土壤2018，Vol.50Issue(1)：115-121,7.DOI:10.13758/j.cnki.tr.2018.01.016
长期施肥对水稻根系有机酸分泌和土壤有机碳组分的影响
Effects of Long-term Fertilization on Organic Acids in Root Exudates and SOC Components of Red Paddy Soils
摘要
Abstract
Based on the long-term fertilization experiment conducted since 1981 in red paddy soil in the Red Soil Institute of Jiangxi Province, China, the effects of different fertilization treatments, including no fertilizer (CK), chemical fertilizer only (NPK), chemical fertilizer plus organic manures (NPKM) were studied on the secreting rates of organic acids in rice root exudates and on SOC components. Results showed that NPK and NPKM treatments increased total organic acid contents in the root exudates compared with CK treatment (P<0.05, the below is same). Compared with treatment of CK, NPK treatment significantly increased the secreting rate of tartaric acid by 82.63%, NPKM treatment significantly increased oxalic acid and malic acid by 69.93% and 110.98%, respectively; however, NPK and NPKM treatments significantly decreased citric acid secreting rates by 36.57% and 40.57%, respectively. Compared with CK, NPKM treatment significantly increased the contents of soil organic carbon (SOC), particulate organic carbon (POC), microbial biomass organic carbon (MBC) and dissolved organic carbon (DOC), while NPK treatments influenced these components insignificantly. NPKM treatment also promoted the accumulation of humic acid-like and fulvic acid-like materials, which constituted 31% and 44% of DOC, respectively; whereas NPK treatment changed DOC components little. The organic matters of DOC were botanically and microbially derived in CK and NPK treatments, while they were resulted from the processes such as extracellular release and microorganism excretion in NPKM treatment.关键词
长期施肥/红壤性水稻土/有机酸/有机碳组分/可溶性有机碳Key words
Long-term fertilization/Red paddy soil/Organic acid/Organic carbon fractions/Dissolved organic carbon分类
农业科技引用本文复制引用
关强,蒲瑶瑶,张欣,王媛媛,李大明,李辉信,胡锋,焦加国,管晓进..长期施肥对水稻根系有机酸分泌和土壤有机碳组分的影响[J].土壤,2018,50(1):115-121,7.基金项目
国家自然科学基金项目(41201252)和国家重点研发计划课题(2016YFD0200106,2016YFD0300908)资助. （41201252）
