【摘要】：土壤有機(jī)質(zhì)(SOM)對(duì)于維持農(nóng)業(yè)生產(chǎn)力、提高土壤質(zhì)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(zhǎng)期定位試驗(yàn)為依托,借助近期發(fā)展的物理 化學(xué)聯(lián)合分組方法,探討了長(zhǎng)期施肥對(duì)水稻土不同功能SOM庫(kù)含量、SOM庫(kù)碳氮含量變化和分配比例的影響。結(jié)果表明,長(zhǎng)期施肥尤其是有機(jī)無(wú)機(jī)配施處理顯著增加了未保護(hù)游離SOM庫(kù)(c POM和f POM)和純物理保護(hù)SOM庫(kù)(i POM)在土壤中的含量以及它們的土壤有機(jī)碳(SOC)和全氮(TN)含量。未保護(hù)游離SOM庫(kù)的SOC和TN含量占總有機(jī)碳和全氮比例在有機(jī)無(wú)機(jī)配施處理下最高,分別達(dá)35.9%和33%。與CK相比,有機(jī)無(wú)機(jī)配施使生物化學(xué)保護(hù)庫(kù)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(xué)保護(hù)SOM庫(kù)、物理 生物化學(xué)保護(hù)SOM庫(kù)以及化學(xué)保護(hù)SOM庫(kù)含量受長(zhǎng)期施肥影響不顯著。綜上,研究表明土壤不同功能SOM庫(kù)對(duì)長(zhǎng)期施肥的響應(yīng)不同。有機(jī)無(wú)機(jī)配施是提升紅壤水稻土SOM數(shù)量和質(zhì)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(xué)城市與環(huán)境學(xué)院;中國(guó)科學(xué)院地理科學(xué)與資源研究所生態(tài)系統(tǒng)網(wǎng)絡(luò)觀測(cè)與模擬重點(diǎn)實(shí)驗(yàn)室;國(guó)家紅壤改良工程技術(shù)研究中心/江西省紅壤研究所/農(nóng)業(yè)部江西耕地保育科學(xué)觀測(cè)實(shí)驗(yàn)站;中國(guó)農(nóng)業(yè)科學(xué)院農(nóng)業(yè)環(huán)境與可持續(xù)發(fā)展研究所;賀州學(xué)院化學(xué)與生物工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(31400460,31420103917)資助~~
【分類(lèi)號(hào)】：S153.6

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