Effect on Soil DOM Content and Structure Characteristics in Different Soil Layers by Long-Term Fertilizations
XIE Jun1, ZHAO Ya-nan1, CHEN Xuan-jing1, WANG Ke1, XU Chun-li1, LI Dan-ping1, ZHANG Yue-qiang1, 2, WANG Ding-yong1, SHI Xiao-jun1, 2*
1. College of Resources and Environment, Southwest University; the Key Laboratory of Arable Land Conservation (Southwest China), Ministry of Agriculture, Chongqing 400716, China
2. National Monitoring Station of Soil Fertility and Fertilizer Efficiency on Purple Soils, Chongqing 400716, China
Abstract：National Monitoring Station of Soil Fertility as a research platform was used combined with UV-Visible absorption spectroscopy to explore how the following fertilizer application: (1) CK (non-fertilization); (2)NPK (applied chemical nitrogen, phosphorus and potassium); (3) NPKS (chemical nitrogen, phosphorus and potassium combined with straw); (4) 1.5NPKS (1.5 times of chemical nitrogen, phosphorus and potassium combined with straw); (5) NPKM (chemical nitrogen, phosphorus and potassium combined with manure) to influence the DOM content and structure in 0~20 and 20~40 and 40~60 cm soil layers. The results showed that long term application chemical fertilizers had less effects on soil DOM content, but chemical fertilizers combined with straw and organic manure significantly increased soil DOM content by 39.1 and 12.1 mg·kg-1 in topsoil. Compared to CK treatment and NPK treatment, chemical fertilizers combined with manure and straw could decrease C/N in 0~20 and 20~40 cm soil layers, and improved the supply of nitrogen in soil, but the DOM and C/N had not significantly difference between different fertilizations in 40~60 cm soil layer. In 0~20 and 20~40 cm soil layers, compared to CK treatment and NPK treatment, the treatments of NPKM，NPKS and 1.5 NPKS increased conjugated structure and humus of soil DOM . In 40~60 cm soil layer, the increased by different fertilizations were not obvious. Chemical fertilizers combined with straw or manure can increase ultraviolet spectrum absorption values of DOM (SUVA254 and SUVA260 and SUVA280) and α (355) in 0~20 cm soil layer, and decrease Ultraviolet spectrum absorption ratios of soil DOM (A250/A365). It showed that the fragrance, hydrophobicity, molecular weight and CDOM increased. Meanwhile, it was not obvious in 20~40 and 40~60 cm soil layers. A300/A400 in different soil layers was greater than 3.5, and it showed this soil was rich in Fulvic Acid. Long term chemical fertilizers combined with manure and straw can increase DOM content in 0~20 and 20~40 cm soil layers, decrease C/N, and increase soil fertility. Meanwhile, it also can increase the conjugated structure, humus, fragrance, hydrophobicity and molecular weight of DOM in 0~20 cm soil layer. Long term fertilization has less effects on soil DOM content and structure in 40~60 cm soil layer.
谢 军，赵亚南，陈轩敬，王 珂，徐春丽，李丹萍，张跃强，王定勇，石孝均. 长期不同施肥对土壤溶解性有机质含量及其结构特征的影响[J]. 光谱学与光谱分析, 2018, 38(07): 2250-2255.
XIE Jun, ZHAO Ya-nan, CHEN Xuan-jing, WANG Ke, XU Chun-li, LI Dan-ping, ZHANG Yue-qiang, WANG Ding-yong, SHI Xiao-jun. Effect on Soil DOM Content and Structure Characteristics in Different Soil Layers by Long-Term Fertilizations. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(07): 2250-2255.
