欢迎访问《草业学报》官方网站,今天是 分享到:

草业学报 ›› 2021, Vol. 30 ›› Issue (11): 52-61.DOI: 10.11686/cyxb2020424

• 研究论文 • 上一篇    下一篇

土壤水分和植株密度互作对垂穗披碱草地下营养繁殖及生物量的影响

王玲玲(), 库努都孜阿依·吐鲁洪null, 孟广飞, 郭正刚()   

  1. 兰州大学草地农业生态系统国家重点实验室,兰州大学农业农村部草牧业创新重点实验室,兰州大学草地农业教育部工程研究中心,兰州大学草地农业科技学院,甘肃 兰州 730020
  • 收稿日期:2020-09-21 修回日期:2020-11-12 出版日期:2021-10-19 发布日期:2021-10-19
  • 通讯作者: 郭正刚
  • 作者简介:Corresponding author. E-mail: guozhg@lzu.edu.cn
    王玲玲(1997-),女,甘肃平凉人,在读硕士。E-mail: wangll2017@lzu.edu.cn
  • 基金资助:
    西藏自治区科技计划重大专项(XZ202101ZD003N);国家牧草产业系统岗位科学家(CARS-34)

Effect of soil moisture and plant density on vegetative propagation traits and biomass of Elymus nutans

Ling-ling WANG(), Kunduzay·Turgun, Guang-fei MENG, Zheng-gang GUO()   

  1. State Key Laboratory of Grassland Agro-ecosystems,Key Laboratory of Grassland Livestock Industry Innovation,Ministry of Agriculture and Rural Affairs,Engineering Research Center of Grassland Industry,Ministry of Education,College of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou 730020,China
  • Received:2020-09-21 Revised:2020-11-12 Online:2021-10-19 Published:2021-10-19
  • Contact: Zheng-gang GUO

摘要:

垂穗披碱草是高寒地区常见的优质牧草,主要以营养繁殖维持种群更新,然而植株密度和土壤水分互作是否影响其地下营养繁殖尚不清楚。本研究采用盆栽试验,分析了不同土壤水分和植株密度互作下垂穗披碱草地下营养繁殖(克隆小株数、传播距离和地下芽数量)和生物量的变化特征,其中土壤水分包括3个梯度,分别为土壤饱和含水量的30%(W1)、土壤饱和含水量的50%(W2)和土壤饱和含水量的80%(W3);植株密度包括3个梯度,分别为4株·盆-1(R1)、8株·盆-1(R2)和12株·盆-1(R3)。结果表明:随土壤水分增加,克隆小株数先增加后减小,但传播距离、地下芽数量、地下和地上生物量以及总生物量均呈增加趋势;随植株密度增加,克隆小株数、传播距离、地下芽数量、地上地下生物量以及总生物量均呈减小趋势。土壤水分和植株密度互作对克隆小株数、传播距离、地下芽数量、地上地下生物量、总生物量均具有显著的互作效应,理论上存在最佳的土壤水分和植株密度的组合模式,其中传播距离、地下芽数量、地上生物量以及总生物量的最佳组合方式为W3R1,而克隆小株数和地下生物量的最佳组合方式为W2R1。说明垂穗披碱草栽培草地的管理需要根据目标而确定其植株密度和土壤水分。

关键词: 克隆小株数, 传播距离, 地下芽, 生物量

Abstract:

Elymus nutans, a good quality forage, produces daughter plants through vegetative asexual propagation in the alpine region. However, it’s unclear whether interaction between plant density and soil moisture has an influence on the subterranean vegetative propagation of E. nutans. In this study, a pot experiment was carried out to analyze the pattern of change in subterranean vegetative propagation (ramet numbers, rhizome length and underground bud number per plant) and biomass of E. nutans under different combinations of soil moisture and plant density. There were three soil moisture treatments: 30% of field capacity (W1); 50% of field capacity (W2) and 80% of field capacity (W3), and three plant densities (4, 8, and 12 plants·pot-1; R1, R2 and R3, respectively). This study showed that with increase in soil moisture, ramets per plant at first increased and then decreased, whereas rhizome length, numbers of underground buds per plant, aboveground and belowground biomass and total biomass all increased. With increase in plant density, ramets per plant, rhizome length, numbers of underground buds per plant, aboveground and belowground biomass and total biomass all decreased. Significant interaction effects between soil moisture and plant density were observed for ramets per plant, rhizome length, numbers of underground buds per plant, aboveground and belowground biomass and total biomass. Based on the results of this study, the optimal treatment for development of rhizome length, numbers of underground buds per plant, and aboveground and total biomass was W3R1, while for ramets per plant and belowground biomass the optimal treatment was W3R1. This indicates that in management of E. nutans cultivated grassland, soil moisture should be considered when determining the ideal plant density.

Key words: ramets per plant, rhizome length, underground buds per plant, biomass