俄勒冈州东部刈割对美杜莎种子产量和生存力的影响

IF 2.4 3区环境科学与生态学 Q2 ECOLOGY

Rangeland Ecology & Management Pub Date : 2025-04-16 DOI:10.1016/j.rama.2025.03.003

William J. Price , April Hulet , K. Scott Jensen , Yanming Di , Jonathan B. Dinkins , Sergio A. Arispe

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引用次数: 0

摘要

入侵的一年生草medusahead (Taeniatherum caput-medusae) [L.][Nevski])降低了整个美国西部山艾树生物群系的生态系统功能。目前，关于水母的繁殖力和落叶处理（放牧和刈割）减少年种子产量的能力存在知识空白。本研究旨在1)确定脱叶时间是否会影响种子产量，2)评估脱叶对水母种子活力的影响。我们采用随机完全区组设计（n = 20），对俄勒冈州东南部近单一种植的美杜斯ahead进行了评估，在2019年至2022年期间（11月、3月和5月）对非落叶对照进行了三次落叶处理的效果。结果包括总种子产量、发芽统计和快速估计种子产量依赖于花序长度的线性回归。在所有年份中，我们没有发现11月或3月的落叶使种子产量相对于对照减少的证据(P >；0.05)。5月落叶组3年的种子产量均低于对照组(P <；0.05)。在所有处理-年组合中，水母叶的脱落对所产种子的活力没有影响，平均发芽率为80%。结果表明，每分蘖产粒数与花序长度呈显著正相关（R2 = 0.856），表明在今后的工作中可以使用一个广义方程来快速评估种子产量。本研究的结果表明，落叶的有效性是暂时有限的，最有效的处理仍可能无法在一定程度上减少种子产量。这些发现表明，落叶处理可能是最有效的，作为多方面的，以生态为基础的处理的一部分，以有效地管理山艾树生物群系中的medusahead。

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Assessing the Influence of Defoliation on Medusahead (Taeniatherum caput-medusae) Seed Production and Viability in Eastern Oregon

The invasive annual grass medusahead (Taeniatherum caput-medusae [L.] Nevski) degrades the ecosystem function throughout the sagebrush biome of the western United States. Currently, there are knowledge gaps regarding the fecundity of medusahead and the ability of defoliation treatments (grazing and mowing) to reduce annual seed production. Our research aimed to 1) determine if the timing of defoliation impacts the quantity of seeds produced, and 2) evaluate the impacts of defoliation on the viability of medusahead seeds produced. We used a randomized complete block design (n = 20) in a near-monoculture of medusahead located in southeast Oregon to assess the effectiveness of defoliation three times (November, March, and May) against a nondefoliated control from 2019 to 2022. Outcomes included gross seed production, germination statistics, and a linear regression to rapidly estimate seed production dependent on inflorescence length. We found no evidence that defoliation in November or March reduced seed production relative to the control in all years (P > 0.05). However, the May defoliation produced fewer seeds than the control in all 3 yr (P < 0.05). Defoliation of medusahead had no impact on the viability of seeds produced, with mean germination rates >80% in all treatment-year combinations. Findings did indicate that the number of seeds produced per tiller is strongly correlated with the length of inflorescence (R² = 0.856), indicating that a generalized equation could be used to rapidly assess seed production in future works. The results of this study demonstrate that the effectiveness of defoliation is temporally limited and that the most effective treatments may still fail to reduce seed production by a meaningful degree. These findings indicate that defoliation treatments may be most effective included as a part of multifaceted, ecologically based treatments to effectively manage medusahead in the sagebrush biome.

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来源期刊

Rangeland Ecology & Management 农林科学-环境科学

CiteScore

4.60

自引率

13.00%

发文量

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.