way.
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万方数据
维普
