【摘要】 应用生物腐植酸对新疆甘草产地沙退化土壤进行了改良,研究了施用生物腐植酸后第90~190天内土壤全氮和有机碳含量的动态变化,并对第190天时土壤其他各主要养分指标的变化进行了分析,最后通过主成分聚类分析法对第190天时生物腐植酸的修复效果进行了综合评价。结果表明:施用生物腐植酸可以在190d内显著提高土壤全氮和有机碳等主要养分含量,最佳施用量为450kg.hm-2,土壤全氮、有机碳、碱解氮、速效磷、速效钾、土壤可提取腐殖质碳、富里酸碳和胡敏酸碳含量分别比对照提高了21.6%、15.9%、36.6%、20.0%、13.9%、21.0%、17.4%和25.2%。主成分分析结果显示,按不同施用量生物腐植酸的修复效果进行排序,为450kg.hm-2>750kg.hm-2>600kg.hm-2>300kg.hm-2>150kg.hm-2>CK。更多还原

【Abstract】 Bioactive humic substances(BHS) were applied to restore the desertified soil in Xinjiang Glycyrrhiza uralensis production area.The dynamic change of soil total nitrogen and organic carbon contents during the 90th and 190th day after application of BHS was studied,followed by analysis on the change of other soil nutrients contents.Comprehensive evaluation of the restoration effects!of BHS was analyzed by principal component and cluster analysis method.The results showed that BHS could improve significantly soil main nutrients contents within 190 days and the optimal application rate was 450kg·ha-1.The content of soil total nitrogen,organic carbon,available nitrogen,available phosphorus,available potassium,extractable humic substance carbon,fulvic acid carbon and humic acid carbon improved by 21.6%,15.9%,36.6%,20.0%,13.9%,21.0%,17.4% and 25.2% respectively comparing with CK.The restoration effect with different application rates of BHS,according to principal component method,ranked as follows: 450kg·ha-1> 750kg·ha-1> 600kg·ha-1>300kg·ha-1>150kg·ha-1>CK.更多还原