单宁在植物-土壤氮循环中作用的研究进展

doi:10.11686/cyxb2019445

摘要/Abstract

摘要： 单宁是高等植物产生的次级代谢产物。单宁和单宁-有机氮络合物在植物与土壤间的氮循环过程中扮演着重要的角色。单宁参与氮素循环的机制主要包括络合有机氮、影响土壤微生物活性以及影响土壤酶活性。以往的研究并未深入探讨单宁对各种有机氮的络合能力,以及菌根真菌和腐生真菌对单宁-有机氮络合物的降解机制。因此,本研究着重讨论了单宁对各种有机氮的络合能力、络合物的降解机制、单宁对土壤酶活性的抑制作用以及单宁对土壤微生物的影响,并综述了单宁在氮循环过程中的作用,如减缓凋落物分解,抑制净氮矿化,影响净硝化和氮固持等。结果表明:单宁能够络合大部分有机氮;单宁的结构和浓度可显著影响其对土壤酶活性和净氮矿化的抑制效果以及对土壤微生物活性和多样性的作用,该结论可为进一步理解单宁在植物与土壤间氮循环过程中的角色奠定基础。

关键词: 单宁, 单宁-有机氮络合物, 氮循环, 土壤酶活性

Abstract: Tannins are secondary metabolites produced by higher plants. Tannins and tannin-linked organic nitrogen complexes play an important role in the nitrogen cycling at the plant-soil interface. The mechanisms by which tannins participate in the nitrogen cycling mainly include complexing organic nitrogen, affecting soil microbial activities and soil enzyme activities. Previous studies have not explored the complexation capacity of tannins to various organic nitrogen compounds, and the degradation mechanism of mycorrhizal fungi and saprophytic fungi on tannin-linked organic nitrogen complexes. Therefore, this review focuses on the complexation capacity of tannins to bind with various organic nitrogen compounds, the degradation mechanism of the complexes, the inhibition of soil enzyme activities by tannins and the influences of tannins on activities of soil microorganisms. Roles such as slowing of litter decomposition, inhibition of net nitrogen mineralization, and effects of tannins on net nitrification and nitrogen fixation in the nitrogen cycle is summarized. The findings of this review indicate that tannins can complex most of the organic nitrogen compounds; the structure and concentration of the tannins present can significantly affect the inhibitory actions of tannins on soil enzyme activities and net nitrogen mineralization, and soil microbial activity and diversity. These conclusions lay a foundation for further understanding of the role of tannins in nitrogen cycling at the plant-soil interface.

Key words: tannins, tannin-organic nitrogen complexes, nitrogen cycling, soil enzyme activity

宗文贞, 郭家昊, 贾云龙, 郑永兴, 杨旭, 胡芳弟, 王静. 单宁在植物-土壤氮循环中作用的研究进展[J]. 草业学报, 2020, 29(7): 174-183.

ZONG Wen-zhen, GUO Jia-hao, JIA Yun-long, ZHENG Yong-xing, YANG Xu, HU Fang-di, WANG Jing. Advances in research on the roles of tannins in plant-soil nitrogen cycling[J]. Acta Prataculturae Sinica, 2020, 29(7): 174-183.

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