Dynamics and chemistry of dissolved organic carbon in Precambrian Shield catchments and an impounded wetland
Dynamics and chemistry of dissolved organic carbon in Precambrian Shield catchments and an impounded wetland
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前寒武纪地盾流域和蓄水湿地溶解有机碳的动力学和化学
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
N. Roulet
中科院分区：
文献类型：
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作者：
T. Moore;L. Matos;N. Roulet
我们研究了安大略省实验湖地区旱地和湿地流域4年来溶解有机碳(DOC)及其化学组份的源、汇和通量。在旱地集水区，DOC的主要来源是降水、植被和土壤有机质，导致夏季(6~10月)DOC出口量为2.1g·m-2。泥炭孔隙水中DOC浓度变化范围为20~60 mg·L-1，与水文途径有关。湿地流域DOC出口量为0.8~5.7g·m-2，泥炭地流域DOC出口量估计为28~30g·m-2。在一个流域的泥炭地段，水淹至1.2m深，导致孔隙水和池塘DOC浓度增加，这归因于植物组织和泥炭的分解。由于只有14%的集水区被淹，蓄水并没有导致DOC出口的显著增加。酸性馏分中DOC含量在85%~93%之间，中性馏分中有少量DOC。淹水使泥炭孔隙水中亲水性中性组分的比例在淹水后2年内增加。简历：nous avons etudie les Sources，Les pertes et les flow du Carone Organique Dissous(DOC)et de Ses Fractions Chimiques Pendant une Periode de 4 Ann dans des Basins versants des terres haits et des terres humiddes de la Region des lacs exestentaux(实验湖区)。这句话的意思是：“植物和有机土壤、自然环境和自然环境。”
We examined the sources, sinks, and fluxes of dissolved organic carbon (DOC) and its chemical fractions over a 4-year period in upland and wetland catchments in the Experimental Lakes Area, Ontario. In an upland catch- ment, the major sources of DOC were precipitation, vegetation, and soil organic matter, resulting in a summer (June to October) export of 2.1 g·m -2 . DOC concentrations in peat pore water ranged from 20 to 60 mg·L -1 and were related to hydrologic pathways. DOC export from catchments containing wetlands ranged from 0.8 to 5.7 g·m -2 and export from the peatland portion of the catchment was estimated to be 28-30 g·m -2 . Flooding to a depth of 1.2 m in the peatland section of one catchment resulted in an increase in pore-water and pond DOC concentrations, attributed to the decom- position of plant tissues and peat. Because only 14% of the catchment was flooded, impoundment did not result in a significant increase in DOC export. Between 85 and 93% of DOC was contained in the acid fractions, with small amounts in the neutral fractions. Flooding increased the proportion of the hydrophilic neutral fraction in peat pore waters for 2 years after flooding. Resume : Nous avons etudie les sources, les pertes et les flux du carbone organique dissous (DOC) et de ses fractions chimiques pendant une periode de 4 annees dans des bassins versants des terres hautes et des terres humides de la Region des lacs experimentaux (« Experimental Lakes Area ») en Ontario. Dans un bassin versant des terres hautes, les sources principales de DOC sont les precipitations, la vegetation et la matiere organique du sol, ce qui entraine une