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首页> 外文期刊>Marine ecology progress series >Effects of eutrophication on salt marsh root and rhizome biomass accumulation
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Effects of eutrophication on salt marsh root and rhizome biomass accumulation

机译：富营养化对盐沼根和根茎生物量积累的影响

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The root:shoot ratio of grassland plants may be lower in high fertility sites than in low fertility sites as plants modify their root, rhizome and shoot morphologies (and masses) to suit prevailing nutrient availability. We conducted geographically diverse and regionally specific field sampling and measured above- and belowground plant biomasses in western Atlantic and Gulf of Mexico salt marshes to determine whether there is a similar morphological response in Spartina alterniflora, the dominant salt marsh plant. Coastal nutrient addition/enrichment, which is widespread and ongoing, may lower root and rhizome biomass, belowground production and organic accumulation in this species. Higher soil respiration and a lower Eh (redox potential) are expected additional soil property changes. The addition of P, more than of N, seems to reduce root and rhizome biomass accumulation. The cumulative effects of increased nutrient loadings on salt marshes may be to decrease soil elevation and accelerate the conversion of emergent plant habitat to open water, particularly on the lower marsh. The recommendations for management practices Intended to conserve coastal marshes include reducing nutrient loading to coastal zones, solving water quality problems with a multiple nutrient approach, and choosing monitoring metrics that are based on both above- and belowground plant biomass.
机译：高肥力地区的草地植物的根：茎比可能会比低肥力地区的更低，因为植物会改变其根，根茎和枝条形态（和质量）以适应当前的养分供应。我们进行了地理上不同且区域特定的田间采样，并测量了西大西洋和​​墨西哥湾盐沼的地上和地下植物生物量，以确定在主要的盐沼植物互花米草中是否存在相似的形态响应。沿海养分的添加/富集广泛且持续进行，可能会降低该物种的根和根茎生物量，地下产量和有机积累。预计更高的土壤呼吸和更低的Eh（氧化还原电势）会导致其他土壤特性变化。与氮相比，磷的增加似乎减少了根和根茎生物量的积累。营养盐负荷增加对盐沼的累积影响可能是降低土壤海拔并加速将紧急植物生境转化为开放水域，特别是在低层沼泽地。旨在保护沿海沼泽地的管理措施建议包括：减少沿海地区的养分含量，采用多种养分方法解决水质问题，并选择基于地上和地下植物生物量的监测指标。

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