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首页> 外文期刊>Environmental Science and Pollution Research >Coupling characteristics and environmental significance of nitrogen, phosphorus and organic carbon in the sediments of Erhai Lake
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Coupling characteristics and environmental significance of nitrogen, phosphorus and organic carbon in the sediments of Erhai Lake

机译：洱海沉积物中氮，磷和有机碳的偶联特征及环境意义

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摘要

The contents and forms of nitrogen (N), phosphorus (P), and organic carbon (C) were determined with 40 cm (approximately 1600 s) core sediments from Erhai Lake on the Yungui Plateau of China as the sample. The vertical distribution characteristics, coupling relationships and ecological indicator significance of C-N-P were studied and identified. The results showed that the total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP) contents were in the ranges of 1436-8255 mg·kg~(-1), 1287-5462 mg·kg~(-1), and 870.26-1507.74 mg·kg~(-1), respectively. In the Erhai Lake sediments, the main forms of TOC, organic nitrogen (ON) and organic phosphorus (OP) were humus, TN, and TP, respectively. The deposition of C, N, and P in the Erhai Lake sediments was divided into four periods. In the initial development period (from 40 to 23 cm), C, N and P were deposited and released synchronously; the main form of N was nontransferable total nitrogen (NTN), and that of P was inorganic phosphorus (IP). In the ecological recovery period (from 22 to 14 cm), C and N were deposited synchronously, and their deposition amounts were more than that of P. C, N and P were released synchronously. The main form of N was transferable total nitrogen (TTN), and that of P was IP. In the rapid economic growth period (from 13 to 0 cm), C, N, and P were deposited and released synchronously; the main form of N was NTN, and that of P was OP. In comparison to the other periods, this period was a period of higher active soil organic carbon (ASOC). In the integrated management period (surface sediment), C and N were deposited and released synchronously, and their deposition amounts were greater than that of P. The main form of N was NTN, that of P was OP, and the ASOC content was high. When exogenous inputs were the main sources of C, N, and P, the deposition forms of P and N were mainly OP and NTN, respectively, and those of IP and TTN were calcium-bound P (Ca-P) and ion-exchange form N (IEF-N), respectively. When endogenous inputs were the main sources of C, N and P, the deposition forms of P and N were mainly IP and TTN, respectively, and those of IP and TTN were Fe/Al-P and weak acid extractable form (WAEF-N), respectively. The content ratio of Ca-P and Fe/Al-P, as well as that of IEF-N and WAEF-N, could reflect the changes in the contribution of endogenous and exogenous sources to the Erhai Lake sediments.
机译：氮（N），磷（P）和有机碳（C）的内容物和形式用来自中国Yungui高原的Erhai Lake的40cm（约1600秒）核沉积物测定。研究并鉴定了C-N-P的垂直分布特性，耦合关系和生态指标意义。结果表明，总有机碳（TOC），总氮（TN）和总磷（TP）含量为1436-8255mg·kg〜（-1），1287-5462 mg·kg〜（ -1）和870.26-1507.74 mg·kg〜（-1）。在洱海沉积物中，TOC，有机氮（ON）和有机磷（OP）的主要形式分别是腐殖质，TN和TP。洱海沉积物中的C，N和P的沉积分为四个时期。在初始开发期间（40至23厘米），C，N和P同步沉积并释放; n的主要形式是非可转移的总氮（NTN），P的N是无机磷（IP）的。在生态恢复期（22至14厘米）中，同步沉积C和N，并且它们的沉积量大于P.C，N和P同步释放。 N的主要形式是可转移的总氮（TTN），P的IP是IP。在快速的经济增长期（从13至0cm），C，N和P同步沉积和释放; n的主要形式是NTN，p的OP是OP。与其他时期相比，该时期是高活性土壤有机碳（ASOC）的时期。在综合管理期间（表面沉积物），同步沉积和释放C和N，它们的沉积量大于P. n的主要形式是NTN，P是OP的，ASOC含量高。当外源输入是C，N和P的主要来源时，P和N的沉积形式分别主要是OP和NTN，IP和TTN的钙和TTN是钙结合的P（CA-P）和离子交换分别形成n（IEF-N）。当内源性输入是C，N和P的主要来源时，P和N的沉积形式分别主要是IP和TTN，IP和TTN的TTN是Fe / Al-P和弱酸可提取的形式（WAEF-N ）， 分别。 Ca-P和Fe / Al-P以及IEF-N和WAEF-N的含量比可以反映内源性和外源来源对洱海沉积物的贡献的变化。

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