Catchment soil characteristics predict organic carbon, nitrogen, and phosphorus levels in temperate lakes

IF 1.7 4区 环境科学与生态学 Q3 ECOLOGY Freshwater Science Pub Date : 2021-11-05 DOI:10.1086/717954
Margot Sepp, T. Kõiv, P. Nõges, T. Nõges, Silvia E. Newell, M. J. McCarthy
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引用次数: 2

Abstract

Allochthonous supply of dissolved organic matter (DOM) and nutrients from the catchment have a substantial impact on the physical and chemical properties of lake water. Transport of DOM and nutrients is affected by different catchment characteristics, e.g., catchment area, soil and land cover, and population density. The aim of this study was to relate geological, hydrological, land-cover, and soil characteristics of 52 temperate catchments in Estonia to variability in DOM (measured as dissolved organic carbon [DOC]), total organic nitrogen (TON), and total phosphorus (TP) in lakes and to assess the relative importance of different land-cover and soil types as sources of these substances. DOC, TON, and TP were very diverse in the studied lakes. Strong positive correlation between DOC and TON indicated that these substances had similar concentration patterns and sources. Catchment soil cover was the best predictor of DOC, TON, and TP levels in lakes, explaining up to 43.8% of their variabilities. This observation can partly be explained by different soil organic carbon (SOC) content: soils with higher SOC were associated with higher lake DOC and TON, whereas soils with low SOC corresponded to lower DOC and TON. Similar to other temperate lakes, bogs and peat soils were a major source of DOM in our studied lakes. DOC, TON, and color were positively associated with percentages of peat soils in the catchment. On the other hand, TP increased with the proportion of urban areas in the catchments, indicating the importance of human impact on its concentration. Understanding the impact of different catchment characteristics on DOC, TON, and TP in temperate lakes is crucial for developing transport models used for predicting future levels of DOM and nutrients under changing climate and land use.
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集水区土壤特征预测温带湖泊的有机碳、氮和磷水平
集水区溶解有机物(DOM)和营养物质的非正常供应对湖水的物理和化学性质产生了重大影响。DOM和营养物质的运输受到不同集水区特征的影响,例如集水区面积、土壤和土地覆盖以及人口密度。本研究的目的是将爱沙尼亚52个温带集水区的地质、水文、土地覆盖和土壤特征与湖泊中DOM(以溶解有机碳[DOC]测量)、总有机氮(TON)和总磷(TP)的变化联系起来,并评估不同土地覆盖和土壤类型作为这些物质来源的相对重要性。DOC、TON和TP在所研究的湖泊中非常多样化。DOC和TON之间具有很强的正相关关系,表明这些物质具有相似的浓度模式和来源。集水区土壤覆盖是湖泊DOC、TON和TP水平的最佳预测因子,解释了高达43.8%的变化。这一观察结果可以部分解释为不同的土壤有机碳含量:SOC较高的土壤与较高的湖泊DOC和TON相关,而SOC较低的土壤与较低的DOC和TON。与其他温带湖泊类似,沼泽和泥炭土是我们研究的湖泊中DOM的主要来源。DOC、TON和颜色与集水区泥炭土的百分比呈正相关。另一方面,TP随着城市地区在集水区中的比例而增加,表明人类影响对其浓度的重要性。了解不同集水区特征对温带湖泊DOC、TON和TP的影响,对于开发用于预测气候和土地利用变化下未来DOM和养分水平的运输模型至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Freshwater Science
Freshwater Science ECOLOGY-MARINE & FRESHWATER BIOLOGY
CiteScore
4.10
自引率
0.00%
发文量
49
审稿时长
6-12 weeks
期刊介绍: Freshwater Science (FWS) publishes articles that advance understanding and environmental stewardship of all types of inland aquatic ecosystems (lakes, rivers, streams, reservoirs, subterranean, and estuaries) and ecosystems at the interface between aquatic and terrestrial habitats (wetlands, riparian areas, and floodplains). The journal regularly features papers on a wide range of topics, including physical, chemical, and biological properties of lentic and lotic habitats; ecosystem processes; structure and dynamics of populations, communities, and ecosystems; ecology, systematics, and genetics of freshwater organisms, from bacteria to vertebrates; linkages between freshwater and other ecosystems and between freshwater ecology and other aquatic sciences; bioassessment, conservation, and restoration; environmental management; and new or novel methods for basic or applied research.
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