升金湖沿湖不同土地利用方式下土壤有机质和养分变化特征

为探讨升金湖沿湖不同土地利用方式土壤养分含量特征，以林地、农田、菜地和草地为研究对象，测定土壤有机质、pH值、C/N值以及氮磷钾等元素的含量。结果表明：（1）四种土地利用方式下，土壤 pH 值大小顺序为：农田>草地>林地>菜地，菜地和林地pH 值均为弱酸性；（2）土壤有机质含量顺序为：菜地>林地>农田>草地，菜地和林地有机质含量丰富，农田和草地稍欠缺。菜地C/N最高，农田C/N最低。（3）土壤全氮含量顺序为：菜地>林地>农田>草地。全磷、全钾含量没有明显差异，土地利用方式对二者影响不大。菜地中碱解氮和速效钾含量最高，农田中有效磷含量最高。本研究结果可为升金湖湖区土地资源的合理利用、保持和提高土壤肥力以及区域生态协调提供科学参考。

Characteristics of Soil Organic Matter and Nutrient Contents Under Different Land Use Types Along Shengjin Lake

To explore the characteristics of soil organic matter and nutrient contents under different land use types along the Shengjin Lake, the content of soil organic matter, soil pH, C/N and the contents of nitrogen, phosphorus and potassium under farmland, grassland, forest land and vegetable land were surveyed and determined. The results show that: 1) The order of soil pH value is as follows: farmland>grassland>forest land>vegetable land, and the soils of vegetable land and forest land are weakly acidic. 2) The order of soil organic matter content is as follows: vegetable land>forest land>farmland>grassland. Soil organic matter is rich in vegetable land and forest land while slightly insufficient in farmland and grassland. C/N is the highest in vegetable land while the lowest in farmland. 3) The order of soil total nitrogen content is as follows: vegetable land>forest land>farmland>grassland. There is no significant difference in total phosphorus and total potassium contents among different land use types, indicating land use type has little impact on them. The contents of soil available nitrogen and potassium are the highest in vegetable land, while the content of soil available phosphorus is the highest in farmland. The results of the study can provide scientific references for the rational utilization of soil resources, the maintenance and improvement of soil fertility, and the coordination of ecology in the Shengjin Lake District.