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Palynomorph distribution in a mangrove ecosystem along environmental and salinity gradient: a tool for palaeoecological reconstruction
Wetlands Ecology and Management ( IF 1.6 ) Pub Date : 2021-05-09 , DOI: 10.1007/s11273-021-09803-x
Jyoti Srivastava , Anjum Farooqui , Biswajeet Thakur , Priyanka Seth

Pollen assemblages closely reflect the local vegetation that characterizes the salinity status, providing useful analogs for paleoecologxical reconstruction in regional deposits. Palynological evidences of surface sediments from the Coringa mangrove wetland were correlated with the physicochemical and sediment salinity records to observe the relationship between them. The statistical analysis of the data obtained here revealed a marked horizontal salinity gradient from north to south.. In this study, ordination (detrended correspondence analysis) of palynomorph groups has identified a salinity gradient of 1.1 to 3.0 PSU from the north to the south in the wetland. High palynomorph deposition and lower salinity are observed along channel margins due to the mixing of estuarine water during the rainy season. The mudflats along the transects show a lower diversity of plants in the pollen record and high total dissolved solids (TDS) than commonly found in the coastal wetlands. The presence of scrubby halophytic vegetation in the upper saltmarsh and oligohaline-freshwater vegetation in the low tidal saline marshes is a zonation pattern related to the localized influence of freshwater conditions. Palynomarine Index (PMI) reveals the highest freshwater/tidal inundation along Ramannapalem due to the presence of numerous riverine channels while the remaining part of the wetland has restricted tidal inundation leading to the conversion of mangrove forests to salt pans and paddy fields. Thus, the health and productivity of the mangrove ecosystem are also governed by hydrodynamics, catchment land use, water discharge in the channels, and tidal flushing.



中文翻译:

沿环境和盐度梯度的红树林生态系统中的苔藓形态分布:古生态重建工具

花粉组合紧密地反映了表征盐度状态的当地植被,为区域沉积物中的古生态重建提供了有用的类似物。将Coringa红树林湿地表层沉积物的孢粉学证据与理化和沉积物盐度记录相关联,以观察它们之间的关系。对此处获得的数据进行统计分析后发现,盐度梯度从北向南呈显着水平。在这项研究中,古怪形态群的排序(趋势对应分析)确定了南北向南的盐度梯度为1.1至3.0 PSU。湿地。由于雨季期间河口水的混合,沿河道边缘观测到较高的粉状沉积物和较低的盐度。与沿海湿地中常见的情况相比,沿样带的滩涂显示出花粉记录中植物的多样性较低,总溶解固体(TDS)较高。低潮汐盐沼沼泽中盐渍地上杂草丛生的植被和淡水淡水植被是一种分区模式,与淡水条件的局部影响有关。Palynomarine指数(PMI)揭示了Ramannapalem沿岸最高的淡水/潮汐泛滥,这是由于存在大量河道,而湿地的其余部分限制了潮汐泛滥,导致红树林转化为盐田和稻田。因此,红树林生态系统的健康和生产力也受水动力,流域土地利用,河道排水和潮汐冲刷的支配。

更新日期:2021-05-09
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