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植物研究 ›› 2024, Vol. 44 ›› Issue (4): 590-601.doi: 10.7525/j.issn.1673-5102.2024.04.011

• 生理与生态 • 上一篇    

土壤灭菌、AM真菌接种与氮添加对柠条根际土壤的影响

李艺雪1, 叶冬梅1, 郝龙飞1(), 刘婷岩2, 段嘉靖3, 聂正英4   

  1. 1.内蒙古农业大学林学院,呼和浩特 010019
    2.内蒙古自治区林业科学研究院,呼和浩特 010010
    3.内蒙古包头市湿地保护中心,包头 014030
    4.万家沟林场国家油松良种基地,呼和浩特 010100
  • 收稿日期:2023-10-28 出版日期:2024-07-20 发布日期:2024-07-09
  • 通讯作者: 郝龙飞 E-mail:haolongfei_00@126.com
  • 作者简介:李艺雪(2000—),女,硕士研究生,主要从事林木菌根技术研究。
  • 基金资助:
    内蒙古自治区高等学校科学研究项目(NJZY22527);内蒙古农业大学青年教师科研能力提升专项(BR220136);内蒙古自治区科技计划项目(2022YFDZ0030);呼和浩特市重大科技专项(2022-社-重-4-2)

The Responses of Rhizosphere Soil of Caragana korshinskii under Soil Sterilization, AM Fungi Inoculation and N Addition

Yixue LI1, Dongmei YE1, Longfei HAO1(), Tingyan LIU2, Jiajing DUAN3, Zhengying NIE4   

  1. 1.College of Forestry,Inner Mongolia Agriculture University,Hohhot 010019
    2.Inner Mongolia Academy of Forestry Sciences,Hohhot 010010
    3.Inner Mongolia Baotou Wetland Protection Center,Baotou 014030
    4.Pinus tabuliformis National Seed Base of Wanjiagou Forestry Farm,Hohhot 010100
  • Received:2023-10-28 Online:2024-07-20 Published:2024-07-09
  • Contact: Longfei HAO E-mail:haolongfei_00@126.com

摘要:

基于土壤微生物可增强植物对全球变化的适应性,研究氮沉降背景下土壤微生物对根际土壤微生境生态化学计量特征的影响,进而探明生态化学计量特征变化对根际土壤微生物养分限制的调控规律。在土壤灭菌处理(灭菌土(+S)和非灭菌土(-S))基础上,对1年生柠条(Caragana korshinskii)盆栽苗木进行2种苗木接种AM真菌处理((接菌(+M)和未接菌(-M)),并设置氮添加处理(不施氮(CK)、低氮(LN,3 g·m-2·a-1)、高氮(HN, 6 g·m-2·a-1))。以非灭菌土未接菌条件下土壤原有微生物群落组成为基础,探究不同处理下微生境生态化学计量特征与微生物养分限制的关联性。结果如下:(1)灭菌土处理中,柠条菌根苗根际土壤中真菌相对丰度较非菌根苗在CK、LN和HN处理下分别显著提高了82.20%、25.00%和59.84%。(2)非灭菌土处理中,LN处理的柠条非菌根苗根际土壤微生物生物量碳磷比较CK处理降低了46.28%(P<0.05),而柠条菌根苗微生物生物量碳磷比较CK增加了56.76%(P<0.05)。(3)各氮添加处理下,灭菌土处理的柠条非菌根苗根际土壤与碳、氮相关土壤酶活性计量比,与碳、磷相关土壤酶活性计量比和向量长度均显著低于菌根苗(P<0.05)。(4)PLS-PM路径分析发现,微生物调控对微生物养分限制的总效应系数大于氮添加处理。综上,土壤原生菌和菌根真菌协同调节根际土壤酶化学计量比,进而增强土壤微生物养分限制对氮添加的适应。

关键词: 柠条, 微生物调控, 氮添加, 生态化学计量特征, 微生物养分限制

Abstract:

Based on the fact that soil microorganisms can enhance the adaptability of plants to global change, the effects of soil microorganisms on the ecological stoichiometric characteristics of rhizosphere soil microorganisms were studied under the background of nitrogen deposition, and then the regulation of changes in ecological stoichiometric characteristics on the soil microbial nutrient limitation was explored. Under the premise of soil sterilization treatment(sterilized soil(+S) and non-sterilized soil(-S)), one-year-old potted seedlings of Caragana korshinskii were inoculated in two ways(inoculation(+M) and without inoculation(-M)), and nitrogen addition treatments(no nitrogen application(CK), low nitrogen(LN, 3 g·m-2·a-1), high nitrogen(HN, 6 g·m-2·a-1)) were set up. Compared with the original microbial community composition in non-sterilized soil without fungus inoculation, the correlation between ecological stoichiometric characteristics of microhabitat and microbial nutrient limitation under different treatments was explored.Results were as follows: (1)In sterilized soil treatment, the relative abundance of fungi in the rhizosphere soil of C. korshinskii mycorrhizal seedlings was significantly increased by 82.20%, 25.00% and 59.84% under CK, LN and HN treatments than that of non-mycorrhizal seedlings, respectively. (2)In the treatment of non-sterilized soil, the microbial biomass carbon-to-phosphorus ratio in the rhizosphere soil of non-mycorrhizal C. korshinskii seedlings under LN treatment was lower by 46.28% compared to CK treatment(P<0.05), while that of mycorrhizal seedlings was 56.76% higher compared to CK treatment(P<0.05). (3)Under the nitrogen addition treatments, stoichiometry of carbon and nitrogen-related soil enzyme activity, stoichiometry of carbon and phosphorus-related soil enzyme activity, and vector length in the rhizosphere soil of C. korshinskii non-mycorrhizal seedlings under sterilized soil treatment were significantly lower than those of mycorrhizal seedlings(P<0.05). (4)PLS-PM path analysis showed that the total effect coefficient of microbial regulation on microbial nutrient limitation was greater than that of nitrogen addition treatment. In summary, soil indigenous microorganisms and mycorrhizal fungi synergistically regulated the enzymatic stoichiometric ratio of rhizosphere soil, and enhanced the adaptation of soil microbial nutrient limitation to nitrogen addition.

Key words: Caragana korshinskii, microbial regulation, nitrogen addition, ecological stoichiometry, microbial nutrient limitation

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