Response of Coastal Plants to Salt Water Intrusion

沿海植物对盐水入侵的反应

• 批准号: 8908240
• 负责人: Leonel Sternberg
• 金额: $ 24.19万
• 依托单位: University of Miami
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-10-15 至 1993-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8908240&HistoricalAwards=false
• 关键词: Response; Coastal; Plants; Salt; Water

Southern Florida's relatively shallow freshwater table in a porous substrate, (oolitic limestone), is particularly susceptible to ocean water intrusion. Other than gross effects, little is known about more subtle effects and processes responsible for this intrusion. It is well known that pumping of ground water to supply expanding urban areas and canal building have contributed to intrusion problems. Several questions about salt water intrusion remain to be answered, however. For example, Is there a seasonality of intrusion; dry season versus wet season? If ocean levels are rising because of global climatic changes, is this effect already detectable in coastal plant communities of southern Florida? What about the effect of salt water intrusion in plant communities; will this mean an increase in exotic pest plants? The proposed research addresses such questions. The results of this research will answer many basic scientific questions about how plants react to periodic and chronic salt water stress. The research will rely heavily on stable isotope analysis of plant biomass. Recently much has been learned about biological systems with this technique. Stable isotope analysis will shed light on the history of salt water intrusion in plant communities. In addition, stable isotope techniques can be used to integrate hydrological and ecophysiological concepts in the study of salt water intrusion. The potential applications of this research are quite clear. Much of the salt water intrusion in southern Florida is caused by water management projects. This research can aid in predicting more precisely the effects of water management strategies. As an example; if ocean water intrusion is seasonal, then an appropriate strategy would be limitation of freshwater pumping during the dry season. Further, the experimental techniques to be used here will permit the detection of salt water intrusion in plant communities before irreversible changes occur.

南佛罗里达相对较浅的淡水表， 多孔基质（鲕状石灰岩），特别是 容易受到海水入侵的影响 除了严重的影响， 对更微妙的影响和过程知之甚少 对这次入侵负责 众所周知， 地下水供应不断扩大的城市地区和运河建设 造成了入侵问题。 的几个问题 然而，盐水入侵仍有待解决。 为 例如，入侵是否有季节性;旱季与 雨季？ 如果海平面上升是因为全球变暖 气候变化，这种影响是否已经在沿海地区检测到？ 佛罗里达南部的植物群落 那么， 盐水入侵植物群落;这是否意味着 外来有害植物的增加 拟议的研究涉及 这样的问题。 这项研究的结果将回答许多基本的问题。 关于植物如何对周期性和 慢性盐水胁迫 这项研究将严重依赖于 植物生物量稳定同位素分析。 最近， 用这种技术来了解生物系统。 稳定 同位素分析将揭示盐水的历史 入侵植物群落。 此外，稳定同位素 技术可以用来整合水文和 盐水入侵研究中的生态生理学概念。 这项研究的潜在应用是非常清楚的。 佛罗里达南部的盐水入侵大部分是由 水管理项目。 这项研究可以帮助预测 更确切地说，是水资源管理战略的影响。 作为 例如，如果海水入侵是季节性的， 适当的战略是限制淡水抽水 在旱季。 此外，实验技术， 将允许检测盐水入侵， 植物群落在不可逆转的变化发生之前。