›› 2013, Vol. 21 ›› Issue (4): 689-696.DOI: 10.11733/j.issn.1007-0435.2013.04.010

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Effect of Cultivated Switchgrass on the Growth of Associated Weed Biomass and Density at Different Growth Stages

AN Yu1, MA Yong-qing1,2, SHUI Jun-feng2, ZHONG Wen-jin1   

  1. 1. College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, China;
    2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi Province 712100, China
  • Received:2013-01-11 Revised:2013-03-11 Online:2013-08-15 Published:2013-08-14

栽培柳枝稷不同生长时期对伴生杂草生物量及密度的影响

安雨1, 马永清1,2, 税军峰2, 钟雯瑾1   

  1. 1. 西北农林科技大学资源环境学院, 陕西 杨凌 712100;
    2. 西北农林科技大学水土保持研究所 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西 杨凌 712100
  • 通讯作者: 马永清
  • 作者简介:安雨(1984- ),男,吉林长春人,博士研究生,主要从事植物生态学研究,E-mail: anyu04151205@sina.com
  • 基金资助:
    国家"十二五"农村领域国家科技计划课题"黄土丘陵沟壑区水土保持与高效农业关键技术集成与示范"(2011BAD31B05)资助

Abstract: Eight switchgrass (Panicum virgatum L.) varieties (Blackwell, Cave-in-Rock, Dakota, Forestberg, Illinois USA, Nebraska 28, Pathfinder and Sunburst) and their associated weeds were tested in this study. The inhibition rate (IR) and correlation were analyzed to identify the effects of switchgrass on the associated weed growth. Results indicated that most tested switchgrass varieties could suppress weed growth at the earlier growth season. Illinois USA was relatively lower IR (3.4%). Cave-in-Rock and Forestberg suppressed weed growth significantly as IR were 86.0% and 74.9%, respectively. After twice hand hoeing, Cave-in-Rock and Forestberg still suppressed the weed growth significantly (30th August), as IR were 85.7% and 95.7%, respectively. At the end of growth season (13th October), only Cave-in-Rock could suppress weed growth, the IR was 88.5%. In addition, there was a significant negative correlation between switchgrass aboveground biomass or root biomass and IR at 30th August (R2 =0.31, 0.54; P<0.05). However, the height, aboveground and root biomass of Cave-in-Rock significantly suppressed the individual weed biomass (r=-0.97,-0.99,-0.99, P<0.05), and the Forestberg mainly suppressed the weed density (r=-0.97, P<0.05).

Key words: Switchgrass, Weed, Biomass, Competition, Correlation analysis

摘要: 以陕西定边县引种的8个柳枝稷(Panicum virgatum L.)品种(Blackwell, Cave-in-Rock, Dakota, Forestberg, Illinois USA, Nebraska 28, Pathfinder和Sunburst)及行间杂草作为研究对象,通过计算柳枝稷对杂草的抑制率(RI),分析其生长指标与杂草生长指标的相关关系,判定不同柳枝稷品种在不同生育期对杂草生长的抑制效应,为其引种及田间杂草管理提供依据。结果表明:在生长初期(6月30日),Illinois USA杂草抑制率仅为3.4%,Cave-in-Rock 和Forestberg对杂草生长抑制率分别为86.0%和74.9%;经过2次人工除草后(8月30日),Cave-in-Rock和Forestberg的杂草抑制率分别为85.7%和95.7%;生长后期(10月13日),仅Cave-in-Rock对杂草生长有88.5%的抑制率。回归分析显示,生长中后期(8月30日),柳枝稷地上部及根系生物量显著影响对杂草的抑制率(R2=0.31, 0.54; P<0.05)。Pearson相关分析发现,Cave-in-Rock的株高、地上及根系生物量均显著降低杂草单株生物量(r=-0.97,-0.99,-0.99; P<0.05);Forestberg的植高与杂草密度显著负相关(r=-0.97, P<0.05)。

关键词: 柳枝稷, 杂草, 生物量, 竞争, 相关性

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