温度对 Huisache(Vachellia farnesiana (L.) Wight & Arn.)种子发芽

IF 2.4 3区 环境科学与生态学 Q2 ECOLOGY
Pablo C. Teveni III, Robert D. Cox, Caitlyn E. Cooper-Norris
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引用次数: 0

摘要

胡颓子(Vachellia farnesiana (L.) Wight & Arn.)是整个得克萨斯州南部牧场上的一种有害树种,其分布范围和密度正在不断扩大,部分原因是其种子产量很高。我们的目的是通过在四种温度处理中测试经过疤痕处理和未经过疤痕处理的种子,确定胡麻种子萌发的最佳昼夜波动温度条件:35/25、30/20、25/15 和 20/10°C。我们在生长室中交替使用 12 小时的光照/黑暗光周期,每天记录种子的萌发情况。通过完全随机设计的方差分析(并进行适当的事后检验),分析了每种温度处理下经疤痕处理和未经疤痕处理种子的萌发情况。虽然各温度处理下的总累积发芽率相似,但 20/10°C 温度处理下的种子发芽速度更慢。此外,经过疤痕处理的种子发芽更快,总发芽率更高。结果表明,胡枝子种子可在很宽的温度范围内发芽,温度低时发芽速度会减慢。由于我们发现胡枝子种子在温度较低时发芽较慢,因此园林管理人员可以考虑在天气转暖、转湿后优先控制新近发芽的幼苗。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Temperature Effects on Huisache (Vachellia farnesiana (L.) Wight & Arn.) Seed Germination

Huisache (Vachellia farnesiana (L.) Wight & Arn.) is a pest tree species on rangelands throughout South Texas and is expanding in range and density, due in part to prolific seed production. We aimed to determine the optimum diurnally-fluctuating temperature conditions for huisache seed germination by testing scarified and nonscarified seed in four temperature treatments: 35/25, 30/20, 25/15, and 20/10°C. We used alternating 12-hour light/dark photoperiods in a growth chamber, and seed germination was recorded daily. Germination of scarified and nonscarified seeds at each temperature treatment was analyzed via ANOVA for a completely randomized design (with appropriate posthoc tests). Although total cumulative germination percentages were similar among temperature treatments, seeds in the 20/10°C temperature treatment germinated more slowly. In addition, scarified seeds germinated more quickly, and with greater total percent germination. Results show that huisache seeds can be expected to germinate over a wide range of temperatures, with germination slowing when temperatures are low. Because we found huisache seeds germinated slowly in cooler temperatures, landscape managers may consider prioritizing control efforts of recently-germinated seedlings following warmer, wetter weather.

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来源期刊
Rangeland Ecology & Management
Rangeland Ecology & Management 农林科学-环境科学
CiteScore
4.60
自引率
13.00%
发文量
87
审稿时长
12-24 weeks
期刊介绍: Rangeland Ecology & Management publishes all topics-including ecology, management, socioeconomic and policy-pertaining to global rangelands. The journal''s mission is to inform academics, ecosystem managers and policy makers of science-based information to promote sound rangeland stewardship. Author submissions are published in five manuscript categories: original research papers, high-profile forum topics, concept syntheses, as well as research and technical notes. Rangelands represent approximately 50% of the Earth''s land area and provision multiple ecosystem services for large human populations. This expansive and diverse land area functions as coupled human-ecological systems. Knowledge of both social and biophysical system components and their interactions represent the foundation for informed rangeland stewardship. Rangeland Ecology & Management uniquely integrates information from multiple system components to address current and pending challenges confronting global rangelands.
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