文献类型： 外文期刊

作者： Wu, TY ¹ ; Schoenau, JJ ² ; Li, FM ² ; Qian, PY ² ; Malhi, SS ² ; Shi, YC ² ;

作者机构： 1.Lanzhou Univ, State Key Lab Arid Agroecol, Lanzhou 730000, Peoples R China

2.Lanzhou Univ, State Key Lab Arid Agroecol, Lanzhou 730000, Peoples R China; Univ Saskatchewan, Dept Soil Sci, Saskatoon, SK S7N 5A8, Canada; Agr & Agri Food Canada, Res Stn, Melfort, SK S0E 1A0, Canada; Gansu Agr Acad, Soil Sci & Fertilizer Inst, Lanzhou 730070, Peoples R China

关键词： Tillage;No-tillage;Rotation system;Seeded grass;Soil organic;Southwestern saskatchewan;Crop rotations;Light-fraction;Microbial;biomass;Matter quality

期刊名称：JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE-ZEITSCHRIFT FUR PFLANZENERNAHRUNG UND BODENKUNDE （ 影响因子：1.595； 五年影响因子：1.766 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： The effects of selected tillage and rotation systems on soil organic carbon and its fractions were studied on Chemozemic soils in south-western and east-central Saskatchewan. After practicing a no-till fallow unfertilized-wheat rotation for 7 years on an Orthic Brown Chemozem in southwestern Saskatchewan, total soil organic carbon (TOC) in the 0 - 5 cm and 5 - 10cm layers was slightly lower than the tillage fallow-unfertilized wheat comparable treatment. However, light fraction of organic carbon (LFOC) was similar in the two treatments. Comparison of the tillage fallow-unfertilized wheat to a treatment involving conversion to a fertilized continuous cropping system for 10 years showed TOC increased slightly in the two depths and LFOC increased by 24% and 29% in the 0 - 5 cm and 5 - 10 cm layer, respectively, of the continuous cropping treatment. Microbial biomass carbon (MB-C) was increased significantly at the 5 - 10cm depth. After conversion of fallow-wheat to alfalfa as perennial forage for 10 years, TOC increased by 80% and 27%, LFOC by 245% and 286%, and HFOC by 63% and 20% at 0 - 5 cm and 5 - 10 cm depths, respectively, compared to the tilled cereal-fallow system. Meanwhile, water soluble organic carbon (WSOC) was not affected but MB-C increased significantly.