| 引用本文: | 甘国渝,金慧芳,李燕丽,等.秸秆及其生物炭添加对土壤Olsen-P及磷素组分的影响[J].灌溉排水学报,2023,42(5):43-51. |
| GAN Guoyu,JIN Huifang,LI Yanli,et al.秸秆及其生物炭添加对土壤Olsen-P及磷素组分的影响[J].灌溉排水学报,2023,42(5):43-51. |
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| 摘要: |
| 【目的】研究和对比秸秆和生物炭添加对土壤磷素及Olsen-P量变化的影响。【方法】以江汉平原典型水稻土为研究对象，进行了室内恒温土培试验。试验设置不同水分模拟旱地和水田两种土地利用方式，分别设置高量生物炭（BC2）、低量生物炭（BC1）、高量秸秆（SC2）、低量秸秆（SC1）和无添加（CK）处理，25 ℃下恒温培养30 d。利用Hedley磷素形态分级法对各处理土壤进行磷素分级，同时测定土壤Olsen-P量及其他理化指标。【结果】在旱地土壤中，添加生物炭使得土壤Olsen-P量增加了1.78~1.46 mg/kg，添加秸秆使得土壤Olsen-P量分别增加了4.46~1.72 mg/kg。在水田土壤中，添加生物炭使得土壤Olsen-P量分别增加了22.42~12.04 mg/kg，添加秸秆使得土壤Olsen-P量分别增加了6.37~4.27 mg/kg。磷素形态分级结果表明各处理土壤中不同磷素组分量差异较大，由高到低依次表现为HCl-P＞NaOH-P＞NaHCO3-P＞H2O-P。综合旱地和水田土壤来看，添加生物炭提高了土壤pH值、总氮（TN）、可溶性有机碳（DOC）和土壤总有机碳（SOC）量。而添加秸秆提高了土壤总磷（TP）、DOC和SOC量。添加生物炭处理土壤中，Olsen-P量与H2O-P、NaHCO3-P、SOC和NH4+-N量呈极显著正相关。添加秸秆处理土壤Olsen-P量与NaOH-P、HCl-P、TN和NH4+-N量呈显著正相关关系。【结论】可见，生物炭和秸秆还田主要是通过影响土壤pH、TN和SOC量，促进土壤中Olsen-P的积累，同时改变土壤的磷素分级状况，进而提高土壤供磷水平和能力。 |
| 关键词: 生物炭；秸秆；Hedley磷素形态分级法；Olsen-P |
| DOI：10.13522/j.cnki.ggps.2022289 |
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| Effects of Straw Incorporation and Biochar Amendment on Olsen-P and Phosphorus Fraction in Soil |
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GAN Guoyu, JIN Huifang, LI Yanli, Yang Jun, LI Jifu, YAO Rongjiang, YANG Jinsong, ZHU Hai
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1. College of Agriculture, Yangtze University/Engineering Research Center of Ecology and Agricultural Use of Wetland,
Ministry of Education, Jingzhou 434025, China; 2. Nanjing Soil Research Institute, Chinese Academy of Sciences/
State Key Laboratory of Soil and Agricultural Sustainable Development, Nanjing 210008, China
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| Abstract: |
| 【Objective】The low mobility of phosphorus in soil is a main factor limiting its bioavailability. In this paper. The efficacy of straw incorporation and biochar amendment in improving Olsen-P and changing P fraction is soil was studied.【Method】The study was based on incubation experiment. Soil taken from a rice field was used in experiments under two soil water contents to mimic paddy field and dried land, respectively. For each soil water treatment, there were four soil amendments: a high (BC2) and a low (BC1) biochar amendment, a high (SC2) and a low (SC1) straw incorporation. The control is without soil amendment (CK). The Hedley phosphorus speciation method was used to classify P fraction in each treatment, and the Olsen-P content and other soil physicochemical properties were measured using standard methods.【Result】Depending on its application rate, biochar amendment increased Olsen-P content in the dried soil and the paddy soil by 1.78 to 1.46 mg/kg and 12.04~22.42 mg/kg, respectively. Straw incorporation increased Olsen-P content in the dried soil and the paddy soil by 4.46~1.72 mg/kg and 6.37 to 4.27 mg/kg, respectively, also depending on its application amount. The phosphorus components varied with treatment but in all treatments, it was found that HCl-P>NaOH-P>NaHCO3-P>H2O-P. Biochar amendment increased soil pH, total nitrogen (TN), soluble organic carbon (DOC) and organic carbon (SOC) content, while straw incorporation increased soil total phosphorus (TP), DOC and SOC content. In soil amended with biochar, Olsen-P content was positively correlated with H2O-P, NaHCO3-P, SOC and NH4+-N, at significant level, while in soil amended with straw, Olsen-P content was positively correlated with NaOH-P, HCl-P, TN and NH4+-N, also at significant level. 【Conclusion】Biochar amendment and straw incorporation promoted accumulation of Olsen-P in the soils, primarily affected by change in soil pH, TN, and SOC, as well as the changes in phosphorus components. These enhanced the bioavailability of phosphorus. |
| Key words: biochar; straw; Hedley phosphorus classification method; Olsen-P |
