| 吴红宝,秦晓波,吕成文,李玉娥,廖育林,万运帆,高清竹,李勇.脱甲河流域水体溶解有机碳时空分布特征[J].农业环境科学学报,2016,35(10):1968-1976. |
| 脱甲河流域水体溶解有机碳时空分布特征 |
| Spatial and temporal distribution of dissolved organic carbon in Tuojia River watershed |
| 投稿时间：2016-04-12 |
| DOI：10.11654/jaes.2016-0495 |
| 中文关键词: 溶解性有机碳 时空分布 环境因子 脱甲河 |
| 英文关键词: dissolved organic carbon spatial and temporal distribution influence factors Tuojia River |
| 基金项目:国家自然科学基金面上项目（41475129）；国家973计划专项（2012CB417106） |
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| 中文摘要: |
| 以亚热带脱甲河农业小流域为研究对象，利用高温催化氧化法和顶空平衡-气相色谱法对脱甲河水系4级河段（S1、S2、S3和S4）溶解有机碳（DOC）浓度与环境因子进行了1年周期（2014年12月至2015年11月）的连续观测，并初步探讨了DOC浓度与环境因子间的相关关系。结果表明：脱甲河DOC浓度范围在0.46~9.54 mg·L-1之间，均值为3.09±0.01 mg·L-1；在季节变化上，DOC浓度表现为夏季 > 春季 > 冬季 > 秋季；在空间分布上各级河段DOC浓度随河流级别的增加逐渐增大，变化范围为（1.36±0.07）~（4.25±0.21）mg·L-1，4级河段间DOC浓度出现了显著差异（P<0.01），表明外源输入可能是不同河段DOC浓度变异的主要原因；DOC浓度与河水溶存二氧化碳（CO2）浓度、盐度、温度、溶解总固体（TDS）及电导率（EC）呈极显著正相关（P<0.01），与溶解氧（DO）呈显著负相关（P<0.05），而与pH值变化无显著关系。研究表明，不同强度的水体理化性质及外源输入是造成DOC浓度差异的主要原因，研究结果可供亚热带其他农业小流域水系DOC浓度时空分布及影响因素研究参考。 |
| 英文摘要: |
| To discover the characteristics of dissolved organic carbon(DOC) in water in small scale agricultural watershed and its relationship with the environment variables, a one-year's continuous survey(from December 2014 to November 2015) was conducted to observe the variation of DOC concentration and environmental factors in 4 different reaches of Tuojia River(S1, S2, S3 and S4) by the Gas Chromatography and high temperature catalytic oxidation method(HTCO). Results showed that the concentration of DOC ranged from 0.46 to 9.54 mg·L-1, with an average value of 3.09 mg·L-1 in the four reaches water of Tuojia River. Moreover, the spatial distribution of DOC concentration increased gradually from 1.36 to 4.25 mg·L-1 with the river levels(from S1 to S4), and the DOC concentration presented the significant differences among 4 reaches(P<0.01), which demonstrates that the exogenous contamination may lead to the variation of DOC concentration in different reaches. Additionally, the DOC has a positive correlation with the dissolved carbon dioxide(CO2) concentration, salinity, temperature, TDS and EC(P<0.01), while DOC concentration showed a negative correlation with the dissolved oxygen(P>0.05). The results of our study indicated that the intensity of different physical and chemical properties of water and exogenous contamination are the main reason for spatial and temporal variation of DOC concentration in Tuojia River. This research may provide important reference for further understanding and research on the source and control of DOC load in small agricultural watershed in subtropical China. |
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