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首页> 外文期刊>Estuarine Coastal and Shelf Science >Response of a salt marsh plant to sediment deposition disturbance
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Response of a salt marsh plant to sediment deposition disturbance

机译：盐沼植物对沉积物沉积扰动的响应

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摘要

Salt marshes (a type of coastal wetland with herbaceous plants) are one of the most productive ecosystems. The organic matter accumulated by plants, together with deposition of inorganic mineral sediments, contributes to vertical marsh growth and determines the marsh ability to cope with regional sea level rise. Deposition of mineral sediment, in turn, alters the growth of plant roots and shoots, and further marsh morphology and blue carbon storage. Based on mesocosm experiments simulating the sedimentation intensity, this paper examined the responses of Spartina alterniflora (a plant widely distributed in global salt marshes) to sediment deposition events (0-24 cm thicknesses). The plant height increased by 1.51 cm on average with 1 cm sediment deposition. New roots grew into the deposited sediment layers, resulting in a significant increase in the below-ground biomass. The below-ground biomass doubled with the treatment of 24 cm deposition thickness in comparison with that without deposition. The depth-dependent distribution of below-ground biomass changed from a monotonous (decreasing with soil depth) to a non-monotonic (increasing first and then decreasing) trend. This illustrates the growth of marsh plants in response to sediment deposition disturbance (similar to artificial or storm-induced sediment deposition) and have important implications for further investigations on marsh resiliency, blue carbon storage and marsh morphology.
机译：盐沼（一种带有草本植物的沿海湿地）是生产力最高的生态系统之一。植物积累的有机物以及无机矿物沉积物的沉积，有助于垂直沼泽的生长，并决定了沼泽应对区域性海平面上升的能力。矿物沉积物的沉积反过来会改变植物根部和枝条的生长，进而改变沼泽的形态和蓝碳储量。基于模拟沉积强度的中观试验，本文研究了互花米草（一种分布在全球盐沼中的植物）对沉积物沉积（0-24厘米厚）的响应。沉积物沉积量为1 cm时，株高平均增加1.51 cm。新的根生长到沉积的沉积层中，导致地下生物量显着增加。与未沉积相比，采用24 cm沉积厚度处理的地下生物量增加了一倍。地下生物量的深度相关分布从单调（随土壤深度减少）变化为非单调（先增加然后减少）趋势。这说明了响应沉积物沉积扰动（类似于人工或风暴引起的沉积物沉积）而引起的沼泽植物的生长，这对于进一步研究沼泽的弹性，蓝碳储量和沼泽形态具有重要的意义。

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