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首页> 外文期刊>Estuarine Coastal and Shelf Science >Geratology and decomposition of Spartina versicolor in a brackish Mediterranean marsh
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Geratology and decomposition of Spartina versicolor in a brackish Mediterranean marsh

机译：苦咸地中海沼泽中的云芝斯巴达纳（Spartina versicolor）的皮肤病学和分解

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Most studies on plant decomposition in salt marshes have been carried out in Spartina-dominated marshes in North America. In contrast, few have focused on marshes in Mediterranean systems. Moreover, research into litter decay in estuarine systems has been conducted with plant material collected before natural senescence and death. Here we followed the growth, senescence, leaf fall, and nutrient dynamics of Spartina versicolor to examine litter decay in a Mediterranean coastal system. We studied the dynamics of fungi, meiofauna and algae associated with detached S. versicolor litter, and the effect of the microenvironment (above and underneath wracks of dead Spartina) on decomposition. The exponential decay coefficient rate (k, day~(-1)) was higher for leaves attached to standing plants (0.0019) than after leaf abscission (0.0002— 0.001). The decomposition rate of detached leaves was highly variable and depended on the position of the litter. The large differences in decomposition rates between the two experimental conditions indicate that the microenvironment affected the associated litter community during the initial phase of decay. Water availability and high temperatures over the sediment surface increased the density of meiofauna and epiphyton and decreased fungal biomass during the first 20 days of the experiment. Fungal biomass was at the lower end of reported values, probably as a result of the drier conditions and high salinity in the Mediterranean marsh. Spartina versicolor detritus acted as a nutrient sink by immobilizing large amounts of N and P for at least one year.
机译：大多数有关盐沼中植物分解的研究都是在北美以斯巴蒂纳州为主的沼泽中进行的。相反，很少有人关注地中海系统的沼泽。此外，已经对在自然衰老和死亡之前收集的植物材料进行了河口系统凋落物腐烂的研究。在这里，我们跟踪了斑节天蛾的生长，衰老，叶片掉落和养分动态，以研究地中海沿岸系统凋落物的腐烂。我们研究了与杂色沙门氏菌凋落物相关的真菌，藻类和藻类的动力学，以及微环境（死斯巴迪纳的残骸的上方和下方）对分解的影响。附着在直立植物上的叶片的指数衰减系数率（k，day〜（-1））（0.0019）比脱落后的指数衰减系数（0.0002-0.001）高。离体叶片的分解速率变化很大，并且取决于凋落物的位置。两种实验条件之间分解速率的巨大差异表明，微环境在腐烂的初始阶段会影响相关的凋落物群落。在实验的前20天中，沉积物表面的水分供应和高温增加了动物群落和附生植物的密度，并减少了真菌生物量。真菌生物量处于报告值的低端，这可能是由于地中海沼泽地的干旱条件和高盐度导致的。杂色碎米草（Spartina versicolor detritus）通过固定化至少一年的大量N和P来作为养分汇。

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