不同农业利用条件对黄土胶结物质组成与团聚特征的影响

发布时间：2018-10-09 17:16

【摘要】：以陕西安塞自然植被土壤和农田土壤(包括施有机肥、施无机肥、不施肥对照)为研究对象,通过分析各粒级团粒中有机质和碳酸钙的分布特征及去除胶结物质前后的粒度组成,探讨不同农业利用条件对黄土团聚特征的影响。结果表明:不同利用方式下的土壤均以粒径0.05 mm(45%~65%)和粒径0.002~0.05 mm(30%~45%)的团粒为主;相对于自然土壤,农业活动对粗粒级团粒中碳酸钙的溶解再沉淀过程具有促进作用,增加粒径0.002mm次生碳酸钙含量;不施肥和施用无机肥显著降低粒径0.002 mm团粒的有机质含量,而施用有机肥显著增加粒径0.05mm和粒径0.002mm团粒的有机质含量,有利于大团聚体(250~1 000μm)的形成;逐步去除胶结物质过程中,不同利用方式的土壤团粒逐渐破碎,粒度分布曲线和累计曲线均向左不同程度推移。不同利用方式的土壤中碳酸钙和有机质均对土壤颗粒产生胶结作用,且施用有机肥的土壤中碳酸盐和有机质的胶结团聚作用最强。
[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.
【作者单位】：华中农业大学农业部长江中下游耕地保育重点实验室;中科院水利部水土保持研究所/黄土高原土壤侵蚀与旱地农业国家重点实验室;
【基金】：国家自然科学基金项目(41201230;41330852)
【分类号】：S152.4

【相似文献】