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Effects of changing land use on dissolved organic matter in a subtropical river watershed, southeast China

机译：东南亚热带河流流域土地利用变化对溶解有机物的影响

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摘要

The composition of dissolved organic matter (DOM) is an important determinant for its biogeochemical role in the aquatic environments. Therefore, it is crucial to determine the effects of changing land use on the DOM composition in the river watershed. Water samples were collected from the outlets of 15 sub-watersheds in the subtropical Jiulong River (southeast China) for fluorescence measurements and parallel factor analysis. Two humic-like (Cl and C2) and one protein-like (C3) fluorescent components were identified. Overall, DOM in the Jiulong River watershed was dominated by humic-like materials, probably due to the fact that 69% of the watershed is covered with forest. The 15 sub-watersheds were grouped into four clusters based on the proportion of each fluorescent component in the total fluorescence, suggesting that the DOM composition could be very different among sub-watersheds. There was a strong negative correlation between C2 and C3%. Cl% correlated with the water body fraction, likely associated with the aquatic production of Cl. C3% correlated positively with the residential area fraction, likely indicating the influence of anthropogenic activities. These results are useful for assessing the effects of land use/land cover changes on the composition and hence biogeochemical roles of DOM in aquatic environments.
机译：溶解有机物（DOM）的组成是其在水生环境中生物地球化学作用的重要决定因素。因此，确定改变土地用途对河流流域DOM组成的影响至关重要。从亚热带的九龙江（中国东南部）的15个小流域的出口收集水样，以进行荧光测量和平行因子分析。鉴定出两种腐殖质样（C1和C2）和一种蛋白质样（C3）荧光组分。总体而言，九龙江流域的DOM主要是腐殖质类物质，这可能是因为69％的流域被森林覆盖。根据每个荧光成分在总荧光中的比例，将15个子集水区分为四个簇，这表明子集水区中的DOM组成可能有很大差异。 C2和C3％之间存在很强的负相关性。 Cl％与水体分数相关，可能与Cl的水生产量有关。 C3％与居住面积比例呈正相关，这可能表明人为活动的影响。这些结果可用于评估土地利用/土地覆盖变化对水生环境中DOM的组成及其生物地球化学作用的影响。

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  • 来源
    《Regional Environmental Change》 |2012年第1期|p.145-151|共7页
  • 作者

    Liyang Yang; Huasheng Hong; Weidong Guo; Jinliang Huang; Qingsheng Li; Xiangxiang Yu;

  • 作者单位

    State Key Laboratory of Marine Environmental Science, College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, People's Republic of China;

    State Key Laboratory of Marine Environmental Science, College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, People's Republic of China;

    State Key Laboratory of Marine Environmental Science, College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, People's Republic of China;

    State Key Laboratory of Marine Environmental Science, College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, People's Republic of China;

    State Key Laboratory of Marine Environmental Science, College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, People's Republic of China;

    State Key Laboratory of Marine Environmental Science, College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    dissolved organic matter; fluorescence; PARAFAC; land use/land cover; Jiulong river; China;

    机译：溶解的有机物荧光PARAFAC;土地利用/土地覆盖;九龙河;中国;

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