凍融作用對(duì)保護(hù)地土壤氮、鉀及有機(jī)質(zhì)的影響

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摘要 為了研究?jī)鋈谧饔脤?duì)保護(hù)地土壤化學(xué)性質(zhì)的影響，模擬了土壤凍融現(xiàn)象，并對(duì)有機(jī)質(zhì)、氮及鉀等進(jìn)行了測(cè)定。結(jié)果表明，凍融作用對(duì)保護(hù)地土壤有機(jī)碳（OC）、硝態(tài)氮（NO3-）、全氮（AN）和全鉀（AK）影響不顯著，水溶性有機(jī)質(zhì)和銨態(tài)氮含量與初始相比明顯增加。隨凍融次數(shù)的增加，緩效鉀呈先減少后增加的趨勢(shì)。

關(guān)鍵詞 凍融作用；有機(jī)碳；土壤氮；土壤鉀

中圖分類(lèi)號(hào)：S153.6 文獻(xiàn)標(biāo)識(shí)碼：B 文章編號(hào)：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見(jiàn)的過(guò)程，它使土壤經(jīng)歷一系列物理和化學(xué)變化，導(dǎo)致土壤理化性質(zhì)發(fā)生改變[1]。（剩余3657字）