草业学报Issue(2)：58-67,10.DOI:10.11686/cyxb2015292
陇中黄土高原不同草田轮作模式土壤碳组分的差异研究
Soil carbon fraction differences under different grass-crop rotations on the Loess Plateau,Central Gansu
摘要
Abstract
Field experiments investigating the effect of continuous lucerne (Medicago sativa )(L-L)and five ro-tation systems [lucerne-fallow (L-F),lucerne-wheat (L-W),lucerne-corn (L-C),lucerne-potato (L-P),lu-cerne-millet (L-M)]on total organic carbon (TOC),readily oxidation organic carbon (ROC),light fraction or-ganic carbon (LFOC)and heavy fraction organic carbon (HFOC)in a typical arid area of the Western Loess Plateau.The results showed that under different rotation systems TOC and soil organic carbon fractions de-creased with increasing soil depth (0 -200 cm soil depth).The highest TOC,ROC and HFOC values were found in the surface soil layer (0-5 cm)under the L-L rotation system,and the lowest values at mid depths(30-50 cm)under the L-W rotation system.The highest and lowest values for LFOC were found in the sur-face soil layer (0-5 cm)under the L-P rotation and the bottom soil layer (170-200 cm)under the L-C rota-tion,respectively.Compared with L-L rotation,the L-W,L-C,L-P and L-M rotations reduced TOC by 17.4%,9.3%,18.4% and 9.3%,respectively.Similarly,ROC was reduced by 28.1%,8.5%,28.1% and 23.2% and HFOC by 18.8%,10.1%,20.5% and 12.5% respectively.However,LFOC increased by 7.4%, 5.3%,22.2% and 57.4% under L-W,L-C,L-P and L-M rotations,respectively.It was concluded that lu-cerne-grain rotation systems reduce TOC.关键词
黄土高原/苜蓿/轮作/土壤有机碳组分Key words
Loess Plateau/lucerne/rotation/soil organic carbon fractions引用本文复制引用
赵靖静,罗珠珠,张仁陟,蔡立群,李玲玲,牛伊宁..陇中黄土高原不同草田轮作模式土壤碳组分的差异研究[J].草业学报,2016,(2):58-67,10.基金项目
国家科技支撑计划（2012BAD14B03），国家自然科学基金（31171513，41461067），甘肃省干旱生境作物学重点实验室－省部共建国家重点实验室培育基地基金（GSCS-2012-08），甘肃省科技计划（145RJZA208），甘肃省财政厅高校基本科研业务费项目（037-041014）和甘肃农业大学青年导师基金项目（gau-qnds-201402）资助。 （）
