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选取位于吉林省西部的通榆县作为研究区,利用全国第二次土壤普查数据和2006年土壤采样分析数据,结合土地利用数据,研究土地利用方式及其动态变化对县域尺度表层(0~20 cm)土壤养分的影响。结果表明:近20年来通榆县土地利用格局变化显著,表层土壤全量养分显著降低,土壤有机质和速效养分则无显著变化。2006年耕地、林地和草地的土壤有机质、全氮、全钾、速效氮、速效磷含量无显著差异,全磷和速效钾含量差异性显著;除全磷、全钾和速效钾外,盐碱地土壤养分含量均显著低于耕地、林地和草地。除荒地开垦后土壤有机质含量增加,毁草、毁湿开荒以及多年放牧和耕作均造成土壤有机质含量降低;不同土地利用变化过程对土壤全量养分的影响以降低含量为主,而速效养分则以增加含量为主。
Tongyu County, located in the west of Jilin Province, was selected as the study area. Based on the data of the second national soil survey and the data of soil sampling in 2006 and the land use data, the effects of land use patterns and their dynamic changes on the scale of the county scale (0-20 cm) soil nutrients. The results showed that the land use pattern of Tongyu County changed significantly in the past 20 years, the total amount of nutrients in surface soil decreased significantly, while the soil organic matter and available nutrients did not change significantly. There was no significant difference in soil organic matter, total nitrogen, total potassium, available nitrogen and available phosphorus in cultivated land, forestland and grassland in 2006, and the content of total phosphorus and available potassium was significantly different. In addition to total phosphorus, total potassium and available potassium, Nutrient content was significantly lower than the cultivated land, woodland and grassland. After reclamation, the content of organic matter in the soil increased, the content of soil organic matter decreased due to the destruction of grassland, desiccation and wasteland, as well as grazing and tillage for many years. The effect of different land use changes on soil total nutrients decreased mainly, but the available nutrients increased Content-based.