农业环境科学学报2011，Vol.30Issue(12)：2518-2525,8.
秸秆还田对宁南旱区土壤有机碳含量及土壤碳矿化的影响
Effects of Straw Returning on Soil Organic Carbon and Carbon Mineralization in Semi-arid Areas of Southern Ningxia, China
摘要
Abstract
A field experiment was conducted to determine the effects of straw returning systems on soil organic carbon and carbon mineralization of millet or com under different straw returning supplies. In order to provide a basic theoretical to establish the fertilization system and crop management for semi-arid areas of southern Ningxia, we studied the effects of straw returning , taking no straw returning as the control, on soil organic carbon, mineralization rate, mineralization amount and the correlation with different kinds of soil carbon under different straw returning treatments [3 000 kg·hm-2(L), 6 000 kg·hm-2(M) and 9 000 kg·hm-2(H) of millet straw and 4 500 kg·hm-2(L), 9 000 kg·hm-2 (M) and 13 500 kg·hm-2(H) of corn straw] for four years(2007-2010). After the millet harvest(2010), the results of four years field experiment showed that soil total organic carbon and labile organic carbon decreased with deeper layer; compared with CK, with the reduction of straw returning in 0-60 cm soil layer, the soil organic carbon increased 24.2%, 20.8%, 9.5%(P<0.05), and soil labile organic carbon increased 50.3%,46.6%, 34.8%(P<0.05); straw returning treatment improved the proportion of the labile organic carbon , which accounts for 21.1%~23.1%(P<0.05) of the total organic carbon content in 0~20 cm soil layer. Different straw returning treatments had different effects on the contents of soil carbon mineralization rate and mineralization amount of 0~60 cm soil layer, follow the order from high to low H>M>L>CK; the straw returning had significant difference with CK. The soil carbon mineralization amount had extremely significant correlation with other kinds of soil carbon. The content of soil organic carbon and carbon mineralization could be improved efficienT1y by using of straw returning technology in semi-arid areas of Southern Ningxia.关键词
秸秆还田/宁南旱区/土壤有机碳/土壤碳矿化Key words
straw returning/ semi-arid areas of southern Ningxia/ soil organic carbon/ carbon mineralization分类
农业科技引用本文复制引用
张鹏,李涵,贾志宽,王维,路文涛,张惠,杨宝平..秸秆还田对宁南旱区土壤有机碳含量及土壤碳矿化的影响[J].农业环境科学学报,2011,30(12):2518-2525,8.基金项目
"十一五"国家科技支撑课题"农田集雨保水关键技术研究"(2006BAD29B03) （2006BAD29B03）
"节水共性技术研究"(2007BAD88B10) （2007BAD88B10）
