不同施肥制度下中国东部典型土壤易分解与耐分解氮的组分特征

doi:10.3864/j.issn.0578-1752.2015.15.010

Abstract

Abstract: 【Objective】Labile nitrogen (Lab-N) and recalcitrant nitrogen (Rec-N) are two important components of soil nitrogen, and their ratio has an effect on nitrogen turnover and sequestration properties. Therefore, it is important to study the characteristics of Lab-N and Rec-N under different long-term fertilization systems for better nitrogen management and soil fertility improvement. 【Method】Lab-N, Rec-N and their ratio were studied by particle size-density separation method under four long-term fertilizer treatments, namely no fertilizer (CK), chemical fertilizer (NPK), chemical fertilizer combined with straw (NPKS), and chemical fertilizer combined with manure (NPKM), of three upland soils (Gongzhuling black soil, Zhengzhou fluvo-aquic soil and Qiyang red soil) and Wangcheng paddy soil that collected from east China. 【Result】 The average Lab-N in upland soils was 0.15 g·kg^-1, much lower than that of paddy soil (0.22 g·kg^-1). While Lab-N/TN in upland soils was much higher than that in paddy soil. After 23 years, the Total N (TN) of the upland soils under CK treatment decreased significantly (7.5%-9.7%) compared with the start of the experiment, while in the paddy soil the TN increased by 11.5%. The TN contents in all soils under NPK treatment were significantly higher than that of CK treatment. The Lab-N of red soil under NPK treatment was significantly lower than that of CK treatment, while for other soils there were no significant differences under two treatments. The TN contents of all soils under NPKS treatment increased significantly compared with CK treatment, while there was no significant difference in the Lab-N and Lab-N/TN between black soil and paddy soil. The Lab-N of red soil under NPKS treatment decreased significantly compared with CK treatment, while the Lab-N of fluvo-aquic soil increased significantly. The TN, Lab-N and the Lab-N/TN in the upland soils under NPKM treatment increased significantly. And the black soil increased the most by 85.0%, 106.0% and 4.2%; there was no significant difference in the Lab-N and Lab-N/TN in the paddy soil between NPKM and CK treatments. Both the Rec-N and the TN in four soils under four different treatments were in the order of NPKM＞NPKS＞NPK＞CK. The Rce-N/TN under NPKM decreased significantly compared with CK treatment. 【Conclusion】 Both the Lab-N and the Lab-N/TN in upland soils were more susceptible to fertilizer application compared with paddy soil. The TN, Lab-N and Lab-N/TN all increased significantly under NPKM treatment, and the improvement effect was in the order of NPKM＞NPKS＞NPK.

Key words: labile nitrogen, recalcitrant nitrogen, upland soil, paddy soil, long-term fertilization

YU Wei-shui, LU Chang-ai, LI Gui-hua, WU Hong-liang, ZHAO Ya-wen, WANG Bi-sheng, MENG Fan-hua. Component Characteristics of Soil Labile and Recalcitrant Nitrogen Under Different Long-Term Fertilization Systems in East China[J].Scientia Agricultura Sinica, 2015, 48(15): 3005-3014.

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