确定水分供应减少对五种底层硬木树种种子萌发的影响

IF 3.7 2区 农林科学 Q1 FORESTRY
Charles J. Pell , Sammy L. King , Tracy Hawkins , Matt Symmank
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引用次数: 0

摘要

在全球范围内,洪泛平原森林正经历着与更干旱条件和洪水脉冲水文中断相关的物种组成变化。这些物种组成变化背后的具体过程尚不完全清楚,但干旱对种子萌发等再生过程的不同影响可能是部分原因。为了确定水分供应的减少如何影响不同洪泛平原树种的种子萌发,我们进行了一项实验室控制的萌发实验。实验研究了美国东南部和中南部洪泛平原森林中常见的树种的种子,这些树种的丰度因较干旱的水文地质条件而有所改变。这些种子包括糖莓(Celtis laevigata)和绿梣(Fraxinus pennsylvanica)的抗干燥种子或正统种子,以及过杯栎(Quercus lyrata)、水栎(Quercus nigra)和柳栎(Quercus phellos)的干燥敏感种子或顽固种子。每个物种的种子都用水势从 0.0 兆帕到-1.4 兆帕的八种渗透调节水溶液之一进行培养。水势的降低会减少种子萌发所需的水分。四周后,所有物种的种子萌发率都随着水势的降低而降低;然而,干燥耐受性与在较低水势下的萌发能力并不一致。东正教种子只在水势较高的处理中发芽。糖果树仅在 0.0 兆帕的对照处理中达到 30% 的发芽率,而白蜡树在低至 -0.4 兆帕的处理中也能达到 30% 的发芽率。相比之下,顽固的橡子在较低的水势下仍能继续发芽。水栎在所有处理下都能保持 30% 或更高的发芽率,柳栎在-0.8 兆帕时也能达到 30%。过杯栎是唯一对水势处理无反应的物种。在最大发芽率方面,糖莓和青灰比栎树平均早 9 天达到最大发芽率。这项研究结果与其他研究结果一致,都表明种子萌发成功与否对环境水势条件很敏感,而且物种在萌发特性上的具体差异与适应其分布区常见环境条件的更广泛的生活史策略有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Determining the effects of reduced water availability on seed germination of five bottomland hardwood tree species
Globally, floodplain forests are experiencing shifts in species composition associated with drier conditions and disruptions of flood pulse hydrology. The specific processes behind these shifts in composition are not fully understood, but differential effects of drought on regeneration processes such as seed germination may be partially responsible. To determine how reduced water availability impacts seed germination of different floodplain tree species, a lab-controlled germination experiment was conducted. Seeds from tree species common to floodplain forests of the southeastern and southcentral United States whose abundance have been altered by drier hydrogeomorphic conditions were examined. These seeds included desiccation resistant, or orthodox, seeds of sugarberry (Celtis laevigata) and green ash (Fraxinus pennsylvanica), and desiccation sensitive, or recalcitrant, acorns of overcup oak (Quercus lyrata), water oak (Quercus nigra), and willow oak (Quercus phellos). Seeds of each species were incubated with one of eight osmotically adjusted water solutions ranging in water potential from 0.0 MPa to −1.4 MPa. This reduction in water potential decreases the water available to the seeds for germination. After four weeks, seed germination of all species decreased with reduced water potential; however, desiccation tolerance did not correspond with the ability to germinate under lower water potential. Orthodox seeds only germinated in higher water potential treatments. Sugarberry reached 30 % germination in only the control 0.0 MPa treatment while green ash reached 30 % germination in treatments as low as −0.4 MPa. In contrast, recalcitrant acorns continued to germinate under lower water potentials. Water oak maintained 30 % or greater germination under all treatments and willow oak reached 30 % down to −0.8 MPa. Overcup oak was the only species to not respond to water potential treatment. With respect to maximum germination, sugarberry and green ash reached maximum germination an average of 9 days sooner than the oak species. The results of this study agree with others that demonstrate that seed germination success is sensitive to environmental water conditions and that species specific differences in germination traits are linked to broader life history strategies that are adaptive to common environmental conditions in their range.
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来源期刊
Forest Ecology and Management
Forest Ecology and Management 农林科学-林学
CiteScore
7.50
自引率
10.80%
发文量
665
审稿时长
39 days
期刊介绍: Forest Ecology and Management publishes scientific articles linking forest ecology with forest management, focusing on the application of biological, ecological and social knowledge to the management and conservation of plantations and natural forests. The scope of the journal includes all forest ecosystems of the world. A peer-review process ensures the quality and international interest of the manuscripts accepted for publication. The journal encourages communication between scientists in disparate fields who share a common interest in ecology and forest management, bridging the gap between research workers and forest managers. We encourage submission of papers that will have the strongest interest and value to the Journal''s international readership. Some key features of papers with strong interest include: 1. Clear connections between the ecology and management of forests; 2. Novel ideas or approaches to important challenges in forest ecology and management; 3. Studies that address a population of interest beyond the scale of single research sites, Three key points in the design of forest experiments, Forest Ecology and Management 255 (2008) 2022-2023); 4. Review Articles on timely, important topics. Authors are welcome to contact one of the editors to discuss the suitability of a potential review manuscript. The Journal encourages proposals for special issues examining important areas of forest ecology and management. Potential guest editors should contact any of the Editors to begin discussions about topics, potential papers, and other details.
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