【摘要】：以陜西安塞自然植被土壤和農(nóng)田土壤(包括施有機(jī)肥、施無機(jī)肥、不施肥對照)為研究對象,通過分析各粒級團(tuán)粒中有機(jī)質(zhì)和碳酸鈣的分布特征及去除膠結(jié)物質(zhì)前后的粒度組成,探討不同農(nóng)業(yè)利用條件對黃土團(tuán)聚特征的影響。結(jié)果表明:不同利用方式下的土壤均以粒徑0.05 mm(45%~65%)和粒徑0.002~0.05 mm(30%~45%)的團(tuán)粒為主;相對于自然土壤,農(nóng)業(yè)活動對粗粒級團(tuán)粒中碳酸鈣的溶解再沉淀過程具有促進(jìn)作用,增加粒徑0.002mm次生碳酸鈣含量;不施肥和施用無機(jī)肥顯著降低粒徑0.002 mm團(tuán)粒的有機(jī)質(zhì)含量,而施用有機(jī)肥顯著增加粒徑0.05mm和粒徑0.002mm團(tuán)粒的有機(jī)質(zhì)含量,有利于大團(tuán)聚體(250~1 000μm)的形成;逐步去除膠結(jié)物質(zhì)過程中,不同利用方式的土壤團(tuán)粒逐漸破碎,粒度分布曲線和累計曲線均向左不同程度推移。不同利用方式的土壤中碳酸鈣和有機(jī)質(zhì)均對土壤顆粒產(chǎn)生膠結(jié)作用,且施用有機(jī)肥的土壤中碳酸鹽和有機(jī)質(zhì)的膠結(jié)團(tuán)聚作用最強(qiáng)。
[Abstract]:The natural vegetation soil and farmland soil (including organic fertilizer, inorganic fertilizer, no fertilization control) in Ansai, Shaanxi Province, were studied. By analyzing the distribution characteristics of organic matter and calcium carbonate in various granular grains and the particle size composition before and after removal of cemented matter, the effects of different agricultural utilization conditions on the characteristics of loess agglomeration were discussed. The results showed that the soil was mainly composed of 0. 05 mm (45 ~ 65%) and 0. 002 0. 05 mm (30 ~ 45%), compared with the natural soil, agricultural activities promoted the dissolution and reprecipitation of calcium carbonate in coarse granular. Increasing the content of secondary calcium carbonate in particle size 0.002mm, decreasing the content of organic matter in 0.002 mm particle without fertilization and applying inorganic fertilizer, and increasing the content of organic matter in 0.05mm and 0.002mm particles of particle size significantly by applying organic fertilizer. It is favorable to the formation of large aggregates (250 ~ 1 000 渭 m), and in the process of gradually removing cementation materials, the soil aggregates with different utilization modes are gradually broken, and the particle size distribution curves and accumulative curves are all moving to the left to different degrees. Calcium carbonate and organic matter in different utilization modes of soil all produced cementation on soil particles, and the cementation and agglomeration of carbonate and organic matter in soil with organic fertilizer was the strongest.
【作者單位】： 華中農(nóng)業(yè)大學(xué)農(nóng)業(yè)部長江中下游耕地保育重點(diǎn)實(shí)驗(yàn)室;中科院水利部水土保持研究所/黃土高原土壤侵蝕與旱地農(nóng)業(yè)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項目(41201230;41330852)
【分類號】：S152.4

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