葡聚糖改性尿素在潮土中的转化特征

doi:10.3864/j.issn.0578-1752.2026.05.010

Abstract

Abstract:

【Objective】 Sugars regulate the nitrogen transformation process in soil. However, the effects of different polymerization degrees of dextran on nitrogen conversion were not clear. This study focused on investigating the transformation characteristics of dextran-modified urea with varying degrees of polymerization in calcareous fluvo-aquic soil, analyzing the relationship between the polymerization degree of dextran and nitrogen efficiency, and revealing its functioning mechanism. It aimed to provide a solid theoretical basis for the application of different polymerization degrees of dextran in urea. 【Method】 Four types of modified urea were prepared by incorporating 1% glucose (monosaccharide, GU), maltose (2-poly, MU), oligomeric dextran (≈5-poly, OU), and polydextrose (≈20-poly, PU) into molten urea. Six treatments were designed: no fertilization (CK), conventional urea (U), and four dextran-modified urea treatments. A soil incubation experiment was conducted to evaluate nitrogen transformation, and ¹³C nuclear magnetic resonance (¹³C-NMR) spectroscopy was used to characterize the chemical structures, to uncover the urea conversion mechanism affected by dextran polymerization degree and structural changes. 【Result】 (1) Dextran-modified urea contained a Schiff base structure. (2) Compared with U, dextran-modified urea slowed urea hydrolysis and increased soil amide N content by 15.3%-37.1%, with the highest value in OU. (3) After the application of nitrogen fertilizer, the urease activity of the U treatment peaked at 1 d, whereas the urease activity of the dextran-modified urea treatment peaked at 2 d of incubation. (4) Ammonia volatilization accumulation of dextran-modified urea was reduced by 2.2%-12.9% compared with U. With the increase of the degree of polymerization of dextran, the accumulation of ammonia volatilization showed a gradually increasing trend. (5) At the end of the incubation, NO₃^--N content of dextran-modified urea was increased by 14.1%-30.5%. As the degree of polymerization of dextran increased, the nitrate nitrogen content first increased and then decreased. When the degree of polymerization was 3.35, the nitrate nitrogen content was the highest. 【Conclusion】 Dextran-modified urea effectively delayed urea hydrolysis, reduced ammonia volatilization, and enhanced soil NO₃^--N content. GU had the best impact on reducing ammonia volatilization, while dextran with a medium polymerization degree (3.35) had the best effect on improving the NO₃^--N content in the soil.

Key words: dextran-modified urea, polymerization degree, urea transformation, ammonia volatilization, soil urease activity, fluvo- aquic soil

YAN YanGe, ZHANG ShuiQin, XU Meng, XU JiuKai, LI YanTing, ZHAO BingQiang, YUAN Liang. Transformation Characteristics of Dextran-Modified Urea in Fluvo- Aquic Soil[J].Scientia Agricultura Sinica, 2026, 59(5): 1048-1059.

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处理 Treatment	培养时间Incubation time (d)
处理 Treatment	0.25	0.5	1	2	3	5	7	14	21	28
CK	1.84b	1.71c	1.54d	3.82d	4.71d	3.48c	2.39b	2.56b	2.26a	2.53a
U	39.76a	45.44b	73.92a	141.85a	237.75ab	173.06a	10.56a	2.74ab	2.46a	2.36a
GU	40.05a	47.81a	64.71c	87.10c	244.24a	151.34b	10.59a	2.97ab	2.33a	2.16a
MU	40.00a	48.12a	68.51b	115.27b	226.53c	162.10ab	9.97a	2.71ab	2.23a	2.44a
OU	39.08a	46.61ab	69.82b	139.60a	246.49a	177.57a	13.28a	3.17a	2.14a	2.34a
PU	39.21a	45.79b	63.79d	108.34b	229.67bc	162.01ab	11.00a	2.84ab	2.35a	2.42a

处理 Treatment	培养时间Incubation time (d)
处理 Treatment	0.25	0.5	1	2	3	5	7	14	21	28
CK	8.02b	8.03a	8.06b	8.14a	8.08b	8.05a	8.05a	8.10a	7.97a	8.03a
U	8.13a	8.07a	8.30a	8.14a	8.15b	7.86bc	7.86b	7.89b	7.73b	7.78b
GU	8.02b	8.02a	8.09b	8.12a	8.12b	7.82bc	7.93b	7.89b	7.67b	7.66b
MU	7.97b	8.08a	8.17b	8.04b	8.09b	7.81c	7.85b	7.90b	7.63b	7.78b
OU	8.11a	8.04a	8.10b	7.95c	8.08b	7.82c	7.86b	7.93b	7.66b	7.67b
PU	8.02b	8.02a	8.28a	8.05b	7.95a	7.89b	7.91b	7.86b	7.70b	7.77b

Transformation Characteristics of Dextran-Modified Urea in Fluvo- Aquic Soil

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