应用生态学报2015，Vol.26Issue(1)：93-100,8.
长期施肥下亚热带典型农田(旱地)土壤木质素的积累特性
Effect of long-term fertilization on lignin accumulation in typical subtropical upland soil
摘要
Abstract
To investigate the effect of long-term fertilization on lignin accumulation and clarify its influencing factors in subtropical agricultural upland soils,alkaline CuO oxidation and gas chromatography was performed to quantify the amount of lignin and its monomers components (V,S and C).The soil samples were collected from the fertilization treatments of NPK and NPKS (NPK combined with straw) in Huanjiang County,Guangxi Province (limestone soil) and Taoyuan County,Hunan Province (red soil).The results showed that NPK had no significant effect on the lignin content (Sumvsc) of limestone soil,whereas the content in red soil significantly increased by (55± 1)％.For the NPKS treatment,the lignin content in limestone and red soil increased by (328 ± 4) ％ and (456 ±9)％,respectively.After the same fertilization treatment,the proportion of cinnamyl (C)-type significantly increased in red soil,while a significant increase of vanillyl (Ⅴ)-type monomers occurred in limestone soil,indicating that lignin degradation in agricultural soils was monomer specific.Furthermore,the acid-to-aldehyde ratios of syringyl-type [(Ac/Al) s] or vanillyl-type [(Ac/Al)v] monomers tended to decrease after long-term fertilization with the higher value for limestone soil,suggesting the degree of lignin degradation in limestone was higher than that in red soil.Soil organic matter and total nitrogen were not correlated with lignin content,but were significantly correlated with the composition of VSC monomers.Meanwhile,the available nutrient content in the soil (available nitrogen,phosphorus,and potassium) was closely related to the contents and components of V,S,and C-type monomers (P＜0.05).It indicated that the availability of soil nutrition should be considered as a key factor for the accumulation of lignin.关键词
长期施肥/秸秆还田/木质素/积累特性/土壤酶活性Key words
long-term fertilization / returning straw to field / lignin/ accumulation characteristics /soil enzyme activity分类
农业科技引用本文复制引用
冯书珍,陈香碧,何寻阳,董明哲,邱虎森,苏以荣..长期施肥下亚热带典型农田(旱地)土壤木质素的积累特性[J].应用生态学报,2015,26(1):93-100,8.基金项目
国家自然科学基金青年科学基金项目(41301273)、国家自然科学基金重点项目(41430860)、国家科技支撑计划项目(2012BAD05B03-6)和中国科学院“西部之光”人才培养计划“西部博士项目”资助. （41301273）
