title: [Effects of different tillage methods and straw-returning on soil organic carbon content in a winter wheat field].
abstract: A two growth seasons experiment was conducted to study the effects of different tillage methods, straw-returning, and their interaction on the dynamic change of organic carbon content in 0-20 cm soil layer during the whole growth period of winter wheat. An obvious change was observed in the soil organic carbon content. Treatments with straw-returning had higher soil organic carbon content than treatments with no straw-returning, and conservation tillage induced higher soil organic carbon content than conventional tillage. In all treatments except conventional tillage, the organic carbon content in 0-10 cm soil layer was higher than that in 10-20 cm soil layer. In treatments with straw-returning, the organic carbon content in 0-10 cm soil layer decreased in order of deep soiling (PS) > rotary tillage (PR) > no tillage (PZ) > normal ploughing (PH) > conventional tillage (PC), while that in 10-20 cm soil layer was PC > PS > PR > PH > PZ, suggesting that conservation tillage could improve the organic carbon content in 0-10 cm soil layer. Multi factor variance analysis showed that tillage method, straw-returning, and their interaction had significant effects on the organic carbon content in 0-20 cm soil layer at various growth stages of winter wheat.
authors.affiliation: State Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, Tai' an 271018, Shandong, China. tiansz1616@163.com
authors.forename: Shen-Zhong
authors.initials: SZ
authors.lastname: Tian
authors.forename: Tang-Yuan
authors.initials: TY
authors.lastname: Ning
authors.forename: Yu
authors.initials: Y
authors.lastname: Wang
authors.forename: Hong-Jie
authors.initials: HJ
authors.lastname: Li
authors.forename: Wei-Lei
authors.initials: WL
authors.lastname: Zhong
authors.forename: Zeng-Jia
authors.initials: ZJ
authors.lastname: Li
mesh_terms: D000383:Agriculture / Q000379:methods*; D000704:Analysis of Variance; D002244:Carbon / Q000032:analysis*; D009930:Organic Chemicals / Q000032:analysis; D018547:Plant Stems / Q000737:chemistry*; D012987:Soil / Q000032:analysis*; D014908:Triticum / Q000254:growth & development*
chemical_list: D009930:Organic Chemicals; D012987:Soil; D002244:Carbon