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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (36): 75-82.doi: 10.11924/j.issn.1000-6850.casb2023-0020

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Response of Soil Nitrogen Mineralization to Freeze-thaw under Straw Addition: Research Progress

LIN Zijun1(), LIU Wanling1, CHEN Yimin2, SUI Yueyu2, JIAO Xiaoguang1()   

  1. 1 College of Modern Agriculture and Eco-environment, Heilongjiang University, Harbin 150080
    2 Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081
  • Received:2022-12-21 Revised:2023-03-02 Online:2023-12-25 Published:2023-12-20

Abstract:

To clarify the effect of freeze-thaw on nitrogen mineralization in soil during the period of freeze-thaw in spring and autumn, and the effect of inorganic nitrogen released by nitrogen mineralization under straw returning on soil nitrogen pool in Northeast China. Based on a large number of literature related to nitrogen mineralization in China and abroad, the influence mechanism of freeze-thaw frequency, freeze-thaw intensity and soil moisture on nitrogen mineralization process were expounded. The effects of straw addition on nitrogen mineralization during non-freeze-thaw, and the responses of nitrogen mineralization rate and amount and soil inorganic nitrogen mass fraction to freeze-thaw under straw addition were clarified. The general rule of nitrogen mineralization process to freeze-thaw under straw addition was summarized. More organic nitrogen was released by straw fragmentation under freeze-thaw, reducing the negative effects of freeze-thaw on soil nitrogen mineralization and promoting the accumulation of inorganic nitrogen in soil. The water and heat preservation ability of straw could facilitate soil nitrogen mineralization by retaining more microbial biomass during freezing. This article briefly put forward the theoretical mechanism of nitrogen mineralization, as well as the problems and prospects of related research methods in the period of freeze-thaw under straw addition, in order to provide scientific basis for the study of soil nitrogen cycling under straw returning during freeze-thaw period in Northeast China.

Key words: freeze-thaw, straw addition, nitrogen mineralization, soil of northeast, soil nitrogen cycling