相关实验视频
Updated: Jul 12, 2025

13:48
Design and Construction of an Urban Runoff Research Facility
Published on: August 8, 2014
13.1K
极端的降雨促进了对管理的草原的入侵
Hugh Ratcliffe1, Amy Kendig2, Sara Vacek3
1Department of Fisheries, Wildlife, and Conservation Biology, University of Minnesota, St. Paul, Minnesota, USA.
Ecology
|October 25, 2023
概括
极端潮湿的月份会促进高草草原的入侵物种,而干燥的月份则表现出不同的效果. 这项研究突出了降水模式的变化如何影响入侵植物的主导地位和本土草的丰富性.
科学领域:
- 生态生态学 生态生态学
- 气候变化生物学 气候变化生物学
- 侵袭性物种管理 侵袭性物种管理
背景情况:
- 气候变化加剧了极端天气事件,加剧了入侵物种等威胁.
- 土壤湿度极大地影响草原生态系统,干旱通常会阻碍,潮湿条件有利于入侵.
研究的目的:
- 调查极端潮湿和干燥降雨制度对北方高草草原入侵植物物种丰富性的影响.
- 确定降水模式的变化如何影响整体入侵丰度和特定的入侵草 (Poa pratensis, Bromus inermis).
主要方法:
- 美国明尼苏达州西部25个管理草原的长期监测 (2010-2019).
- 利用267个跨度和6675个图片来评估入侵物种的丰度.
- 量化了极度潮湿/干燥月份的频率与入侵物种丰度之间的关系.
主要成果:
- 异常潮湿的月份的发生率增加与更高的入侵物种丰度相关.
- 证据表明异常干燥的条件阻碍了入侵是混合的.
- 适度潮湿和干燥的两个月都导致本土草的丰富性减少.
结论:
- 极度潮湿的月份可能会加剧入侵物种在高草草原的主导地位.
- 干旱的几个月似乎没有抵消潮湿的几个月对入侵的影响.
- 这项研究量化了极端降水对管理生态系统入侵动态的复杂影响.
相关概念视频
Responses to Drought and Flooding
10.7K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
10.7K
Adaptations that Reduce Water Loss
25.6K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
25.6K
Ecological Succession
17.3K
Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
17.3K
Threats to Biodiversity
22.4K
There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
22.4K
Osmoregulation in Insects
16.2K
Malpighian tubules are specialized structures found in the digestive systems of many arthropods, including most insects, that handle excretion and osmoregulation. The tubules are typically arranged in pairs and have a convoluted structure that increases their surface area.
16.2K
Responses to Salt Stress
13.2K
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
13.2K

