Ecohydrology & Hydrobiology ( IF 2.6 ) Pub Date : 2021-02-26 , DOI: 10.1016/j.ecohyd.2021.02.004 Daniel Dunea , Petre Bretcan , Larisa Purcoi , Danut Tanislav , Gheorghe Serban , Aurora Neagoe , Virgil Iordache , Ștefania Iordache
Riparian vegetation provides a wide range of ecosystem services including water quality regulation, flooding avoidance, and the natural control of stream temperatures. Changes in land use and the increase of anthropogenic activities in the proximity of rivers affect the growth and development of riparian buffers. The aim of the work was to assess the effects of riparian vegetation on the evapotranspiration processes and the water quality of small plain streams using remote sensing resources and in-situ monitoring. The area of study considered two neighboring basins of small plain streams (Glavacioc and Ilfov) from Romania. The data obtained from in-situ monitoring performed in 2019 was used in the Penman-Monteith algorithm to calculate the potential evapotranspiration (PET) based on a series of specific parameters. The Green Normalized Difference Vegetation Index (GNDVI), computed from LANDSAT 8 images, has been used to assess the vegetation status at the basin scale. The GNDVI fluctuations were linked to the variations in precipitation regimes and land use modifications. Remote sensing data have shown changes in GNDVI between June and September 2019 in both riparian areas resulting in an intense spread of cattail (Typha spp.). Surface waters arriving at the entrance control sections had a basic pH and were loaded with nitrates and ammonium ion (NH4+), which had decreased at the downstream section after passing the cattail phytosociological associations and the riparian patches, thus acting as buffer areas. The current anthropogenic pressures on the riparian areas might have degenerative effects on the integrity of the vegetation structure. Thus, for effective and sustainable management, it is essential to identify the main stressors and to assess to what extent they affect the riparian ecosystem as a whole.
中文翻译:
河岸植被对平原小溪流蒸发蒸腾过程和水质的影响
河岸植被提供广泛的生态系统服务,包括水质调节、洪水避免和溪流温度的自然控制。河流附近土地利用的变化和人为活动的增加会影响河岸缓冲区的增长和发展。这项工作的目的是利用遥感资源和原位监测评估河岸植被对蒸发蒸腾过程和小型平原溪流水质的影响。研究区域考虑了来自罗马尼亚的两个相邻的小型平原流域(Glavacioc 和 Ilfov)。从现场获得的数据Penman-Monteith 算法使用 2019 年进行的监测,根据一系列特定参数计算潜在蒸散量 (PET)。根据LANDSAT 8 图像计算的绿色归一化差异植被指数(GNDVI) 已用于评估流域尺度的植被状况。GNDVI 的波动与降水状况的变化和土地利用的变化有关。遥感数据显示,2019 年 6 月至 2019 年 9 月期间,两个河岸地区的 GNDVI 发生了变化,导致香蒲(香蒲属)的大量传播。到达入口控制部分的地表水具有碱性 pH 值,并含有硝酸盐和铵离子 (NH 4 +),在经过香蒲植物社会学协会和河岸斑块后,下游部分减少,从而起到缓冲区的作用。当前对河岸地区的人为压力可能对植被结构的完整性产生退化影响。因此,对于有效和可持续的管理,必须确定主要压力源并评估它们在多大程度上影响整个河岸生态系统。