长期施肥对水稻土不同功能有机质库碳氮分布的影响
发布时间：2019-02-25 20:47
【摘要】：土壤有机质(SOM)对于维持农业生产力、提高土壤质量和增加土壤固碳均具有非常重要的意义。以红壤水稻土35年的长期定位试验为依托,借助近期发展的物理 化学联合分组方法,探讨了长期施肥对水稻土不同功能SOM库含量、SOM库碳氮含量变化和分配比例的影响。结果表明,长期施肥尤其是有机无机配施处理显著增加了未保护游离SOM库(c POM和f POM)和纯物理保护SOM库(i POM)在土壤中的含量以及它们的土壤有机碳(SOC)和全氮(TN)含量。未保护游离SOM库的SOC和TN含量占总有机碳和全氮比例在有机无机配施处理下最高,分别达35.9%和33%。与CK相比,有机无机配施使生物化学保护库非水解游离粉粒组(NH-d Slit)和非水解游离黏粒组(NH-d Clay)含量分别降低了15%和9.5%(p0.05)。物理 化学保护SOM库、物理 生物化学保护SOM库以及化学保护SOM库含量受长期施肥影响不显著。综上,研究表明土壤不同功能SOM库对长期施肥的响应不同。有机无机配施是提升红壤水稻土SOM数量和质量的最佳培肥措施。
[Abstract]:Soil organic matter (SOM) plays an important role in maintaining agricultural productivity, improving soil quality and increasing soil carbon sequestration. Based on the 35-year long-term localization experiment of paddy soil in red soil, the effects of long-term fertilization on the content of SOM bank, carbon and nitrogen content and distribution ratio of SOM pool in paddy soil were studied by means of the combined grouping method of physics and chemistry developed in recent years. The results show that Long-term fertilization, especially organic-inorganic combination treatment, significantly increased the contents of unprotected free SOM pool (c POM and f POM) and pure physically protected SOM pool (i POM) in soil and their soil organic carbon (SOC) and total nitrogen (TN) contents. The ratio of SOC and TN to total organic carbon and total nitrogen in unprotected free SOM storage was the highest (35.9% and 33% respectively) under organic and inorganic treatments. Compared with CK, the content of non-hydrolyzed free powder (NH-d Slit) and non-hydrolyzed free clay (NH-d Clay) decreased by 15% and 9.5% (p0.05), respectively. The contents of physical and chemical protected SOM, physical and biochemical protected SOM and chemical protected SOM were not significantly affected by long-term fertilization. On the whole, the results showed that the response of soil functional SOM banks to long-term fertilization was different. The combination of organic and inorganic application is the best measure to improve the quantity and quality of SOM in red soil paddy soil.
【作者单位】： 西北大学城市与环境学院;中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室;国家红壤改良工程技术研究中心/江西省红壤研究所/农业部江西耕地保育科学观测实验站;中国农业科学院农业环境与可持续发展研究所;贺州学院化学与生物工程学院;
【基金】：国家自然科学基金项目(31400460,31420103917)资助~~
【分类号】：S153.6
[Abstract]:Soil organic matter (SOM) plays an important role in maintaining agricultural productivity, improving soil quality and increasing soil carbon sequestration. Based on the 35-year long-term localization experiment of paddy soil in red soil, the effects of long-term fertilization on the content of SOM bank, carbon and nitrogen content and distribution ratio of SOM pool in paddy soil were studied by means of the combined grouping method of physics and chemistry developed in recent years. The results show that Long-term fertilization, especially organic-inorganic combination treatment, significantly increased the contents of unprotected free SOM pool (c POM and f POM) and pure physically protected SOM pool (i POM) in soil and their soil organic carbon (SOC) and total nitrogen (TN) contents. The ratio of SOC and TN to total organic carbon and total nitrogen in unprotected free SOM storage was the highest (35.9% and 33% respectively) under organic and inorganic treatments. Compared with CK, the content of non-hydrolyzed free powder (NH-d Slit) and non-hydrolyzed free clay (NH-d Clay) decreased by 15% and 9.5% (p0.05), respectively. The contents of physical and chemical protected SOM, physical and biochemical protected SOM and chemical protected SOM were not significantly affected by long-term fertilization. On the whole, the results showed that the response of soil functional SOM banks to long-term fertilization was different. The combination of organic and inorganic application is the best measure to improve the quantity and quality of SOM in red soil paddy soil.
【作者单位】： 西北大学城市与环境学院;中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室;国家红壤改良工程技术研究中心/江西省红壤研究所/农业部江西耕地保育科学观测实验站;中国农业科学院农业环境与可持续发展研究所;贺州学院化学与生物工程学院;
【基金】：国家自然科学基金项目(31400460,31420103917)资助~~
【分类号】：S153.6
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