Nitrogen metabolism and antioxidant system responses of Suaeda salsa to nitrogen addition

IF 2.3 4区农林科学 Q1 AGRONOMY

Archives of Agronomy and Soil Science Pub Date : 2023-05-18 DOI:10.1080/03650340.2023.2214078

Shuyuan Wang, Yu Liu, Xiangfeng Ma, Qingqing Jiang, Guoguang Wang

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引用次数: 0

Abstract

ABSTRACT There are serious problems with degradation of Suaeda salsa (S. salsa) in Liaohe estuary wetland, Liaodong Bay, Northeast China, which may be mainly caused by the high nitrogen runoff of the upstream ecosystem. This study investigated the effect of nitrogen addition on the nitrogen transformation of S. salsa and soil by 15N labeling technology and the oxidative stress to S. salsa, thereby exploring the cause of the degradation. The dry weight (by 45.2%–67.3%) of S. salsa and the abundance of ammonium monooxygenase (amoB) (by 62%–75%) gene in soil decreased under high concentration of nitrogen conditions. The dissolved organic nitrogen (DON) (by 3%–14.2%) and total nitrogen (TN) (by 75%–89.7%) content in soil increased with increasing nitrogen addition. The hydrogen peroxide (by 5.9%–14.6%) and malondialdehyde (MDA) (by 9.6%–14.7%) content of S. salsa increased with increasing nitrogen addition. Therefore, high concentration of nitrogen not only decreased the biomass of S. salsa but also caused the waste of nitrogen source. High concentration of nitrogen weakened the nitrification of soil microorganisms and caused oxidative stress to S. salsa. The addition of high concentration of nitrogen was evidenced to be one of the main reasons for the degradation of S. salsa in the present study.

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碱蓬的氮代谢及抗氧化系统对氮添加的响应

摘要东北辽东湾辽河河口湿地碱蓬存在严重的退化问题，其主要原因可能是上游生态系统的高氮径流。本研究采用15N标记技术研究了施氮对莎草和土壤氮素转化的影响，以及对莎草的氧化应激，从而探讨了莎草降解的原因。在高浓度氮条件下，土壤中莎草的干重（减少45.2%–67.3%）和铵单加氧酶（amoB）基因的丰度（减少62%–75%）降低。土壤中溶解有机氮（DON）（增加3%-14.2%）和总氮（TN）（增加75%-89.7%）含量随施氮量的增加而增加。随着施氮量的增加，莎草的过氧化氢（增加5.9%-14.6%）和丙二醛（增加9.6%-14.7%）含量增加。因此，高浓度的氮不仅降低了莎草的生物量，而且造成了氮源的浪费。高浓度的氮削弱了土壤微生物的硝化作用，对莎草产生氧化应激。在本研究中，高浓度氮的添加被证明是莎草降解的主要原因之一。

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来源期刊

Archives of Agronomy and Soil Science AGRONOMY-SOIL SCIENCE

CiteScore

5.50

自引率

4.20%

发文量

107

期刊介绍： rchives of Agronomy and Soil Science is a well-established journal that has been in publication for over fifty years. The Journal publishes papers over the entire range of agronomy and soil science. Manuscripts involved in developing and testing hypotheses to understand casual relationships in the following areas: plant nutrition fertilizers manure soil tillage soil biotechnology and ecophysiology amelioration irrigation and drainage plant production on arable and grass land agroclimatology landscape formation and environmental management in rural regions management of natural and created wetland ecosystems bio-geochemical processes soil-plant-microbe interactions and rhizosphere processes soil morphology, classification, monitoring, heterogeneity and scales reuse of waste waters and biosolids of agri-industrial origin in soil are especially encouraged. As well as original contributions, the Journal also publishes current reviews.