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Analysing the influence of a large flood on eastern redcedar (Juniperus virginiana) distribution along the Missouri River using remote-sensing techniques
Ecohydrology ( IF 2.6 ) Pub Date : 2021-01-13 , DOI: 10.1002/eco.2279
Nadeesha D. Illeperuma 1 , Mark D. Dixon 1
Affiliation  

River floodplains are among the world's most altered ecosystems due to flow regulation by dams, development, and agriculture. Dam construction and flow regulation along the Missouri River have reduced flooding, modified geomorphic processes and altered floodplain vegetation. Since the commencement of flow regulation, eastern redcedar (Juniperus virginiana L.), which is native to upland areas, has invaded the understorey of cottonwood (Populus deltoides) forests along the Missouri River. A major flood in 2011, however, resulted in a significant die-off of redcedar within the Missouri National Recreational River (MNRR), South Dakota, and Nebraska, USA. The objectives of this study were to map and analyse the effects of the 2011 flood and soil drainage classes on redcedar distribution within the MNRR. The Normalized Difference Vegetation Index (NDVI) from winter scenes of Landsat satellite imagery was used to map the canopy cover of redcedar on pre- and post-flood dates. Logistic regression was used to analyse the effects of soil drainage and flooding status (flooded or non-flooded) on transitions between high (>20%) and low (<20%) canopy cover classes of redcedar. The odds of redcedar decline (from high to low canopy cover) were significantly greater in areas that flooded in 2011, and the odds of redcedar increase (low to high canopy cover) were greater on non-flooded surfaces with well-drained soils. This study produces evidence that large floods are important for constraining redcedar spread in floodplain habitats. In addition, soil drainage affects redcedar survival and spread within the study area, with colonization favoured on well-drained soils.

中文翻译:

使用遥感技术分析大洪水对密苏里河沿岸东部红杉 (Juniperus virginiana) 分布的影响

由于大坝、开发和农业对流量的调节,河流泛滥平原是世界上变化最大的生态系统之一。密苏里河沿岸的大坝建设和流量调节减少了洪水,改变了地貌过程并改变了漫滩植被。自流量调节开始以来,原产于高地地区的东部红柏(Juniperus virginiana L.)侵入了白杨Populus deltoides)的下层。) 密苏里河沿岸的森林。然而,2011 年的一场大洪水导致密苏里国家休闲河 (MNRR)、南达科他州和美国内布拉斯加州的红杉大量死亡。本研究的目的是绘制和分析 2011 年洪水和土壤排水等级对 MNRR 内红杉分布的影响。来自 Landsat 卫星图像冬季场景的归一化差异植被指数 (NDVI) 用于绘制洪水前和洪水后日期的红杉树冠覆盖情况。Logistic 回归用于分析土壤排水和淹水状态(淹水或未淹水)对红杉高 (>20%) 和低 (<20%) 冠层覆盖等级之间过渡的影响。在 2011 年洪水泛滥的地区,红杉下降的几率(从高到低的树冠覆盖)要大得多,在排水良好的非水淹地表上,红雪松增加的几率(从低到高的冠层覆盖)更大。这项研究提供的证据表明,大洪水对于限制红杉在洪泛区栖息地的传播很重要。此外,土壤排水影响红杉在研究区域内的存活和扩散,在排水良好的土壤上有利于定植。
更新日期:2021-01-13
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