| 牛香豫, 唐国平, 顾慧, 陈桃, 陈晓桦.流溪河水库流域碳氮营养盐浓度的时空变化特征及其影响因素[J].水土保持学报,2022,36(2):352~360 |
| 流溪河水库流域碳氮营养盐浓度的时空变化特征及其影响因素 |
| Spatial-temporal Variation of Carbon and Nitrogen Nutrients Concentrations and Its Influencing Factors in Liuxi River Reservoir Basin |
| 投稿时间：2021-08-27 |
| DOI：10.13870/j.cnki.stbcxb.2022.02.045 |
| 中文关键词: 碳氮营养物 弹性网络回归 人类活动 土地利用 生物地球化学循环 |
| 英文关键词: carbon and nitrogen nutrients Elastic Net regression human activities land use biogeochemical cycles |
| 基金项目:国家自然科学基金项目（42171025） |
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| 中文摘要: |
| 流溪河水库流域是亚热带典型的山地河源区,研究此流域的碳氮营养盐浓度时空变化特征及其影响因素对揭示亚热带流域生物地球化学循环与保障水资源供给具有重要意义。基于地形、气象、土地利用、土壤和实地采样获得的水质数据,采用相关分析及Elastic Net回归分析法,探讨了流溪河水库流域溪流碳氮营养盐浓度的时空变化特征及其影响因素。结果表明:(1)从时间上看,枯水期各采样点溪流碳氮营养盐浓度总体变化不大,但空间差异明显,其中NO3-与NH4+浓度具有强相关性。(2)流域坡度大小是引起不同溪流碳氮营养盐浓度存在差异的重要因子,且三级以上坡度对碳氮营养盐浓度变化产生显著的正面影响。(3)流域平均相对湿度也显著影响溪流碳氮营养盐的浓度。流域相对湿度越大,溪流的溶解有机碳浓度相对较高,但氮营养物浓度相对较低;同DOC相比,NO3-和NH4+对气象条件变化敏感度较低。(4)土地利用如建成区面积占比等人类活动显著影响碳氮营养盐的浓度,表现为建成区面积占比与DOC浓度呈负相关关系。此外,森林覆盖度增大会提高溪流DOC和NO3-的浓度,但对NH4+浓度的影响不显著。(5)土壤类型也影响流域碳氮营养盐的浓度,简育低活性强酸土对NO3-浓度产生正面影响,人为堆积土对NH4+浓度产生正面影响。研究结果可为流域水资源保护和了解碳氮营养物浓度的变化及影响因素提供有益信息。 |
| 英文摘要: |
| The Liuxi River reservoir basin is a typical subtropical mountain basin, and it is of great significance to study the changing characteristics of carbon and nitrogen nutrients concentrations in this basin and its influencing factors to reveal the biogeochemical cycle of subtropical basin. Based on the field sampling of water quality, landscape topography, meteorology, land use as well as soil data, this paper explored the spatial-temporal changing characteristics and the influencing factors of the carbon and nitrogen nutrients concentrations in streams located in the Liuxi River Reservoir basin, using correlation and Elastic Net regression analysis. The results showed that:(1) The temporal trend of carbon and nitrogen nutrients concentrations in streams was relatively stable during dry period, whereas the spatial variation was obvious. (2) The slope of sub-basin was an important environmental factor that caused the changes of carbon and nitrogen nutrients concentrations in different streams, and the slope beyond 6° had a significant positive effect on the change of carbon and nitrogen nutrients concentrations. (3) The average relative humidity of the basin also significantly affected the concentrations of carbon and nitrogen nutrients in streams. The greater the relative humidity of the basin was, the higher the concentration of carbon nutrients in the streams would be, but the concentration of nitrogen nutrients would be relatively low. Compared witth the DOC, the NH4+ and NO3- concentrations in streams were less sensitive to the weather conditions. (4) The land use, such as the proportion of the built-up area and other human activities, significantly affected the concentrations of carbon and nitrogen nutrients, as shown by a negative correlation between the built-up area and the DOC concentration. The increased forest cover could enhance the DOC and NO3- concentrations in streams, but had no significant effect on the NH4+ concentration. (5) The different soil types also affected the concentrations of carbon and nitrogen nutrients in watersheds, the haplic acrisols had a positive effect on the NO3- concentration, and the aric anthrosols had a positive effect on the concentration of NH4+. Overall, our results provide some useful scientific information for the protection of water resources and understanding the changes and influencing factors of carbon and nitrogen nutrients concentrations in the similar watersheds. |
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