本文選題：黑土區(qū)　切入點(diǎn)：水稻土　出處：《水土保持學(xué)報(bào)》2016年04期 　論文類型：期刊論文

【摘要】：為研究黑土區(qū)水稻土水穩(wěn)性團(tuán)聚體有機(jī)碳及其顆粒有機(jī)碳含量和δ~(13) C值的分布特征,探討黑土區(qū)水稻土水穩(wěn)性團(tuán)聚體有機(jī)碳及其顆粒有機(jī)碳的分布和穩(wěn)定性,為該地區(qū)黑土的合理利用及土壤的合理培肥提供理論依據(jù),以黑土區(qū)不同有機(jī)碳含量的水稻土為研究對(duì)象,利用濕篩法和物理分組技術(shù)分離提取各級(jí)團(tuán)聚體及其顆粒有機(jī)物,采用~(13) C穩(wěn)定同位素質(zhì)譜技術(shù)分析有機(jī)碳含量及其δ~(13) C值。結(jié)果表明,黑土區(qū)水稻土以2~0.25mm團(tuán)聚體為主,土壤有機(jī)碳主要富集在0.25mm團(tuán)聚體中,尤其是2~0.25mm團(tuán)聚體中;團(tuán)聚體有機(jī)碳的δ~(13) C值隨團(tuán)聚體粒級(jí)的減小而增大,2mm和2~0.25mm團(tuán)聚體中有機(jī)碳的δ~(13) C值均小于土壤有機(jī)碳的δ~(13) C值,具有碳截獲或碳固定能力,而0.25~0.053mm和0.053mm團(tuán)聚體中有機(jī)碳的δ~(13) C值均大于土壤有機(jī)碳的δ~(13) C值,具有碳固持或穩(wěn)定的能力;除B-2土樣外,各土樣均以2~0.25mm團(tuán)聚體中的顆粒有機(jī)碳含量為最大,以0.25~0.053mm團(tuán)聚體中的顆粒有機(jī)碳含量為最小,且該團(tuán)聚體中顆粒有機(jī)碳含量與土壤有機(jī)碳含量呈顯著正相關(guān)關(guān)系(r=0.917,P0.01),表明微團(tuán)聚體閉蓄態(tài)的顆粒有機(jī)碳對(duì)土壤有機(jī)碳的固持和穩(wěn)定發(fā)揮重要作用。土壤顆粒有機(jī)碳及各級(jí)團(tuán)聚體中顆粒有機(jī)碳的δ~(13) C值均小于土壤有機(jī)碳及各粒級(jí)團(tuán)聚體中有機(jī)碳的δ~(13) C值,團(tuán)聚體顆粒有機(jī)碳的δ~(13) C值也隨團(tuán)聚體粒級(jí)的減小而增大。因此,黑土區(qū)水稻土中0.25mm的水穩(wěn)性團(tuán)聚體是有機(jī)碳的主要載體,團(tuán)聚體顆粒有機(jī)碳作為活性碳庫(kù),較總有機(jī)碳更易反映黑土區(qū)水稻土有機(jī)碳的周轉(zhuǎn)變化,其敏感性隨團(tuán)聚體粒級(jí)的增大而增強(qiáng)。
[Abstract]:In order to study the distribution characteristics of water stable aggregate organic carbon and its particulate organic carbon content and 未 ~ (13) C value of paddy soil in black soil area, the distribution and stability of water stable aggregate organic carbon and its particulate organic carbon in black soil were studied. This paper provides a theoretical basis for the rational utilization of black soil and the rational fertilization of soil. Taking paddy soil with different organic carbon content in black soil area as the research object, the aggregates and their particulate organic matter are separated and extracted by wet sieve method and physical grouping technique. The organic carbon content and 未 ~ (13) C value of paddy soil in black soil area were analyzed by using stable isotope mass spectrometry. The results showed that the rice soil in black soil was mainly composed of 0.25mm aggregate, and soil organic carbon was mainly enriched in 0.25mm aggregate, especially in 2o 0.25mm aggregate. The 未 ~ (13) C value of organic carbon in aggregates increased with the decrease of particle size of aggregates, and the 未 ~ (13) C values of organic carbon in aggregates of 2mm and 0.25mm were lower than those of soil organic carbon, and had the ability of carbon interception or carbon fixation. However, the 未 ~ (13) C values of organic carbon in 0. 25 ~ 0. 053 mm and 0. 053 mm aggregates were higher than those in soil organic carbon and had the ability of carbon sequestration or stabilization, except for B-2 soil samples, the content of particulate organic carbon in 2 ~ 0. 25 mm aggregate was the largest. The content of particulate organic carbon in 0.255mm agglomerate was the smallest. There was a significant positive correlation between particulate organic carbon content and soil organic carbon content in the aggregate, indicating that the closed particulate organic carbon of microaggregate plays an important role in soil organic carbon sequestration and stability. The 未 ~ (13) C values of carbon and particulate organic carbon in aggregates were lower than those of soil organic carbon and organic carbon in various aggregates, and the 未 ~ (13) C values of particulate organic carbon were lower than those of soil organic carbon and organic carbon. The 未 ~ (13) C value of aggregate particles also increases with the decrease of aggregate size. Therefore, the water-stable aggregate of 0.25 mm in paddy soil in black soil is the main carrier of organic carbon, and the aggregate particulate organic carbon is used as active carbon pool. Compared with the total organic carbon, the organic carbon turnover of paddy soil in black soil area was more easily reflected, and its sensitivity increased with the increase of aggregate grain size.
【作者單位】： 沈陽(yáng)農(nóng)業(yè)大學(xué)土地與環(huán)境學(xué)院農(nóng)業(yè)部東北耕地保育重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41571280,41101276)
【分類號(hào)】：S153.6

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