三岔河干流水质相关性及时空变化特征研究
Correlation and spatio-temporal variation characteristics of water quality in the main stream of Sancha River
谢旭姣 1王海鹤 2孙媛媛 3张帅 1王济1
作者信息
- 1. 贵州师范大学 地理与环境科学学院,贵州 贵阳 550025;贵州省喀斯特山地生态环境国家重点实验室培育基地,贵州 贵阳 550025
- 2. 贵州省生态环境监测中心,贵州 贵阳 550081
- 3. 国家林业局西南喀斯特山地生物多样性保护重点实验室,贵州 贵阳 550025;贵州师范大学 生命科学学院,贵州 贵阳 550025
- 折叠
摘要
三岔河是乌江的源头,为充分了解三岔河流域水质状况,更好的保护源头水,研究了2022 年三岔河干流水质时空变化特征及DO、pH、NH3-N、TN、CODCr、BOD5、CODMn和TP等8 项监测指标之间的相关性.结果表明:1)三岔河干流全年水质均保持在Ⅲ类及以上类别(TN不参与评价),水体水质良好,水体全年呈现弱碱性,DO含量较高,外源污染主要为沿河两岸农业面源和周边居民生活污水排放.2)空间变化趋势:CODCr、CODMn和BOD5 3 个监测指标空间变异系数均在0.3～0.5 之间,空间变化不明显,三者之间存在显著的正相关,空间变化特征均为中游>下游>上游;NH3-N与TP的空间变异系数均超过 0.9,二者均存在显著的空间分布差异,二者之间存在极显著正相关,变化特征均为中游>上游>下游;TN与其余指标均不存在显著相关性,TN呈现下游>中游>上游的空间变化特征.3)时间变化趋势:2022 年三岔河TN呈现 7 月>10 月>1 月>4 月的时间变化特征,TN浓度主要受人为活动的影响;NH3-N、TP、CODCr、BOD5、CODMn等指标无明显时间变化特征.
Abstract
Sancha River is the source of Wujiang River.In order to fully understand the water quality of Sancha River basin,and better protect the source water,the spatio-temporal variation characteristics of water quality in the main stream of Sancha River in 2022 and the correlation between monitoring in-dicators were studied.The analysis indicators included 8 items in total:DO,pH,NH3-N,TN,CODCr,BOD5,CODMn and TP.The results showed that 1)The water quality remained in class Ⅲ or above all the year round(TN did not participate in the evaluation),and the water quality was excellent.The wa-ter body showed weak alkalinity and high DO content throughout the year.The external pollution was mainly from agricultural non-point sources along the river and the surrounding residential sewage dis-charge.2)The spatial variation coefficients of CODCr,CODMn and BOD5 were between0.3～0.5,with a significant positive correlation among the three indicators.The spatial variation characteristics were mid-stream>downstream>upstream.The spatial variation coefficients of NH3-N and TP are both more than 0.9,and there was a significant spatial distribution difference between them.There was a very signifi-cant positive correlation between them,and the variation characteristics were midstream>upstream>downstream.There was no significant correlation between TN and other indexes,and TN showed the spatial variation characteristics of downstream>midstream>upstream.3)In 2022,TN of Sanchahe Riv-er show the temporal variation characteristics of July>October>January>April,and the concentration of TN is mainly affected by human activities.Other indexes had no obvious time change characteristics.
关键词
三岔河/水质空间变化/水质时间变化/相关性Key words
Sancha River/spatial variation of water quality/temporal variation of water quality/corre-lation引用本文复制引用
基金项目
贵州省科技厅支撑计划项目(黔科合支撑[2020]4Y032号)
贵州省科技项目(黔科合平台人才[2017]5726-26)
贵阳市科技计划项目(筑科合同[2019]2-8号)
贵州师范大学学术新苗基金项目(黔师新苗[2022]B32号)
出版年
2024
NETL
NSTL
万方数据