不同配比氮素形态对添加玉米秸秆白浆土有机碳官能团的影响  

Effects of Nitrogen Form Ratios on Organic Carbon Functional Groups of Albic Soil with Corn Straw

作　　者：王帅[1,2] 王楠[1] 徐俊平[1] 包岩[1] 李玉玺[1] 姚凯[1] 迟秀宇 沈标[2] 张晋京[3] 

机构地区：[1]吉林农业科技学院植物科学学院,吉林吉林132101 [2]南京农业大学资源与环境科学学院,南京210095 [3]吉林农业大学资源与环境学院,长春130118

出　　处：《吉林大学学报（理学版）》2017年第3期725-732,共8页Journal of Jilin University:Science Edition

基　　金：吉林省教育厅"十二五"科学技术研究项目(批准号:吉教科合字[2015]第375号);国家自然科学基金(批准号:41401251);吉林农业科技学院重点学科培育项目(批准号:吉农院合字[2015]第X004号)

摘　　要：采用近边X射线吸收精细结构光谱及定量分析方法,对施入同等氮素用量、不同氮素形态组合n(NH+4)∶n(NO-3)=4,1,1∶4条件下添加玉米秸秆白浆土的有机碳(SOC)官能团进行系统分析.结果表明:添加任何形态的氮素均有助于微生物对混以秸秆白浆土SOC的矿化;氮素以铵硝等比例添加在促进SOC矿化分解方面更具优势,有利于白浆土富里酸组分的形成和积累,使其腐殖酸活性提升较大;硝态氮占优的氮素形态配比更有益于微生物在短期内对SOC的分解转化,微生物多以消耗C—OH获取能量,对于芳香碳也有一定累积作用,提高了SOC分子的整体复杂程度;铵态氮占优的氮素使微生物更易消耗SOC官能团中的羧基,促使其降解形成更多的醇羟基C—OH;混以玉米秸秆白浆土SOC官能团的主要类型有芳香烃C■C和C—H、脂肪烃、羧基C■O、醇羟基C—OH及石墨型C■C.Using near-edge X-ray absorption fine structure （NEXAFS） spectrum combined with the quantitative analysis method, we carried on the system analysis to the organic carbon functional groups of albic soil with corn straw based on the application of equal nitrogen amount and different nitrogen forms of n（NH＋） ： n（NO3^-）=4,1,1 = 4. The results show that the addition of nitrogen in any form is helpful to the microbial mineralization of soil organic carbon （SOC） of albic soil with corn straw. The n （NH＋） ： n （NO3-）= 1 is more advantageous in promoting the mineralization and decomposition of SOC, which is beneficial to the formation and accumulation of fulvic acid extracted from the albic soil, and to enhance its physiological activity of humic acid to a larger degree; the N supply mainly dominated by NO3-N is more beneficial to the microbial decomposition and transformation of SOC in a short period of time, and most of the microorganisms can obtain energy from consuming the C-OH groups, which also has a cumulative effect on aromatic carbon, and increasing the complexity degree of SOC molecules. Influenced by the NH4＋-N that served as the main N form, the microorganisms are more inclined to consume much more carboxyl functional groups of SOC and make them decomposed and transformed into much more alcoholic hydroxyl groups （C-OH）. There are some main types of SOC functional groups existing in the albic soil with corn straw, such as aromatic hydrocarbon C = C and C-H, aliphatic hydrocarbon, carboxyl group C = O, alcoholic hydroxyl group C--OH and graphite type C= C.

关 键 词：氮素形态 白浆土 玉米秸秆 近边X射线吸收精细结构光谱 定量分析 有机碳官能团 

分 类 号：X142[环境科学与工程—环境科学] S158.5[农业科学—土壤学]