Physical and Chemical Characteristics of Biochar of Ground Cover Plant Centella asiatica in Tea Gardens under Different Pyrolysis Temperatures and the Application in Soil and Water Conservation
Biochar was prepared by pyrolysis of Centella asiatica,a perennial creeping herb of Umbelliferae in tea garden,at 300℃,500℃ and 700℃ under anaerobic conditions.It was studied the effects of different pyrolysis temperatures on the characteristics of biochar,and explored the potential value of biochar structure in soil and water conservation.The results showed that the yield of biochar decreased(41.32％～29.45％)with the increase of pyrolysis temperature.At 700℃,the ash content of biochar increased by 58.93％compared with 300℃;The content of element C in biochar increases with the increase of temperature,while elements H,N and O decrease.The pH values of the three biochars increased(8.41～10.12)with the increase of temperature,all of which appeared alkaline.The specific surface area and pore volume of biochar increase with the increase of temperature,while the average pore size decreases at higher temperatures(500℃ and 700℃).Infrared spectrum shows that the biochar prepared at 500℃ is rich in oxygen-containing functional groups and has a more stable structure.Combined with the physical and chemical characteristics and characterization structure of biochar,biochar prepared at higher pyrolysis temperature is expected to be applied in the soil and water conservation.
Centella asiaticaBiocharPyrolysis temperaturesoil and water conservation
万方数据
维普
