中文摘要：

为研究秸秆还田配施中量元素（S）和微量元素（Fe和Zn）对粮田土壤有机碳固持的影响,进行了为期52 d的室内玉米秸秆腐解培养试验.结果表明：秸秆腐解过程中分别添加S、Fe和Zn元素,均提高了微生物生物量碳（MBC）及土壤CO_2-C矿化速率,52 d腐解培养结束后,CO_2-C的累积矿化量显著提高,但土壤有机碳含量并未显著降低;3种元素中,添加Fe或Zn的处理提高了土壤惰性碳库、惰性碳库比例及土壤有机碳表观平衡,有利于土壤有机碳固持,而添加S的处理却降低了惰性有机碳比例及土壤有机碳表观平衡,不利于有机碳固持.因此,在施N、P肥基础上,秸秆还田添加S、Fe或Zn均能促进土壤有机碳的矿化进程,但添加Fe或Zn可使更多有机碳固持于土壤中,添加S不利于土壤有机碳的固持.

英文摘要：

A 52-day incubation experiment was conducted to investigate the effects of maize straw decomposition with combined medium element（ S） and microelements（ Fe and Zn） application on arable soil organic carbon sequestration.During the straw decomposition,the soil microbial biomass carbon（ MBC） content and CO_2-C mineralization rate increased with the addition of S,Fe and Zn,respectively.Also,the cumulative CO_2-C efflux after 52-day laboratory incubation significantly increased in the treatments with S,or Fe,or Zn addition,while there was no significant reduction of soil organic carbon content in the treatments.In addition,Fe or Zn application increased the inert C pools and their proportion,and apparent balance of soil organic carbon,indicating a promoting effect of Fe or Zn addition on soil organic carbon sequestration.In contrast,S addition decreased the proportion of inert C pools and apparent balance of soil organic carbon,indicating an adverse effect of S addition on soil organic carbon sequestration.The results suggested that when nitrogen and phosphorus fertilizers were applied,inclusion of S,or Fe,or Zn in straw incorporation could promote soil organic carbon mineralization process,while organic carbon sequestration was favored by Fe or Zn addition,but not by S addition.