Impact of long-term organic fertilizer application on lignin in Mollisol
Fertilization is one of the essential managements to maintain and increase soil organic carbon (SOC) level in agroecosystems.It has been realized that fertilizer applications influenced the turnover of labile and refractory organic carbon pools in arable soil markedly.However,the dynamic of relatively refractory lignin in response to fertilization is still kept unclear.Therefore,the impact of long-term organic fertilization on the content and degradation degree of lignin in Mollisol was investigated.Lignin monomers were released by alkaline CuO oxidation method and quantified by gas chromatography (GC).At the time scale of decades,lignin was clearly accumulated in soil and the relative accumulation of lignin in SOC was evident after long-term organic fertilizer application.Compared with the unfertilized soil,lower acid to aldehyde ratios of vanillyl and syringyl units induced by organic fertilization suggested a lower degradation degree of lignin incorporated into soil to some extent.It could be concluded that long-term organic fertilization was an effective fertilizer practice for lignin accumulation in soil and SOC sequestration in Mollisol in northeast of China.
Soil organic carbon Lignin CuO oxidation Long-term fertilization
Ning Liu Hongbo He Hongtu Xie Zhen Bai Xudong Zhang
Key Laboratory of Terrestrial Ecological Process,Institute of Applied Ecology,Chinese Academy of Sci Key Laboratory of Terrestrial Ecological Process,Institute of Applied Ecology,Chinese Academy of Sci
国际会议
哈尔滨
英文
1332-1335
2010-07-24（万方平台首次上网日期，不代表论文的发表时间）