1.Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resource,College of Resources and Environment,Inner Mongolia Agricultural University,Hohhot,Inner Mongolia 010018,China
2.Key Laboratory of Agricultural;Ecological Safety and Green Development of Autonomous Region in Higher Education,Hohhot,Inner Mongolia 010018,China
Objective The effects of different preparation temperatures for hydrochars from sunflower straw on soil organic carbon (SOC) and its components were investigated to provide a theoretical basis for sunflower straw resource utilization and soil carbon sequestration. Methods Hydrochars (SB180 and SB220) were prepared from sunflower straw at 180 ℃ and 220 ℃, respectively, and indoor incubation tests were conducted to analyze the differential regulation of SOC and its fractions by varying preparation temperatures and additive amounts of hydrochar input. Results ① The carbon content, aromaticity, specific surface area, and pore volume of the hydrochars gradually increased with increasing preparation temperature. ② The contents of SOC, mineral-associated organic carbon (MAOC), and particulate organic carbon (POC) significantly increased with increasing preparation temperature and addition amount. SOC, POC and MAOC reached their highest levels in the 2% SB220 treatment, increasing by 75.34%, 23.34% and 105.75%, respectively, compared with CK. ③ As the preparation temperature increased, the soil organic carbon mineralization rate, cumulative mineralization amount, potentially mineralizable carbon (Cp ) and priming effect (PE ) decreased, whereas these values increased with higher addition amounts cumulative mineralization, Cp and PE were elevated by 50.88%, 57.61% and 79.51%, respectively, in 2%SB220 treatment compared to 1%SB220 . Conclusion SB220 can significantly enhance the contents of SOC, MAOC and POC, and exhibits strong carbon sequestration potential; however, the risk of carbon emissions increases with the increase of the addition amount. Therefore, it is recommended to add 1%SB220 to achieve a balance between mineralization loss and long-lasting sequestration.
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使用元素分析仪(vario EL cube,德国)对不同生物炭样品进行C, H,N等元素分析,O元素采用差减法计算得出:O%=100%-C%-H%-N%-灰分%[12]。生物炭的阳离子交换量(CEC)根据HJ889-2017采用三氯化六氨合钻浸提—分光光度法进行测定。使用全自动比表面积和孔径分析仪[13],将样品在423 K下通过氮气进行脱气处理,随后,对经过脱气处理的样品进行比表面积和孔隙测量,并运用BET方法进行数据处理分析。根据Boehm滴定法[14]测定水热炭表面官能团含量。
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