【摘要】：土壤有機質(SOM)對于維持農業(yè)生產力、提高土壤質量和增加土壤固碳均具有非常重要的意義。以紅壤水稻土35年的長期定位試驗為依托,借助近期發(fā)展的物理 化學聯合分組方法,探討了長期施肥對水稻土不同功能SOM庫含量、SOM庫碳氮含量變化和分配比例的影響。結果表明,長期施肥尤其是有機無機配施處理顯著增加了未保護游離SOM庫(c POM和f POM)和純物理保護SOM庫(i POM)在土壤中的含量以及它們的土壤有機碳(SOC)和全氮(TN)含量。未保護游離SOM庫的SOC和TN含量占總有機碳和全氮比例在有機無機配施處理下最高,分別達35.9%和33%。與CK相比,有機無機配施使生物化學保護庫非水解游離粉粒組(NH-d Slit)和非水解游離黏粒組(NH-d Clay)含量分別降低了15%和9.5%(p0.05)。物理 化學保護SOM庫、物理 生物化學保護SOM庫以及化學保護SOM庫含量受長期施肥影響不顯著。綜上,研究表明土壤不同功能SOM庫對長期施肥的響應不同。有機無機配施是提升紅壤水稻土SOM數量和質量的最佳培肥措施。
[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.
【作者單位】： 西北大學城市與環(huán)境學院;中國科學院地理科學與資源研究所生態(tài)系統(tǒng)網絡觀測與模擬重點實驗室;國家紅壤改良工程技術研究中心/江西省紅壤研究所/農業(yè)部江西耕地保育科學觀測實驗站;中國農業(yè)科學院農業(yè)環(huán)境與可持續(xù)發(fā)展研究所;賀州學院化學與生物工程學院;
【基金】：國家自然科學基金項目(31400460,31420103917)資助~~
【分類號】：S153.6

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