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本文采集公主岭市长期定位监测基地不施肥和施用不同化肥的黑土,通过超声波分散-离心分离得到细黏粒(<0.2μm)、粗黏粒(0.2～2μm)、粉粒(2～53μm)、细砂粒(53～250μm)、粗砂粒(250～2000μm)5个颗粒级别,分析全土及不同粒级中土壤碳水化合物并进行含量与分布的比较。结果表明,黑土中不同粒级碳水化合物库的性质差异显著,碳水化合物多集中在粉+黏粒中;长期施用化肥后,黑土全土及各粒级碳水化合物库大小和浓度基本上没有变化;粗砂粒级(Gal+Man)(:Ara+Xyl)下降,表明该粒级中植物来源碳水化合物所占比重有所增加,暗示出粗砂粒级对施肥措施更为敏感。
In this paper, black soil with different chemical fertilizers and fertilizers were applied in long-term monitoring and monitoring base of Gongzhuling city. Fine clay (<0.2μm), coarse clay (0.2μm ~ 2μm) Fine sand (53 ~ 250μm) and coarse sand (250 ~ 2000μm). The soil carbohydrates in different soil fractions and different fractions were analyzed and their contents and distributions were compared. The results showed that there were significant differences in the properties of different grain-size carbohydrate pools in black soil, with more carbohydrates concentrated in the powder and clay. After long-term application of fertilizers, the size and concentration of whole-grain and granular carbohydrate pools in black soil remained almost unchanged. The decrease of Gal + Man (Ara + Xyl) indicates that the proportion of plant-derived carbohydrates in the grain fraction has increased, suggesting that gritty fraction is more sensitive to fertilization.