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天津市水土环境地球化学调查发现了大面积的富钾土地资源,该文利用调查数据圈定富钾土地资源区,并对其储量进行估算,目的是为保护和合理利用富钾土地资源提供科学依据。依据土壤全钾含量大于2.5%圈定了8个富钾土地资源区,主要分布在宁河-汉沽地区,其次分布在蓟县山区。蓟县富钾土地由富钾岩石风化形成,宁河-汉沽富钾土地形成与退海古泻湖有关。富钾土地资源区总面积约1303.17km2,耕植层(0～20cm)和0～100cm土体中估算全钾总储量分别为8 638.36t和47 327.65t。
A large area of potassium-rich land resources has been found in the survey of soil and water environment in Tianjin. This paper delineates the area of potassium-rich land resources using survey data and estimates their reserves in order to provide a scientific basis for the protection and rational utilization of potassium-rich land resources . According to the total potassium content of soil is more than 2.5%, eight potassium-rich land resource areas are delineated, mainly distributed in Ninghe-Hangu area and secondly in Jixian mountainous area. The potassium-rich land in Jixian County is formed by the weathering of potassium-rich rocks, and the formation of rich Ningxia-Hangu potassium land is related to the return of the ancient lagoon. The total area of potassium-rich land resource area is about 1303.17km2. Total potassium reserves in cultivated layer (0 ~ 20cm) and 0 ~ 100cm soil are estimated to be 8 638.36t and 47 327.65t, respectively.