冻融作用对保护地土壤氮、钾及有机质的影响

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摘要 为了研究冻融作用对保护地土壤化学性质的影响，模拟了土壤冻融现象，并对有机质、氮及钾等进行了测定。结果表明，冻融作用对保护地土壤有机碳（OC）、硝态氮（NO3-）、全氮（AN）和全钾（AK）影响不显著，水溶性有机质和铵态氮含量与初始相比明显增加。随冻融次数的增加，缓效钾呈先减少后增加的趋势。

关键词 冻融作用；有机碳；土壤氮；土壤钾

中图分类号：S153.6 文献标识码：B 文章编号：2095–3305（2022）10–0098–03

Effects of Freezing and Thawing Cycles on Nitrogen， Kalium and Organic Matter of Soil in Protective Farmland

LI Jing et al （College of Geography and Ocean Science， Yanbian University， Yanji， Jilin 133002）

Abstract In order to study the effect of freezing and thawing on the chemical properties of soil in protected areas， the soil freezing and thawing phenomenon was simulated， and the organic matter， nitrogen and potassium were measured. The results showed that freezing and thawing had no significant effect on soil OC， NO3-， AN and AK in the protected area， and the contents of water-soluble organic matter and ammonium nitrogen increased significantly compared with the initial stage. With the increase of freezing and thawing times， the slow-acting potassium showed a trend of first decreasing and then increasing.

Key words Freeze-thaw; Organic matter; Soil nitrogen; Soil potassium

土壤凍融作用是自然界中最常见的过程，它使土壤经历一系列物理和化学变化，导致土壤理化性质发生改变[1]。（剩余3657字）

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