中国生态农业学报Issue(8)：973-978,6.DOI:10.13930/j.cnki.cjea.150220
小麦-玉米秸秆连续还田对土壤有机质红外光谱特征及氮素形态的影响
Effect of continuous wheat and maize straw incorporation on soil nitrogen and Fourier transform infrared spectroscopic (FTIR) characterization of soil organic matter
摘要
Abstract
A 6-year field experiment was conducted to study the changes in the forms of soil nitrogen under the treatments of SF (chemical fertilizer application without straw incorporation), T1 (chemical fertilizer application with smashed maize straw incorporation), T2 (chemical fertilizer application with smashed wheat straw incorporation), T3 (chemical fertilizer application with smashed maize and wheat straws incorporation), with no fertilization and no straw incorporation (CK) as the control. Change in FTIR (Fourier transform infrared spectroscopic) characteristics of soil organic matter was also analyzed. The results showed that compared with SF, soil organic nitrogen under T1, T2 and T3 treatments increased respectively by 3.7%, 15.9% and 18.5% and soil inorganic nitrogen decreased by 15.5%, 15.9% and 24.0%. And the ammonium nitrogen content in the treatment of T1, T2, T3 decreased respectively by 11.3%, 6.0% and 12.0% and nitrate nitrogen decreased by 19.3%, 22.9% and 32.1%. The C/N ratio in SOM under T1 and T3 treatments decreased respectively by 2.8% and 1.4%, but the C/N ratio in T2 treatment increased by 1.4%, compared with those under SF treatment. And the ratio of C/O in SOM increased respectively by 9.2%, 12.8% and 12.1% and H/C ratio decreased by 4.6%, 5.5% and 4.6% under T1, T2 and T3 treatments compared with under SF. FTIR spectrum analysis showed that SOM absorption intensity in the 3 500-3 200 cm-1 band increased under T1, T2 and T3 treatments, with a new band at the 2 924 cm-1 band. This suggested an increase in aliphatic compounds of SOM. The absorption intensity at the 1 630 cm-1 band strengthened, suggesting increase in aromatic compounds content. The results verified that fertilization significantly increased the soil contents of organic and inorganic nitrogen as well as the ratios of C/N and C/O in SOM. The incorporation of crop straw residue decreased inorganic nitrogen as well as the ratios of C/N, H/C in SOM. It also increased the content of organic nitrogen and the ratio of C/O in SOM. Meanwhile, the incorporation of straw residue (under T1, T2 and T3 treatments) increased the contents of alcohols, phenols and carboxylic acids, aromatic carbon and amide groups of SOM. The incorporation of both wheat and maize straw residues had more obvious effect.关键词
施肥/秸秆连续还田/土壤有机质/氮素形态/元素组成/红外光谱分析Key words
Fertilizer application/Continuous straw incorporation/Soil organic matter/Nitrogen form/Element component/FTIR spectra analysis分类
农业科技引用本文复制引用
陈曦,张敬智,张雅洁,常江,章力干,郜红建..小麦-玉米秸秆连续还田对土壤有机质红外光谱特征及氮素形态的影响[J].中国生态农业学报,2015,(8):973-978,6.基金项目
国家自然科学基金项目(31328020)和国家科技支撑计划项目(2013BAD07B08,2012BAD04B09)资助 （31328020）
