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首页> 外文学位 >Wear tolerance of seashore paspalum (Paspalum vaginatum Swartz) and hybrid bermudagrass (Cynodon dactylon x C. transvaalensis Burtt-Davy): Mechanisms and fertility influence
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Wear tolerance of seashore paspalum (Paspalum vaginatum Swartz) and hybrid bermudagrass (Cynodon dactylon x C. transvaalensis Burtt-Davy): Mechanisms and fertility influence

机译：海滨雀spa（Paspalumputumtumtum Swartz）和杂交百慕大草（Cynodon dactylon x C.transvaalensis Burtt-Davy）的耐磨性：机理和生育力影响

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摘要

Effects of traffic cause shoot tissue injury to turfgrass, resulting in reduced growth and quality. Information on inherent genetic mechanisms and influences of fertility on wear tolerance would be useful for selecting and managing turfgrasses in high traffic venues. This research was undertaken to assess overall wear tolerance within and among seashore paspalum ( Paspalum vaginatum Swartz.) ecotypes and bermudagrass hybrids ( Cynodon dactylon x C. transvaalensis Burtt-Davy), to determine the mechanisms that contribute to wear tolerance for both species, and to look at specific fertility influences on wear tolerance of seashore paspalum. The research was conducted at the University of Georgia Experiment Station in Griffin, GA. during 1997 and 1998. Wear injury was imparted by a traffic simulator and responses and rates of recovery were measured following the injury. Regression analysis determined that the most important mechanism related to enhanced wear tolerance in paspalum was reduced leaf total cell wall (TCW) content. In bermudagrass, high stem moisture and reduced stem cellulose content were associated with better wear tolerance. In both species, wear tolerance was enhanced by greater shoot moisture, density, and K concentration. In a separate study, it was determined that bi-weekly application of 15.6 kg K ha --1 or 22.4 kg Si ha--1 15.6 kg K ha --1 as potassium silicate enhanced wear tolerance of paspalum. Potassium action was attributed to enhanced shoot turgor and moisture content resulting from stomatal control. Silica may have reduced cuticular water loss, thereby enhancing shoot turgor, or may have provided greater rigidity to leaf tissues through deposition of Si crystals in leaf epidermal cells In another study, a significant increase in wear tolerance was observed in paspalum in response to 392 kg N ha--1 annually, with no response from K at rates up to 392 kg ha--1. It has been concluded that paspalum has a very high uptake and utilization efficiency for K This results in low. K requirements, but may also result in depletion of soil K due to high uptake rates.
机译：交通的影响引起草皮草的嫩芽组织损伤，导致生长和品质下降。有关内在遗传机制和生育力对耐磨性影响的信息，对于选择和管理高交通场所的草坪草是有用的。进行这项研究的目的是评估海滨雀spa（Paspalumputumtumtum Swartz。）生态型和百慕大杂种（Cynodon dactylon x C.transvaalensis Burtt-Davy）内和之间的整体耐磨性，以确定造成这两种物种耐磨性的机制，以及研究特定的生育率对海滨雀spa的耐磨性的影响。这项研究是在佐治亚州格里芬的乔治亚大学实验站进行的。在1997年和1998年期间。交通模拟器提供了磨损，并在受伤后测量了反应和恢复率。回归分析确定，与增强雀spa耐磨性有关的最重要机制是减少叶片总细胞壁（TCW）含量。在百慕大草中，较高的茎干水分和降低的茎干纤维素含量与更好的耐磨性有关。在这两个物种中，较高的枝条水分，密度和钾浓度提高了耐磨性。在另一项研究中，确定每两周施用15.6 kg K ha-1或22.4 kg Si ha-1-15.6 kg K ha-1作为硅酸钾可增强雀pa的耐磨性。钾的作用归因于气孔控制引起的枝条膨大和水分含量的增加。二氧化硅可能减少了表皮水分流失，从而增强了枝条的膨大性，或者可能通过在叶片表皮细胞中沉积硅晶体而为叶片组织提供了更大的刚性。在另一项研究中，响应392千克，雀pa的耐磨性显着提高每年N ha--1，最高392 kg ha--1的钾肥无响应。可以得出结论，雀for对K的吸收和利用效率非常高。钾的需求量，但由于摄取率高，也可能导致土壤钾的消耗。

著录项

  • 作者

    Trenholm, Laurie E.;

  • 作者单位

    University of Georgia.;

  • 授予单位 University of Georgia.;
  • 学科 Agronomy.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 163 p.
  • 总页数 163
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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