长尺度气候变化下土壤钾素演变规律的研究——以泾河中游将军村黄土剖面为例

从应用古气候学角度,定量化地分析了近万年以来气候变化与土壤钾素演变规律,研究表明:土壤中速效钾、缓效钾含量与年均降水量或年均气温均服从指数函数模型;而钾素有效性则服从二次函数模型,并且其有效性与古气候变化的对应关系存在临界值,只有当年均气温9.5℃或年均降水量577.3mm时,钾素有效性才随年均降水量或气温的增加呈明显地快速递增;速效钾、缓效钾含量及钾素有效性与古气候条件耦合关系均符合柯布-道格拉斯方程。

Study on the Evolution Law of Potassium with Long Time Scale Climate Change in Jiangjun Loess Section of the Middle Reaches of the Jinghe River

From the perspective of application of paleoclimatology,the evolution law of potassium in soil with long time scale climate change is discussed quantitatively and the main conclusions are as follows.The relationship of the content of available potassium and slowly available potassium and the annual precipitation or the annual temperature obey the exponential function model.The fitting equations of potassium effectiveness and the annual precipitation or the annual temperature accord with the parabolic function model.There is a critical value,only the average temperature(over 9.5°C)or the annual precipitation(over 577.3mm),and its effectiveness presents obviously a progressive increase with the increase of the annual precipitation or the annual temperature.The fitting relationship of the content of available potassium and slowly available potassium,potassium effectiveness and paleoclimatic coupling conditions comply with the Cobd-Douglas equations.