摘要
为改善砂姜黑土质量和土壤结构,以砂姜黑土为试验材料,通过土柱培养试验,共设置CK(不施加生物炭)、B1(1%生物炭,生物炭质量占其与土壤质量之和的比例,下同)、B3(3%生物炭)和B6(6%生物炭)4个处理,研究不同生物炭施加量对砂姜黑土团聚体稳定性特征及有机碳分布的影响。结果表明:与CK相比,B3和B6处理显著提高了1~2 mm粒径土壤团聚体含量,提升幅度为57.89%~78.95%;B6处理显著增加了>2 mm粒径土壤团聚体含量,增量为44.44%,但降低了<0.053 mm粒径团聚体含量。与CK相比,B3处理显著提高了土壤团聚体平均重量直径(MWD)和几何平均直径(GMD),提升幅度分别为16.25%和22.64%;B6处理显著提高>0.25 mm粒径团聚体含量(R0.25)、MWD和GMD,提升幅度分别为6.15%、23.75%和33.96%,但分形维数(D)降低5.44%。与CK相比,B3和B6处理均显著促进了土壤总有机碳(SOC)含量的积累,分别提高66.37%和162.85%;B1和B3处理显著提高了<0.053 mm粒径团聚体有机碳贡献率,分别提升105.45%和74.88%;B6处理显著提高了1~2 mm粒径团聚体有机碳贡献率,增量为59.46%。生物炭不同施用量处理均显著提高了<0.053 mm粒径团聚体有机碳含量,表现为B6>B3>B1,并显著提高0.5~1 mm和0.053~0.25 mm粒径团聚体易氧化有机碳(EOC)含量。土壤SOC和R0.25、GMD和MWD呈显著正相关关系,与D值呈显著负相关关系(P<0.05)。综上,施加3%和6%生物炭处理能显著促进砂姜黑土中水稳性大团聚体的形成,提高SOC和EOC含量,进而改善土壤结构,提升土壤质量,有利于砂姜黑土障碍因子的消减。
In this study,the effects of biochar application rate on soil aggregate stability and organic carbon distribution in Shajiang black soil were investigated,and the results can provide scientific support for improving the quality and soil structure of Shajiang black soil.Four treatments,CK(no biochar),B1(1%biochar,biochar accounts for 1%of the total weight of biochar and soil,the same below),B3(3%biochar),and B6(6%biochar)were set up in a soil column incubation test using Shajiang black soil as the experimental material.The results showed that,compared with CK,B3 and B6 treatments significantly increased the 1~2 mm agglomerate content by 57.89%to 78.95%.B6 treatment significantly increased the>2 mm agglomerate content by 44.44%,but decreased the<0.053 mm agglomerate content.Compared to CK,B3 treatment significantly increased mean weight diameter(MWD)and geometric mean diameter(GMD)by 16.25%and 22.64%,respectively,and B6 treatment significantly increased the>0.25 mm agglomerate content(R 0.25),MWD,and GMD by 6.15%,23.75%,and 33.96%,respectively,but decreased fractal dimension(D)by 5.44%.Compared to CK,B3 and B6 treatments significantly promoted total soil organic carbon(SOC)accumulation by 66.37%and 162.85%,respectively.B1 and B3 treatments significantly increased the organic carbon contribution of the<0.053 mm aggregates by 105.45%and 74.88%,respectively,while the B6 treatment significantly increased the organic carbon contribution of 1~2 mm aggregates by 59.46%.Different biochar application rates treatments significantly increased the organic carbon content of the<0.053 mm agglomerates as B6>B3>B1 and significantly increased the easily oxidized organic carbon(EOC)content of the 0.5~1 mm and the 0.053~0.25 mm agglomerates.SOC exhibited a significant positive correlation with R 0.25,GMD,and MWD,while it had a significant negative correlation with D value(P<0.05).In conclusion,the application of 3%and 6%biochar significantly promoted the formation of water-stable macroaggregates as well as the increase of SOC and EOC content,which improved the soil structure,enhanced the soil quality,and facilitated the abatement of obstacle factors in Shajiang black soil.
作者
何小妹
江昱琳
张洛涵
高磊
孔海燕
HE Xiaomei;JIANG Yulin;ZHANG Luohan;GAO Lei;KONG Haiyan(College of Resources and Environment,Anhui Agricultural University,Hefei,Anhui 230036,China)
出处
《干旱地区农业研究》
北大核心
2025年第4期70-78,共9页
Agricultural Research in the Arid Areas
基金
国家自然科学基金(32101316)
安徽省教育厅高校中青年教师培养行动项目(YQYB2023002)。
关键词
生物炭
土壤团聚体
土壤有机碳
易氧化有机碳
砂姜黑土
biochar
soil aggregate
soil organic carbon
easily oxidized organic carbon
Shajiang black soil
