| 李皓,赵子婧,戴相林,孙建平,李晓雪,姚玉涛,刘雅辉.改良剂等氮替代化肥对滨海盐渍土有机碳组分及微生物群落的影响[J].干旱地区农业研究,2026,(4):303~313 |
| 改良剂等氮替代化肥对滨海盐渍土有机碳组分及微生物群落的影响 |
| Effects of equal\|nitrogen substitution of chemical fertilizers with soil amendments on organic carbon fractions and microbial communities in coastal saline soil |
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| DOI：10.7606/j.issn.1000-7601.2026.04.29 |
| 中文关键词: 土壤改良剂 等氮替代 滨海盐渍土 有机碳组分 碳库管理指数 微生物群落 |
| 英文关键词:soil amendment equal\|nitrogen substitution coastal saline soil organic carbon fractions carbon pool management index microbial community |
| 基金项目:河北省农林科学院基本科研业务费青年项目（2025010103）；国家重点研发计划项目（2022YFD1900105） |
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| 中文摘要: |
| 为探究等氮条件下自研复合改良剂替代化肥氮对滨海盐渍土肥力及微生物生态的调控效果，以河北省曹妃甸区典型盐渍土为对象，设置0%（F，全量施用常规化肥）、10%（AF1）、30%（AF2）、50%（AF3）改良剂替代氮肥4个梯度，以不施氮肥处理为对照（CK），系统分析玉米不同生育时期土壤理化性状、有机碳组分及微生物群落结构的变化特征。结果表明，玉米成熟期，50%改良剂替代处理（AF3）改良盐碱、活化速效养分效果最优，其土壤含盐量较CK下降10.34%，土壤pH较F处理降低1.26%，有效磷、速效钾含量分别较F处理提升106.39%和23.87%。30%改良剂替代处理（AF2）固碳培肥与优化微生物群落综合效果最佳，其成熟期土壤总有机碳（TOC）、易氧化有机碳（EOC）、微生物量碳（MBC）及可溶性有机碳（DOC）分别较F处理提高27.22%、44.04%、18.95%和10.01%，碳库管理指数（CPMI）提高47.58%；AF2较F处理土壤细菌和真菌的ACE指数分别提升6.11%和14.97%，耐盐碱功能菌芽孢杆菌科相对丰度增加5.67%，土壤微生物群落β多样性发生显著分异。皮尔森相关性分析显示，土壤有机碳组分、pH、速效养分与优势菌科丰度高度相关。综上，30%改良剂等氮替代可显著提升土壤碳库储量，改善微生物群落结构，适合用于滨海盐渍土固碳培肥；50%改良剂等氮替代在降低土壤盐碱度、提升土壤速效磷钾养分方面优势突出，可针对性改良滨海重度盐渍土。 |
| 英文摘要: |
| To investigate the regulatory effects of equal\|nitrogen substitution of chemical fertilisers with a selfdeveloped composite soil amendment on soil fertility and microbial ecology of coastal saline soil, the typical saline soil in Caofeidian District, Hebei Province, was taken as the object, and four gradients of 0% (F, full application of conventional chemical fertilizers), 10% (AF1), 30% (AF2), and 50% (AF3) amendment were set to replace nitrogen fertilizer, and no nitrogen fertilizer treatment was used as the control (CK). The variation characteristics of soil physicochemical properties, organic carbon fractions, and microbial community structure were systematically characterised across different maize growth stages. The results showed that at the maturity stage of maize, the 50% amendment substitution treatment (AF3) had the best effect on improving saline\|alkali and activating available nutrients. The soil salt content decreased by 10.34% compared with CK, and the soil pH decreased by 1.26% compared with F treatment. The contents of soil available phosphorus and available potassium increased by 106.39% and 23.87%, respectively, compared with the F treatment. The 30% amendment substitution treatment (AF2) had the best comprehensive effect on carbon sequestration, soil fertility enhancement, and microbial community optimization. The soil total organic carbon (TOC), easily oxidisable organic carbon (EOC), microbial biomass carbon (MBC), and dissolved organic carbon (DOC) at maturity stage were 27.22%, 44.04%, 18.95%, and 10.01% higher than those of the F treatment, respectively. The carbon pool management index (CPMI) increased by 47.58%. Compared with F treatment, the abundance based coverage estimator (ACE) index of bacteria and fungi in AF2 increased by 6.11% and 14.97%, respectively, and the relative abundance of salt\| and alkali\|tolerant family Bacillaceae increased by 5.67%. The β diversity of the soil microbial community showed significant divergence. Pearson correlation analysis showed that soil organic carbon fractions, pH, and available nutrients were highly correlated with the abundance of dominant bacteria families. In conclusion, 30% equal\|nitrogen substitution with the composite amendment can significantly increase soil carbon storage and improve microbial community structure, which is suitable for carbon sequestration and fertilization of coastal saline soil. 50% equal\|nitrogen substitution with the composite amendment has outstanding advantages in reducing soil salinity and improving soil available phosphorus and potassium nutrients, which can be targeted to impove costal servere saline soil. |
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