中国生态农业学报Issue(1)：27-35,9.DOI:10.13930/j.cnki.cjea.150707
苜蓿作物轮作模式对土壤团聚体稳定性及有机碳的影响
Effects of lucerne-crop rotation patterns on soil aggregate stability and soil organic carbon
摘要
Abstract
A local experiment of lucerne-crop rotation system was conducted on dry farmlands of the Loess Plateau in Central Gansu Province to determine the distribution characteristics of soil aggregate stability and soil organic carbon. The experiment included six rotation patterns — lucerne-lucerne (LL), lucerne-fallow (LF), lucerne-wheat (LW), lucerne-corn (LC), lucerne-potato (LP) and lucerne-millet (LM). Soil aggregate characteristics and organic carbon content were investigated after crop harvest. The results showed that ≥0.25 mm aggregate was the dominant component of the mechanically stable aggregates of soil, which accounted for >72.17% of the mechanically stable aggregates. However, the <0.25 mm aggregates was the dominant component of the water stable aggregates, which exceeding 95.18% of the water stable aggregates. The content of the≥0.25 mm aggregates of soil and its mean weight diameter (MWD) increased with increasing soil depth, while larger water stable aggregates content and MWD were irregularly changed. Compared with LL treatment, the ≥0.25 mm aggregates contents of LC and LP treatments increased by 5.94% and 1.12%, respectively, at soil depth of 0-30 cm. The MWD in LC treatment was the highest among all treatments. Soil organic carbon (SOC) content decreased with increasing soil depth in all rotation patterns. Compared with LL rotation pattern, SOC contents in LF, LC, LP and LM treatments all declined to different extents at 0-30 cm soil depth, especially, it significantly decreased by 18.68% in LP treatment. The correlation analysis indicated that SOC content had significantly positive relation with water stable soil aggregates of 2-5 mm, 1-2 mm, 0.5-1 mm, 0.25-0.5 mm and MWD, while it had significantly negative relation with<0.25 mm soil aggregate content. In conclusion, LC rotation pattern significantly increased the mechanical stability of soil aggregates. However, the effect of different rotation patterns on water stable soil aggregates was negligible. Furthermore, SOC content significantly influenced the formation and stability of water stable aggregate.关键词
苜蓿作物轮作/轮作模式/土壤团聚体/机械稳定性/水稳性/土壤有机碳Key words
Lucerne-crop rotation/Rotation pattern/Soil aggregate/Mechanical stability/Water stability/Soil organic carbon分类
农业科学引用本文复制引用
宋丽萍,罗珠珠,李玲玲,蔡立群,张仁陟,牛伊宁..苜蓿作物轮作模式对土壤团聚体稳定性及有机碳的影响[J].中国生态农业学报,2016,(1):27-35,9.基金项目
国家科技支撑计划项目(2012BAD14B03)、国家自然科学基金项目(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项目(GSCS-2012-08)、甘肃省科技计划项目(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* This study was supported by the National Key Technologies R & D Program of China (No.2012BAD14B03), the National Natural Science Foundation of China (No.31171513,41461067), the Open Funds of Gansu Provincial Key Laboratory of Arid Land Crop Science (No. GSCS-2012-08), the Natural Science Foundation of Gansu Province (No.145RJZA208), the Fundamental Research Funds of the Finance Department of Gansu Province (No.037-041014) and the Research Funds for Young Scholar of Gansu Agricultural University (No. gau-qnds-201402) （2012BAD14B03）
