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秸秆生物炭对砂姜黑土有机磷组分含量的影响
张睿,王童语,王道中,郭志彬,朱林,花可可
0
(安徽农业大学资源与环境学院,合肥 230031; 安徽省农业科学院土壤肥料研究所,合肥 230031; 养分循环与资源环境安徽省重点实验室,合肥 230031)
摘要:
研究秸秆生物炭对砂姜黑土有机磷组分及分配的影响,对剖析土壤磷循环机制和农田磷管理有重要意义。依托砂姜黑土定位试验,分析不施肥(CK)、常规施肥(NPK)、化肥与6.0、12、36和48 t·hm-2小麦秸秆生物炭一次性增施(BC6、BC12、BC36和BC48)6个处理对作物产量、土壤理化性质及有机磷组分的影响。结果表明,与NPK处理相比,增施秸秆生物炭均可保障小麦和玉米产量,并显著增加(P < 0.05)土壤有机碳、全氮和pH,提升土壤肥力和缓解土壤酸化;砂姜黑土有机磷以中等活性有机磷为主(37.4%~45.4%),其分配比例因秸秆生物炭施用量的不同而呈现差异。BC6、BC12、BC36和BC48处理土壤活性有机磷含量分别为11.4、10.7、9.2和9.3 mg·kg-1,分别较NPK处理下降8.8%、14.4%、26.4%和25.6%,差异显著(P<0.05),且土壤活性有机磷含量与生物炭施用量呈显著线性负相关(R2 = 0.881 6,P<0.05)。增施秸秆生物炭处理(BC6、BC12、BC36和BC48)土壤活性有机磷所占比例较NPK处理均显著降低(P<0.05),这说明增施秸秆生物炭除了可有效提升土壤肥力水平、缓解土壤酸化之外,还可有效降低土壤有机磷活性,增强有机磷稳定性,保障作物产量,其中以一次性增施36 t·hm-2效果最好,宜在砂姜黑土区广泛应用。
关键词:  秸秆炭化还田  有机磷活性  有机磷稳定性  磷管理
DOI:10.13610/j.cnki.1672-352x.20220705.009
基金项目:安徽省自然基金面上项目(2008085MD108)和安徽省科技重大专项项目(201903a06020028)共同资助。
Effects of straw biochar application on organic phosphorus fractions and distribution in lime concretion black soil
ZHANG Rui,WANG Tongyu,WANG Daozhong,GUO Zhibin,ZHU Lin,HUA Keke
(School of Resources and Environment, Anhui Agricultural University, Hefei 230036; Institute of Soil and Fertilizer Research, Anhui Academy of Agricultural Sciences, Hefei 230031; Anhui Key Laboratory of Nutrient Cycling, Resources and Environment, Hefei 230031)
Abstract:
Understanding the effects of straw biochar on soil organic phosphorus fractions and distribution in lime concretion black soil is of great significance to analyze the soil phosphorus cycle mechanism and excavate the availability of soil phosphorus pool. In this study, the effects of no fertilization (CK), conventional fertilization (NPK), chemical fertilizer and one-time addition of wheat straw biochar (BC6, BC12, BC36 and BC48) on crop yield, soil physicochemical properties and organic phosphorus components were analyzed based on field experiments on lime concretion black soil. The results showed that, compared with NPK treatment, increased application of straw biochar could guarantee wheat and maize yields, significantly increase (P < 0.05) the soil organic carbon, total nitrogen and pH, and improve the soil fertility and alleviate the soil acidification. The proportion of organic phosphorus in lime concretion black soil was mainly medium labile organic phosphorus (37.4% - 45.4%). The proportion of organic phosphorus in lime concretion black soil was different with different application amount of straw biochar. The contents of labile soil organic phosphorus in BC6, BC12, BC36 and BC48 treatments were 11.4, 10.7, 9.2 and 9.3 mg·kg-1, respectively, which were 8.8%, 14.4%, 26.4% and 25.6% lower than that in NPK treatment, respectively. The difference was striking (P < 0.05). There was a significant negative linear correlation between the soil labile organic phosphorus content and the application amount of biochar (R2 = 0.881 6, P < 0.05). Increasing straw biochar application processing (BC6, BC12, BC36 and BC48) and the proportion of soil labile organic phosphorus in NPK treatment were significantly decreased (P < 0.05), suggesting that increasing straw biochar could effectively enhance the level of the soil fertility, soil acidification
Key words:  straw charred and returned to the field  organic phosphorus activity  organic phosphorus stability  phosphorus management

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