内蒙古河套永济灌域渠道底泥有机质和总氮含量特征

发布时间：2018-06-14 14:46

本文选题：永济灌域 + 底泥　；参考：《中国沙漠》2016年01期

【摘要】：排灌系统底泥特征是反映土地利用变化生态影响的重要途径,为此对内蒙古河套灌区永济灌域灌排系统底泥有机碳和总氮含量进行了系统研究。结果表明:灌域内永济给水干渠(简称永济干渠)与四号、五号排水干沟(简称四排干、五排干)表层底泥的有机质(OM)及总氮(TN)含量特征分布有所差异。其中均以五排干上游底泥中含量最高,OM与TN平均值分别为3.60%和0.35%,超出河套地区平均值的4.82倍和2.94倍;其底泥有机指数也达到重污染水平,富营养化程度较高;永济干渠底泥OM与TN含量最低,分别为1.41%和0.03%,属于清洁贫营养化级别;四排干底泥OM与TN含量介于五排干和永济干渠之间,其上游较为清洁,基本接近平均值,C/N平均在17左右。排干底泥有机质与总氮含量之间显著相关,y(TN)=0.141x(OM)-0.180(r=0.978;P0.001)。
[Abstract]:The sediment characteristics of drainage and irrigation system is an important way to reflect the ecological impact of land use change. The organic carbon and total nitrogen content of sediment in Yongji irrigation and drainage system in Hetao irrigation area of Inner Mongolia are studied systematically. The results show that the distribution of organic matter (OM) and total nitrogen (TNN) content in surface mud of Yongji main canal and No. 4 drainage trunk ditch and No. 5 drainage ditch are different in irrigated area. The highest contents of OM and TN were 3.60% and 0.35%, respectively, which were 4.82 times and 2.94 times of the average in Hetao area, and the organic index of sediment reached the level of heavy pollution and the degree of eutrophication was higher. The contents of OM and TN in the bottom mud of Yongji trunk canal are the lowest (1.41% and 0.03%, respectively), which belong to the level of clean and poor nutrition, and the contents of OM and TN in the four rows of dry sediment are between the fifth row and Yongji main canal, and the upper reaches are relatively clean, almost close to the average value of C / N is about 17 or so. There was a significant correlation between organic matter and total nitrogen content in draining sediment.
【作者单位】：中国科学院寒区旱区环境与工程研究所;
【基金】：国家科技支撑计划项目(2011BAC07B02) 国家自然科学基金项目(40901049)
【分类号】：S277;S153.6

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