Assessing seed pellet formulations to improve native plant restoration under water‐limited conditions

IF 2.8 3区 环境科学与生态学 Q2 ECOLOGY
Thomas P. Munro, Todd E. Erickson, Dale G. Nimmo, Jodi N. Price
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Abstract

Water scarcity, a challenge expected to worsen with climate change, significantly hinders native plant community restoration. Enhancing seed‐based restoration requires methods to increase the water availability for seeds and seedlings. Surfactants and superabsorbent polymers (SAPs) can improve soil water‐holding capacity and infiltration, but their use in seed enhancements remains underexplored. We investigated whether pellets containing surfactants or SAPs could improve seedling emergence of two native species (Rytidosperma caespitosum and Chrysocephalum apiculatum) common in temperate grasslands in south‐eastern Australia under different watering treatments. We used a randomized block design with five watering treatments to simulate predicted changes in precipitation for south‐eastern Australia: ambient, two reducing overall water volume, and two reducing watering frequency while increasing watering volume to maintain ambient treatment water volume. We explored four enhanced pellets (two containing surfactants and two containing SAPs) and non‐pelleted seeds. Our results showed that watering events with larger volumes but reduced frequency increased seedling emergence. Under these conditions, block co‐polymer surfactants further increased seedling emergence of C. apiculatum, while synthetic SAP pellets promoted emergence of R. caespitosum. Block co‐polymer surfactants decreased R. caespitosum emergence, and both SAPs reduced C. apiculatum emergence under reduced watering frequency. A 50% reduction in overall water volume significantly reduced seedling emergence for both species, regardless of seed enhancement. These findings suggest that surfactants and SAP pellets can improve the success of seed‐based restoration under ambient conditions and when rainfall events are larger in volume but reduced in frequency, but not when the overall volume of rainfall is reduced.
评估种子颗粒配方,改善限水条件下的本地植物恢复工作
缺水这一挑战预计会随着气候变化而加剧,严重阻碍了本地植物群落的恢复。要加强以种子为基础的恢复工作,就必须采用各种方法来增加种子和幼苗的水分供应。表面活性剂和超吸水性聚合物(SAP)可提高土壤持水能力和渗透性,但它们在种子增殖中的应用仍未得到充分探索。我们研究了含有表面活性剂或 SAP 的颗粒是否能在不同的浇水处理下提高澳大利亚东南部温带草地常见的两种本地物种(Rytidosperma caespitosum 和 Chrysocephalum apiculatum)的出苗率。我们采用了五种浇水处理的随机区组设计来模拟澳大利亚东南部降水量的预测变化:常温处理、两种减少总水量的处理以及两种减少浇水频率同时增加浇水量以保持常温处理水量的处理。我们研究了四种强化颗粒(两种含有表面活性剂,两种含有 SAP)和非颗粒种子。结果表明,浇水量增大但频率降低可提高出苗率。在这些条件下,嵌段共聚物表面活性剂进一步提高了 C. apiculatum 的出苗率,而合成 SAP 粒料则促进了 R. caespitosum 的出苗率。在减少浇水次数的条件下,嵌段共聚物表面活性剂会降低草履虫的出苗率,而两种 SAP 都会降低 C. apiculatum 的出苗率。总水量减少 50%会显著降低这两种植物的出苗率,而与种子增殖无关。这些研究结果表明,在环境条件下,当降雨量较大但降雨频率较低时,表面活性剂和 SAP 颗粒可以提高种子恢复的成功率,但当总降雨量减少时则不能。
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来源期刊
Restoration Ecology
Restoration Ecology 环境科学-生态学
CiteScore
6.50
自引率
15.60%
发文量
226
审稿时长
12-24 weeks
期刊介绍: Restoration Ecology fosters the exchange of ideas among the many disciplines involved with ecological restoration. Addressing global concerns and communicating them to the international research community and restoration practitioners, the journal is at the forefront of a vital new direction in science, ecology, and policy. Original papers describe experimental, observational, and theoretical studies on terrestrial, marine, and freshwater systems, and are considered without taxonomic bias. Contributions span the natural sciences, including ecological and biological aspects, as well as the restoration of soil, air and water when set in an ecological context; and the social sciences, including cultural, philosophical, political, educational, economic and historical aspects. Edited by a distinguished panel, the journal continues to be a major conduit for researchers to publish their findings in the fight to not only halt ecological damage, but also to ultimately reverse it.
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