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草业学报 ›› 2023, Vol. 32 ›› Issue (12): 160-170.DOI: 10.11686/cyxb2023104

• 研究论文 • 上一篇    

铅卤钙钛矿泄漏对垂穗披碱草幼苗生长的影响

李庭伦1(), 李一亨1, 余慧1, 江再莉2, 唐立涛1, 王长庭1, 胡雷1()   

  1. 1.西南民族大学青藏高原研究院,四川 成都 610225
    2.小金县林业和草原局,四川 阿坝藏族羌族自治州 624099
  • 收稿日期:2023-04-04 修回日期:2023-05-08 出版日期:2023-12-20 发布日期:2023-10-18
  • 通讯作者: 胡雷
  • 作者简介:Corresponding author. E-mail: hl007873@163.com
    李庭伦(1997-),男,贵州普安人,在读硕士。E-mail: 2646270250@qq.com
  • 基金资助:
    国家自然科学基金(U20A2008);西南民族大学“双一流”项目(CX2023020)

Effects of the lead halide perovskite on the seedling growth of Elymus nutans

Ting-lun LI1(), Yi-heng LI1, Hui YU1, Zai-li JIANG2, Li-tao TANG1, Chang-ting WANG1, Lei HU1()   

  1. 1.Institute of Qinghai-Tibetan Plateau,Southwest Minzu University,Chengdu 610225,China
    2.Xiaojin County Forestry and Grassland,Aba Tibetan and Qiang Autonomous Prefecture 624099,China
  • Received:2023-04-04 Revised:2023-05-08 Online:2023-12-20 Published:2023-10-18
  • Contact: Lei HU

摘要:

本研究通过模拟铅卤钙钛矿泄漏导致的不同铅(Pb)胁迫梯度(0, 36, 72, 130, 170和260 mg·kg-1),监测高寒草甸优质牧草垂穗披碱草幼苗生长情况,重点分析Pb胁迫对垂穗披碱草幼苗Pb富集能力和耐受能力的影响。结果表明:1)垂穗披碱草的出苗率并未受到Pb胁迫梯度的显著影响,但出苗速率和出苗持续时间随Pb胁迫增加而显著降低;2)Pb胁迫显著抑制垂穗披碱草幼苗高度,但单株幼苗生物量则表现为浓度效应,小于72 mg·kg-1 Pb浓度作用不显著,大于72 mg·kg-1时表现为抑制作用,在260 mg·kg-1时无法萌发;3)垂穗披碱草幼苗的Pb富集能力显著降低,Pb耐受范围为68.42~205.94 mg·kg-1;4)结构方程模型表明,铅卤钙钛矿泄漏导致的Pb胁迫通过降低土壤pH和增加硝态氮含量改变垂穗披碱草幼苗生长情况,进而影响其Pb富集能力和耐受范围。土壤pH值和硝态氮含量是影响垂穗披碱草幼苗生长的重要因子,在铅卤钙钛矿泄漏情境下可以通过提高土壤pH增加其Pb耐受能力。

关键词: 铅胁迫, 垂穗披碱草, 幼苗生长, 铅富集能力, 耐受范围

Abstract:

In this study, the effects of the lead (Pb) halide perovskite on the growth of Elymus nutans, a high-quality forage, were determined. Seedlings of E. nutans were treated with perovskite at six concentrations (0, 36, 72, 130, 170, and 260 mg·kg-1 Pb2+), and their ability to accumulate and tolerate Pb was determined. The main results were as follows: 1)Pb did not significantly affect the emergence ratio of E. nutans seedlings, but increasing concentrations of Pb resulted in significantly decreased emergence rate and a shorter duration of seedling emergence. 2)Seedling height was significantly inhibited by Pb stress, while single seedling biomass showed a concentration effect, in that it was not affected by Pb2+ at concentrations below 72 mg·kg-1, but was inhibited by Pb at concentrations above 72 mg·kg-1. Seed germination was completely inhibited by Pb at 260 mg·kg-1. 3)The Pb accumulation ability of E. nutans seedlings decreased significantly compared with the control group, and the Pb tolerance range of seedlings was 68.42-205.94 mg·kg-1.4)The structure equation model indicated that decreased soil pH and increased soil nitrate nitrogen contents resulting from perovskite directly affected the seedling growth of E. nutans, thus affecting its ability to accumulate and tolerate Pb. In conclusion, the soil pH and nitrate nitrogen content are the key factors affecting the seedling growth of E. nutans, and increasing the soil pH is a feasible strategy to enhance the Pb tolerance of E. nutans in the face of potential leaks of the lead halide perovskite.

Key words: Pb stress, Elymus nutans, seedling growth, Pb accumulation ability, tolerance range