论文部分内容阅读
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.
In order to study the effect of applying S and trace elements (Fe and Zn) on the soil organic carbon (C) holding in grain fields, a 52-day experiment on the decomposition of corn stalk was carried out. The results showed that: The addition of S, Fe and Zn to the solution increased the MBC and soil CO 2 -C mineralization rate. After 52 days of decomposition, the cumulative mineralization of CO 2 -C increased significantly, However, soil organic carbon content did not decrease significantly. Adding three kinds of elements, Fe or Zn increased soil inert carbon pool, inert carbon pool ratio and soil organic carbon apparent balance, which was in favor of soil organic carbon fixation. However, adding S Treatment reduced the ratio of inert organic carbon and the apparent balance of soil organic carbon, which was not conducive to the holding of organic carbon, therefore, adding S, Fe or Zn to straw could increase the contents of soil organic carbon Mineralization process, but adding Fe or Zn can make more organic carbon retained in the soil, adding S is not conducive to the retention of soil organic carbon.