开垦对三江平原别拉洪河流域土壤Fe活性的影响

Effects of Reclamation on Soil Iron Activity in Bielahong River Basin

为探讨农业开垦对土壤Fe活性的影响,采集土样对三江平原别拉洪河流域不同土地利用类型(岸边沼泽、农田附近沼泽、农田)泥炭层、表土层和潜育层中Fe2+、络合Fe及土壤相关理化指标进行分析。结果表明,土壤开垦后,与岸边天然沼泽相比,农田附近沼泽及农田土壤Fe2+、络合Fe含量整体上呈降低趋势,显示开垦促进了土壤有机碳损失,降低了土壤Fe活性。不同土地利用类型土壤各层中络合Fe与土壤TOC相关性显著,表明TOC是影响土壤Fe活化的重要因子。研究结果有助于深入了解土地利用状况变化对土壤Fe活性的影响,进而为耕地的合理开垦提供一定的理论依据。

Research has been conducted to explore Fe^2＋ content,complex Fe in peat layer, surface soil layer and gley horizon of different land use types（ marsh near the river shore, swamp near the farmland and farmland） and related physical and chemical properties of soil. Compared to the marsh near the river shore, the content of Fe^2＋ , and complex Fe decreased in the soil of swamp near the farmland and farmland. Those results indicated that reclamation accelerated the loss of soil organic carbon, and reduced the activation of soil Fe. The content of TOC was significant correlation with complex Fe in different soil layers of different land use types. It showed that TOC is one of important factors which effect the activation of soil Fe. The results indica- ted that the results contribute to a deeper understanding on the effects of land use change on soil Fe activity, and provide some rational theoretical basis for the reclamation of arable lands.