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草业学报 ›› 2023, Vol. 32 ›› Issue (9): 93-103.DOI: 10.11686/cyxb2022410

• 研究论文 • 上一篇    下一篇

模拟增温对无芒雀麦生长特性的影响

宫珂(), 靳瑰丽(), 刘文昊, 马建, 刘智彪, 李嘉欣, 李莹   

  1. 新疆农业大学草业学院,新疆草地资源与生态重点实验室,西部干旱荒漠区草地资源与生态教育部重点实验室,新疆 乌鲁木齐 830052
  • 收稿日期:2022-10-17 修回日期:2023-01-04 出版日期:2023-09-20 发布日期:2023-07-12
  • 通讯作者: 靳瑰丽
  • 作者简介:E-mail: jguili@126.com
    宫珂(1994-),女,新疆伊犁人,博士。E-mail: 1538095879@qq.com
  • 基金资助:
    国家牧草产业体系项目(CARS-34)

Effects of simulated warming on growth characteristics of Bromus inermis

Ke GONG(), Gui-li JIN(), Wen-hao LIU, Jian MA, Zhi-biao LIU, Jia-xin LI, Ying LI   

  1. College of Grassland Sciences of Xinjiang Agricultural University,Xinjiang Key Laboratory of Grassland Resources and Ecology,Key Laboratory of Grassland Resources and Ecology for Western Arid Desert Region,Ministry of Education,Urumqi 830052,China
  • Received:2022-10-17 Revised:2023-01-04 Online:2023-09-20 Published:2023-07-12
  • Contact: Gui-li JIN

摘要:

在全球气温升高以及极端气候出现频率加剧的背景下,野生牧草不同生长阶段展示出的生长特性,是探究牧草对增温应对模式的重要内容。本研究以新疆野生无芒雀麦为研究对象,通过野外模拟装置(OTC)对3个生长阶段(发芽期、幼苗期、繁殖期)进行3个增温处理(CK、W1、W2),分别测定发芽指标、幼苗生长指标、性状指标和生物量。结果表明:W2增温处理显著提高了发芽势和发芽速率,分别为CK的1.38和1.49倍(P<0.05);W1和W2增温抑制了幼苗叶长和根长,平均减小9.9%和43.3%,其中W1增温处理对叶长和根长的抑制作用更明显;W1增温对无芒雀麦生殖生长起到抑制作用,加强了对营养器官的投入,而W2增温下生殖生长更占优势;幼苗期地上和地下生物量生长模式从异速生长逐渐转变为等速生长,繁殖期则始终保持等速生长模式。综上,无芒雀麦3个生长阶段对增温响应具有差异,种子发芽和生殖生长得到促进,但幼苗生长被抑制;并从无芒雀麦植株个体生根开始保证了地下部分的积累,以此来实现其在增温环境下的存活和有性繁殖。研究结果可为摸清无芒雀麦不同生长阶段应对增温的适应性表现提供参考依据。

关键词: 草甸草原, 增温, 无芒雀麦, 营养生长, 生殖生长

Abstract:

The growth characteristics exhibited by wild forage grasses at different growth stages in the context of increasing global temperatures and the increased frequency of extreme weather occurrences are important elements in exploring the response patterns of forage grasses to warming. In this study, three temperature-increasing treatments (CK, W1, W2) were applied to three growth stages (germination, seedling and reproduction) by field simulation device (open-top chambers, OTC) to determine germination index, seedling growth index, trait index and biomass, respectively, using Bromus inermis in Xinjiang. The results showed that W2 temperature increase significantly increased emergence energy and emergence rate by 1.38 and 1.49 times compared to CK, respectively (P<0.05); W1 and W2 temperature increase inhibited seedling leaf length and root length by 9.9% and 43.3%, respectively, with the inhibitory effect of W1 temperature increase on leaf length and root length being more obvious. W1 temperature increase inhibited reproductive growth and enhanced inputs to nutritional organs in B. inermis, while reproductive growth was more dominant under W2 temperature increase. The above- and below-ground biomass growth patterns gradually changed from anisotropic to isotropic during the seedling stage; the isotropic growth pattern was maintained throughout the reproductive stage. In summary, the three growth stages of B. inermis responded differently to the temperature increase, and seedling emergence and reproductive growth were promoted, but seedling growth was suppressed; and from the time of rooting, B. inermis prefers to accumulate the energy of the underground part, which is used to ensure its survival and sexual reproduction in a warmed environment. The results of the study can be used as a reference for understanding the adaptability of B. inermis in different growth stages in response to temperature increase.

Key words: meadow steppe, warming, Bromus inermis, vegetative growth, reproductive growth