| 高磷小麦秸秆提高砂姜黑土磷有效性并促进土壤磷素的转化 |
| |
| 引用本文： | 查庆南,申昊,李虹颖,熊启中,徐刚,田达,马超,李军利,郜红建,叶新新.高磷小麦秸秆提高砂姜黑土磷有效性并促进土壤磷素的转化[J].植物营养与肥料学报,2022,28(11):2001-2010. |
| |
| 作者姓名： | 查庆南 申昊 李虹颖 熊启中 徐刚 田达 马超 李军利 郜红建 叶新新 |
| |
| 作者单位： | 1.安徽农业大学资源与环境学院 / 安徽省绿色磷肥智能制造与高效利用工程研究中心 / 农田生态保育与污染防控安徽省重点实验室 / 江淮耕地资源保护与生态修复重点实验室，安徽合肥 230036 |
| |
| 基金项目： | 安徽省杰出青年科学基金项目(2008085J13)；安徽省科技重大专项(202103a06020012)；安徽省自然资源科技项目(2021-K-4)。 |
| |
| 摘 要： | 【目的】 研究不同含磷量的小麦秸秆还田对土壤磷素有效性的影响及其机理，为秸秆还田促进砂姜黑土磷素高效利用提供理论支撑。 【方法】 采用室内模拟培养试验方法，供试土壤为砂姜黑土。高磷和低磷小麦秸秆取自长期定位试验的施磷和空白对照小区，小麦秸秆含磷量分别为2.17、0.51 mg/kg。培养试验设不添加秸秆对照(CK)、添加低磷小麦秸秆(LS)、添加高磷小麦秸秆(HS) 3个处理，保持70%田间持水量，25℃下恒温培养90 天。在培养0、3、7、15、30、60、90 天时，测定土壤Olsen-P、无机磷组分、有机磷组分、磷酸酶活性、解磷菌数量、土壤微生物量磷(MBP)，计算土壤MBP的周转量和周转率。 【结果】 土壤Olsen-P含量随培养时间增加，在培养第15 天达到稳定。培养90 天时，HS处理Olsen-P含量比CK提高了59.4%，而LS处理土壤Olsen-P含量比CK降低了23.9% (P<0.05)。培养90天时，HS和LS处理土壤Ca10-P和Fe-P含量均显著低于CK处理，而Ca8-P含量显著高于CK处理，HS处理的Ca2-P含量显著高于LS和CK处理，而LS和CK处理Ca2-P含量无显著差异。与CK处理相比较，LS和HS处理土壤活性有机磷(LOP)和中等活性有机磷(MLOP)含量显著提高，而中等稳定性有机磷(MSOP)含量显著降低，3个处理间高稳定性有机磷(HSOP)含量无显著差异。HS处理的LOP含量比LS和CK处理分别提高了37%和158%。HS和LS处理均促进了MSOP向LOP和MLOP形态转化。秸秆还田增加了土壤中解有机和无机磷细菌数量以及土壤磷酸酶活性。添加秸秆后增加了土壤MBP的累积同化量、累积矿化量、周转量和周转强度，HS处理的提升效果高于LS处理。HS处理下MBP的周转期较LS处理短。 【结论】 高磷小麦秸秆施用更有利于土壤中Ca10-P和Fe-P向Ca2-P和Ca8-P的有效转化，更有效提升了微生物量磷的矿化和周转，提高砂姜黑土潜在的供磷能力。因此，高磷小麦秸秆还田可增加砂姜黑土磷的有效性，而低磷小麦秸秆还田可能会降低砂姜黑土磷的有效性。
|
| 关 键 词： | 秸秆还田 秸秆含磷量 砂姜黑土 无机磷转化 有机磷活化 微生物量磷周转 |
| 收稿时间： | 2022-02-17 |
High-P wheat straw increases the availability and turnover of phosphorus in lime concretion black soil |
| |
| ZHA Qing-nan,SHEN Hao,LI Hong-ying,XIONG Qi-zhong,XU Gang,TIAN Da,MA Chao,LI Jun-li,GAO Hong-jian,YE Xin-xin.High-P wheat straw increases the availability and turnover of phosphorus in lime concretion black soil[J].Plant Nutrition and Fertilizer Science,2022,28(11):2001-2010. |
| |
| Authors: | ZHA Qing-nan SHEN Hao LI Hong-ying XIONG Qi-zhong XU Gang TIAN Da MA Chao LI Jun-li GAO Hong-jian YE Xin-xin |
| |
| Institution: | 1.College of Resources and Environment, Anhui Agricultural University / Anhui Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer / Key Laboratory of Farmland Ecological Conservation and Pollution Prevention / Key Laboratory of Jianghuai Arable Land Resources Protection and Eco-Restoration, Hefei, Anhui 230036, China |
| |
| Abstract: | 【Objectives】 We investigated the effects of wheat straw with high and low phosphorus (P) contents on soil P availability, microbial biomass P (MBP), and the turnover of microbial biomass P, to provide a theoretical support for nutrient management under straw returning system. 【Methods】 An incubation microcosm experiment was carried out using lime concretion black soil. The P content in high and low P wheat straws was 2.17, 0.51 mg/kg, respectively, from the plots of no fertilizer control and P application treatment in a long-term field experiment. The incubation experiment had three treatments–no straw control (CK), adding low-P wheat straw (LS), and adding high-P wheat straw (HS), and lasted 90 days under 70% of field water capacity at 25℃. Soil samples were collected at 0, 3, 7, 15, 30, 60, and 90 days of incubation for the determination of Olsen-P, inorganic P and organic P components, phosphatase activity, the number of phosphate solubilizing bacteria, soil microbial biomass P (MBP). The turnover characteristics of soil MBP were calculated. 【Results】 The Olsen-P content in the three treatments increased within the first 15 days of incubation, and then kept stable. After 90 days of incubation, compared with CK, HS treatment significantly increased Olsen-P content by 59.4% but LS decreased that by 23.9% (P<0.05). The Ca10-P and Fe-P in both HS and LS treatments were lower, while Ca8-P were significantly higher than in CK. The Ca2-P in HS treatment was significantly higher than those in LS and CK, while Ca2-P in LS and CK were similar. Compared with CK, the labile organic P (LOP) and medium labile organic P (MLOP) in both LS and HS treatment were significantly enhanced but the medium stability organic P (MSOP) decreased, the high stability organic P (HSOP) content was similar in the three treatments. The LOP content in HS treatment was 37% and 158% higher than in LS and CK. Both HS and LS treatment stimulated the transformation of MSOP to LOP and MLOP, increased the number of organic and inorganic P-dissolving bacteria and soil phosphatase activity, increased the cumulative assimilation and mineralization, and the turnover intensity of soil MBP. HS had better effect than LS and resulted in shorter MBP turnover time. 【Conclusions】 High-P-straw is more beneficial for the transformation of Ca10-P and Fe-P to Ca2-P and Ca8-P, and the mineralization and turnover of microbial biomass P. Therefore, incorporation of high-P straw increase the availability of P in lime concretion black soil while low-P-straw incorporation decrease it. |
| |
| Keywords: | |
|
| 点击此处可从《植物营养与肥料学报》浏览原始摘要信息 |
| 点击此处可从《植物营养与肥料学报》下载免费的PDF全文 |
|
