| 白石水库颗粒有机物及沉积物中碳、氮稳定同位素的空间分布特征 |
| 摘要点击 2512 全文点击 1776 投稿时间：2015-01-07 修订日期：2015-07-21 |
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| 中文关键词 白石水库 颗粒有机物 底泥沉积物 稳定同位素 空间分布 |
| 英文关键词 Baishi reservoirs particle organic matters sediments stable isotopes spatial distribution |
| DOI 10.13227/j.hjkx.20151214 |
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| 中文摘要 |
| 于2013年10月对辽宁省白石水库水质、颗粒有机物及底泥沉积物中δ13 C和δ15 N值的空间分布特征进行了研究. 结果表明:白石水库POC的平均浓度为(1.76±0.98) mg ·L-1; TP的平均浓度为(0.04±0.03) mg ·L-1; TN的平均浓度为(1.80±0.08) mg ·L-1, TP和POC从上游到下游呈现逐渐降低的趋势; TN的水平分布变化不大. 小型颗粒有机物的δ13 C值平均为(-24.6±0.9)‰; δ15 N值平均为(4.8±0.4)‰. 大型颗粒有机物的δ13 C值平均为(-22.5±0.9)‰; δ15 N值平均为(6.7±0.5)‰,颗粒有机物的δ13 C和δ15 N变化范围都很广,小型颗粒有机物的δ13 C和δ15 N值最大差异可达4.6‰和2.7‰,大型颗粒有机物的δ13 C和δ15 N值最大差异分别为3.3‰和1.8‰. 底泥沉积物的δ13 C值平均为(-24.2±1.2)‰; δ15 N值平均为(4.1±0.7)‰. 大型颗粒有机物与小型颗粒有机物之间的δ13 C和δ15 N值存在极显著正相关关系(P<0.01). 颗粒有机物和底泥沉积物中δ13 C和δ15 N值的水平分布具有由上游到下游逐渐增大的规律,颗粒有机物与沉积物之间的δ13 C和δ15 N值存在显著正相关关系(P<0.05). 垂直分布中,颗粒有机物的δ15 N值是表层大于底层,TN和大型颗粒有机物的δ15 N值呈显著正相关(P<0.05),POC与颗粒有机物的δ15 N值呈极显著正相关关系(P<0.01). 白石水库水中和沉积物中的有机质主要来源于浮游生物和土壤有机质,颗粒有机物的δ13 C值与POC和TP呈显著负相关(P<0.05). |
| 英文摘要 |
| Water quality and spatial distribution of stable isotopes in particle organic matters and sediments from Baishi reservoirs were produced in October, 2013. The results revealed that the average concentration of POC, TP and TN were (1.76±0.98), (0.04±0.03) and (1.80±0.08) mg ·L-1, respectively. In different water depths, the concentrations of POC and TN in surface were higher than those in deep layer, but the concentration of TP was opposite. The concentrations of POC and TP were reduced gradually from upstream to downstream, but the concentration of TN had no obvious change in horizontal distribution. The δ13 C and δ15 N values of small particle organic matters were (-24.6±0.9)‰ and(4.8±0.4)‰, the δ13 C and δ15 N values of large particle organic matters were (-22.5±0.9)‰ and (6.7±0.5)‰, both of which exhibited significant fluctuations. With the δ13 C and δ15 N values in small particle organic matters were different between each other of 4.6‰ and 2.7‰, and those in large particle organic matters were different between each other of 3.3‰ and 1.8‰. The δ13 C and δ15 N values of sediments were (-24.2±1.2) ‰ and (4.1±0.7) ‰. The results of correlation analysis indicated that there were positively significantly correlated relationships between the stable isotopes values of large particle organic matters with those of small particle organic matters (P<0.01). Horizontal distribution of δ13 C and δ15 N values in particle organic matters and sediments were increased gradually from upstream to downstream, and there were positively significantly correlated relationships between the stable isotopes values of particle organic matters with those of sediments (P<0.05). The δ15 N values of particle organic matters in water surface were higher than those in deep layer. The results of correlation analysis indicated that the δ15 N values of large particle organic matters were positive significantly correlated with the concentration of TN (P<0.05), and the δ15 N values of particle organic matters were positively significantly correlated with the concentration of POC in different water depths (P<0.01). The source of particle organic matters in water and sediments were plankton and soil organic horizons, the δ13 C values of particle organic matters were passively significantly correlated with the concentration of POC and TP (P<0.05). |
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