Root growth dynamics of Deyeuxia angustifolia seedlings in response to water level
Root growth dynamics of Deyeuxia angustifolia seedlings in response to water level
复制标题
沙叶幼苗根系生长动态对水位的响应
DOI：
10.1016/j.aquabot.2008.03.003
复制
发表时间：
2008-10-01
期刊：
影响因子：
1.8
通讯作者：
Ren, Bo
中科院分区：
文献类型：
--
作者：
Xie, Yonghong;Luo, Wenbo;Ren, Bo
通过温室试验，研究了三江平原沼泽植物小叶章（Deyeuxia angustifolia）的根系生长动态、植株生长、根系孔隙度和根系形态。本研究的目的是阐明这种植物如何调整其根系，以适应不同的水文环境。实验处理包括三个水深：-5，0和5厘米（相对于土壤表面）。生物量积累在-5cm（0.90 g/株）和0 cm（1.18 g/株）水深处理高于5cm（0.66 g/株）水深处理，表明高水位抑制了植物生长。0 cm水深处理的根冠比（0.67 vs.0.42-0.43）、不定根长（16 cm vs.12 -13 cm）、直径（0.47 mm vs.0.41 mm）和根数（167 vs.81 -119根/株）均高于高、低水深处理。水位升高导致主根孔隙度略有增加，但各处理的孔隙度均在7%左右。8周后，0、-5和5 cm水深处理的根系分别分布在14、11和7 cm土层中，表明高水位和低水位都导致浅根系。我们的数据表明D.沙枣根的形态和生长方式可以根据水位的变化进行调节，高水位下沙枣根的生物量减少，限制了其向根系扩散氧气的能力。(C)2008 Elsevier B. V.保留所有权利。
A greenhouse experiment was performed to investigate root growth dynamics, plant growth, root porosity and root morphology of a marsh plant Deyeuxia angustifolia, one of the dominant species in the Sanjiang Plain, China. The aim of this study was to elucidate how this plant adjusts its root system to acclimate to different hydrological environments. Experimental treatments included three water depths: -5, 0 and 5 cm (relative to the soil surface). Biomass accumulation was higher in the -5 cm (0.90 g per plant) and 0 cm water-depth (1.18 g per plant) than that in the 5 cm water-depth treatments (0.66 g per plant), indicating that plant growth was inhibited in the high water level. Root:shoot ratio (0.67 versus 0.42-0.43), the length (16 cm versus 12-13 cm) and diameter of adventitious roots (0.47 mm versus 0.41 mm), and root number (167 versus 81-119 number of roots per plant) were higher in the 0 cm water-depth than those in the high and low water-depth treatments. Enhanced water level led to slightly increased porosity of main roots, but porosity was about 7% in all treatments. After 8 weeks, roots had been distributed into 14, 11 and 7 cm soil depth in the 0, -5 and 5 cm water-depth treatments, respectively, indicating that both high and low water levels led to shallow root systems. Our data suggest that D. angustifolia can adjust root morphology and root growth pattern according to water level, and that this plant has limited oxygen diffusion potential to the roots due to the reduced biomass in the high water level. (C) 2008 Elsevier B.V. All rights reserved.