湖南农业大学学报（自然科学版）2025，Vol.51Issue(2)：68-79,12.
生物炭-城市污水厂污泥堆肥复合改良剂对盐渍土壤的改良效果
Improving salt-affected soil using a biochar-municipal sewage sludge compost composite amendment
摘要
Abstract
Two composite soil amendments were prepared by blending waste wood-derived biochar(WBC)and municipal sewage sludge compost(SS)with polyacrylamide(PAM)and nano-silica(SiO2-NPs)at the mass ratios of 42.5∶42.5∶4∶11(BCS1)and 42.5∶42.5∶8∶7(BCS2),respectively.The effects of WBC,SS,BCS1 and BCS2 on oil sunflower(Helianthus annuus L.,a typical salt-tolerant commercial crop)growth and salt-affected soil(collected from the Yellow River Delta)remediation were evaluated via pot experiment.The results showed that the composite amendments prepared by combining WBC and SS effectively integrated carbon sequestration,nutrient regulation,and structural optimization.The directional loading of SiO2-NPs and PAM reconstructed surface functional groups(e.g.,Si—O—-Si and C=O bonds),leading to distinct physicochemical properties of BCS1 and BCS2 compared with WBC and SS alone.BCS2 exhibited better water retention performance,increasing the soil maximum water holding capacity(WHC)by 11.32%compared with the blank treatment without amendment(CK),which effectively improved the soil water retention.Compared with CK,the addition of 4 amendments promoted the photosynthesis and growth of oil sunflower,with leaf SPAD significantly increasing by 6.83%-11.44%.Compared with WBC and SS,BCS1 and BCS2 had stronger promoting effects on photosynthesis.The effect of BCS2 on plant growth was better than that of BCS1.The addition of BCS2 significantly increased the stem diameter by 19.57%and the number of root tips by 238.13%.These effects were mainly attributed to improve soil aggregate stability(the mean weight diameter of rhizosphere and non-rhizosphere soil aggregates of BCS2 increased by 18.18%and 18.98%)and enhance water and nutrient availability,resulting in significantly increases in available phosphorus(AP)in rhizosphere and non-rhizosphere soils by 25.36%-84.22%and 12.45%-64.63%,respectively,thereby improving soil health.Furthermore,the results of structural equation model analysis revealed that amendments indirectly enhanced plant growth primarily by increasing WHC,followed by soil nitrogen,carbon,and aggregate stability.It could be seen that the composite amendments prepared from WBS and SS products demonstrated high potential for coastal salt-affected soil remediation.关键词
油葵/盐渍土壤/土壤健康/生物炭/污泥堆肥/纳米材料Key words
oil sunflower/salt-affected soil/soil health/biochar/sludge compost/nanomaterial分类
农业科学引用本文复制引用
于丽明,初正崑,袁延飞,陈姝谚,郑浩..生物炭-城市污水厂污泥堆肥复合改良剂对盐渍土壤的改良效果[J].湖南农业大学学报（自然科学版）,2025,51(2):68-79,12.基金项目
青岛水务集团有限公司科技创新项目(20220293) （20220293）
山东省重点研发计划项目(2022SFGC0302) （2022SFGC0302）
山东省杰出青年基金项目(ZR2021JQ13) （ZR2021JQ13）
