HE Yunyong1,2，LEE Xinqing1，*，YANG Fang1,2，CHENG Hongguang1,2， ZHANG Like1,2，WANG Qian1,2， HUANG YiMin1,2， LI Yang1,2
（1．State Key Laboratory of Environment Geochemistery, Institute of Geochemistery, Chinese Academy of Science, Guiyang 550081, China;
2. University of Chinese Academy of Sciences, Beijing 100049,China;）
Abstract: Pyrolysis temperature exerts great influence on physicochemical properties of biochar pyrolysic products, further on their field applications. Generally, cotton stalks are main agricultural biomass resources in arid areas, especially in the Xinjiang Autonomous Region, China and the application of biochar can overcome the drawbacks of the current utilization of straw. However, knowledge on cotton biochar physicochemical properties and their variation were seldom reported. In this study, effects of various pyrolysis temperatures on physicochemical properties of Xinjiang cotton straw biochar were investigated. Results show that, with increasing pyrolysis temperature, all of the yield, cation exchange capacity(CEC)，H/C, and O/C ratios of biochar decrease, whereas the pH, electrical conductivity and water holding capacity increase; there were neither significant positive nor negative correlations of Na+ and K+ contents with temperature, respectively, meanwhile, contents of saline ions such as Cl– and SO42- , and nutritional elements such as Ca2+ and Mg2+ decrease with increasing pyrolysis temperature; while contents of carbon, nitrogen, sulfur, C/N ratio and ash increase with increasing pyrolysis temperature; the highest content of NH4+-N was detected at B550. All of these results indicate that biochar pyrolysis temperature should be properly adjusted considering the characteristics of the soil.
Key Words：biochar; pyrolysis temperature; physicochemical property；carbon sequestration
EARTH AND ENVIRONMENT Vol. 44, No.1 Tot No.309, 2016, Page 19-24
