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Seeding Causes Long-Term Increases in Grass Forage Production in Invaded Rangelands
Rangeland Ecology & Management ( IF 2.3 ) Pub Date : 2019-11-06 , DOI: 10.1016/j.rama.2019.10.008
Matthew J. Rinella , Alan D. Knudsen , James S. Jacobs , Jane M. Mangold

Seeding is sometimes used in attempts to increase grass forage production in invaded rangelands, but insufficient long-term data prevent determining if seeded grasses are likely to become and remain productive enough to justify this expensive practice. We quantified long-term seeding outcomes in a widespread Rocky Mountain foothill habitat invaded by leafy spurge (Euphorbia esula L.) and several exotic grasses. Fourteen yr after seeding, the most productive grass (bluebunch wheatgrass [Pseudoroegneria spicata (Pursh) Á. Löve]) produced 900 (100, 12 000) kg ha−1 [mean (95% CI)], which was about 70% of total plant community biomass. This result was not greatly altered by grazing according to an unreplicated, grazed experiment adjacent to our replicated ungrazed experiment. Regardless of treatment, E. esula gradually became less productive and seeded and unseeded plots produced similar E. esula biomass 14 yr after seeding. P. spicata reduced exotic grasses about 85%. Our results resemble those of another foothills study of another invasive forb (Centaurea stoebe L. ssp. micranthos [Gugler] Hayek) and a Great Plains study of E. esula, so foothills seeding outcomes seem somewhat insensitive to invader composition, and seeding can increase forage across much of E. esula’s range. While there is always some risk seeded grasses will fail to establish, our study combined with past studies identifies invaded habitats where seeded grasses have a good possibility of forming persistent, productive stands.



中文翻译:

播种使入侵牧场的草料产量长期增加

有时会使用播种来增加入侵牧场的草料产量,但是长期数据不足,无法确定播种的草是否有可能变得并保持足够的生产力以证明这种昂贵的作法是合理的。我们量化了在多叶的大戟(Euphorbia esula L.)和几种奇异草入侵的落基山山麓生境中长期播种的结果。播种后十四年,最高产的草(蓝麦草[ Pseudoroegneria spicata(Pursh)Á。Löve])产量为900(100,12 000)kg公顷-1[平均值(95%CI)],约占植物群落总生物量的70%。根据与我们复制的未磨边实验相邻的未复制的,放牧的实验,通过放牧并不会大大改变此结果。无论采用何种处理方法,大肠杆菌在播种后14年逐渐降低产量并播种,未播种的地块产生相似的大肠杆菌生物量。P. spicata减少了约85%的外来草。我们的研究结果类似于那些另一个侵入FORB的另一山麓研究(矢车菊stoebe L. SSP。micranthos [Gugler]哈耶克)和的大平原研究E. esula,因此,在丘陵地区播种的结果似乎对入侵者的构成不敏感,播种可以在整个大肠杆菌范围内增加草料。尽管总会有种草无法建立的风险,但我们的研究与以往的研究相结合,发现了入侵的生境,在这些生境中,种草极有可能形成持久的高产林分。

更新日期:2020-04-21
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