冻融作用对土壤氮转化影响的研究进展

氮素是限制植物生长的重要营养元素之一,其在土壤中转化程度受多种因素影响,作为中、高纬度或高海拔地区土壤氮转化的重要驱动力,冻融作用对于土壤氮转化过程也存在极大影响。本文基于国内外已有研究成果,概述了土壤冻融循环次数、结冻持续时间以及结冻强度对于土壤氮转化过程的影响。总结出冻融格局的改变对土壤氮转化关系的一般规律：随着冻融格局的改变,均有利于土壤氮的矿化;冻融强度的增加可显著提高土壤硝态氮的含量;冻融格局的改变也会提高N₂O的排放。

Effects of Freeze-thaw on Soil Nitrogen Conversion: Research Progress

Nitrogen is one of the important nutrients limiting plant growth, and its transformation degree in soil is affected by many factors. As an important driving force for soil N transformation in mid, high latitude or high altitude areas, the effects of freeze-thaw also has a great impact on the process of soil N transformation. Based on existing research results at home and abroad, this paper summarized the effects of soil freeze-thaw cycles, freeze duration and freeze intensity on the process of soil N transformation. We summed up the general rules of soil N transformation caused by the changes of freeze-thaw patterns: changes in freezing and thawing patterns were all conducive to the mineralization of soil N. The increase of freeze-thaw intensity could significantly increase the content of soil nitrate N. Changes in freeze-thaw patterns will also increase N₂O emissions.