Effects of temperature on phosphorus release in sediments of Hongfeng Lake, southwest China: an experimental study using diffusive gradients in thin-films (DGT) technique
Effects of temperature on phosphorus release in sediments of Hongfeng Lake, southwest China: an experimental study using diffusive gradients in thin-films (DGT) technique
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温度对中国西南部红枫湖沉积物中磷释放的影响：利用薄膜扩散梯度（DGT）技术的实验研究
DOI：
10.1007/s12665-015-4612-3
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发表时间：
2015-06
影响因子：
2.8
通讯作者：
Xu Yang
中科院分区：
文献类型：
--
作者：
Wang Jingfu;Chen Jingan;Ding Shiming;Luo Jing;Xu Yang
在模拟条件下研究了温度对红枫湖沉积物磷释放的影响。使用薄膜扩散梯度 (DGT) 技术（氧化锆 DGT）以二维亚毫米空间分辨率原位测量沉积物中不稳定磷的分布。采用化学分馏技术研究了不同温度下沉积物中P组分的变化，将沉积物中的P分为NH4Cl–P、BD–P、NaOH–P、HCl–P和残余P。结果表明，随着模拟温度的升高，沉积物中不稳定P的浓度迅速增加，反映了沉积物中P的快速释放。实验过程中沉积物中NaOH-P浓度下降幅度最大（占总下降量的79.3%），表明沉积物中活性P的增加主要是由于NaOH-P的转化所致。 HCl-P 的释放也发生在沉积物中，增加了孔隙水中的不稳定磷浓度。温度的季节变化及其引起的沉积物-水界面的生物化学变化（如有机物降解和呼吸作用）可能是影响红枫湖沉积物中磷释放的重要因素。我们的结果为阐明富营养化湖泊界面处磷的生物地球化学循环过程提供了新信息。
The effects of temperature on phosphorus (P) release in sediments of Hongfeng Lake, southwest China, were investigated under simulation condition. The distributions of labile P in sediments were measured in situ using a diffusive gradients in thin-films (DGT) technique (Zr-oxide DGT) at a two-dimensional, sub-millimeter spatial resolution. The changes of P fractions in sediments at different temperatures were also investigated using a chemical fractionation technique which divided sediment P into NH4Cl–P, BD–P, NaOH–P, HCl–P, and Residual P. The results showed that the concentrations of labile P in sediments increased rapidly as the simulating temperature increased, reflecting a rapid P release from sediments. The NaOH–P concentrations in sediments showed the greatest decrease (accounting for 79.3 % of total decrease) during the experiment, suggesting that the increase of labile P in sediments was mainly due to the transformation of NaOH–P. The release of HCl–P also occurred in sediments, increasing the labile P concentration in pore waters. The seasonal variation of temperature and its induced biological–chemical changes at the sediment–water interface (such as organic matter degradation, and respiration) might be an important factor affecting the P release in sediments of Hongfeng Lake. Our results provide new information for illuminating P biogeochemical cycling processes at the interface in eutrophic lakes.
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影响因子：
5
作者：
Risgaard-Petersen, Nils;Revil, Andre;Nielsen, Lars Peter
通讯作者：
Nielsen, Lars Peter
影响因子：
2.6
作者：
Li H;Liu L;Li M;Zhang X
通讯作者：
Zhang X
影响因子：
4.4
作者：
C. M. Santegoeds;T. Ferdelman;G. Muyzer;D. de Beer
通讯作者：
C. M. Santegoeds;T. Ferdelman;G. Muyzer;D. de Beer
影响因子：
4.4
作者：
M. Kühl;B. Jørgensen
通讯作者：
M. Kühl;B. Jørgensen
影响因子：
2.4
作者：
Hupfer, M;Gachter, R;Giovanoli, R
通讯作者：
Giovanoli, R