东平湖沉积物-菹草系统碳、氮、磷空间分布及化学计量特征
Spatial distribution and stoichiometric characteristics of C, N, P in the sediment-Potamogeton crispus system in Dongping Lake
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摘要: 为阐明东平湖沉积物-菹草生态系统营养元素的生态化学计量学特征及其指示意义，于2015年7月在全湖设置33个采样点，采集表层（0-5 cm）沉积物及菹草样品，分别对沉积物和菹草中TC、TN和TP含量进行测定与分析，探讨其空间分布及其生态化学计量学特征.结果表明，东平湖沉积物TC、TN和TP含量平均值分别为35.11 g·kg-1、1.98 g·kg-1和0.70 g·kg-1；菹草TC、TN和TP含量平均值分别为36.99 g·kg-1、2.22 g·kg-1和6.95 g·kg-1；沉积物TC、TN、TP和菹草TN、TP含量在空间分布上具有相似的特征，均表现为北湖区最高；沉积物TC、TN和TP两两之间均具有极显著正相关关系（P<0.01），表明沉积物中C、N、P具有同源性；生态化学计量学特征表明，沉积物中有机物质以外源输入为主，有机质分解不受氮元素的限制，而菹草生长则主要受氮元素限制.Abstract: In order to explore the ecological stoichiometric characteristics of nutrient elements and their significance in indicating the nutrient cycle in the sediment-Potamogeton crispus (P. crispus) system in Dongping Lake, surface sediment (0-5 cm) and P. crispus samples were simultaneously collected from 33 sampling sites in Dongping Lake in July 2015. The concentrations of total carbon (TC), total nitrogen (TN) and total phosphorus (TP) in the sediment and P. crispus samples were determined, then the spatial distribution and the ecological stoichiometric characteristics of carbon (C), nitrogen (N) and phosphorus (P) were discussed. The results showed that the average concentrations of TC, TN and TP were 35.11 g·kg-1, 1.98 g·kg-1 and 0.70 g·kg-1 respectively in the sediment, and 36.99 g·kg-1, 2.22 g·kg-1 and 6.95 g·kg-1 in P. crispus. The concentrations of TC, TN and TP in sediment and P. crispus had similar characteristics in spatial distribution, all of which were the highest in the north area of the Dongping Lake. There were significant positive correlations (P<0.01) between the TC, TN and TP concentrations in the sediment, indicating that the C, N and P in the sediment might originate from the same source. The ecological stoichiometric characteristics of nutrient elements in the sediment and P. crispus in Dongping Lake suggested that the organic matter in the sediment mainly come from the exogenous source, and the decomposition of organic matter wasn't restricted by the nitrogen, while the growth of P. crispus mainly depended on the supply of nitrogen.
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