PDF(Sci-hub)
Abstract：
Land use plays a significant role in determining the spatial patterns of water quality in the Johor River Basin (JRB), Malaysia. In the recent years, there have been several occurrences of pollution in these rivers, which has generated concerns over the long-term sustainability of the water resources in the JRB. Specifically, this water resource is a shared commodity between two states, namely, Johor state of Malaysia and Singapore, a neighbouring country adjacent to Malaysia. Prior to this study, few research on the influence of land use configuration on water quality have been conducted in Johor. In addition, it is also unclear how water quality varies under different seasonality in the presence of point sources. In this study, we investigated the influence of land use and point sources from wastewater treatment plants (WWTPs) on the water quality in the JRB. Two statistical techniques - Multivariate Linear Regression (MLR) and Redundancy Analysis (RA) were undertaken to analyse the relationships between river water quality and land use configuration, as well as point sources from WWTPs under different seasonality. Water samples were collected from 49 sites within the JRB from March to December in 2019. Results showed that influence from WWTPs on water quality was greater during the dry season and less significant during the wet season. In particular, point source was highly positively correlated with ammoniacal‑nitrogen (NH3-N). On the other hand, land use influence was greater than point source influence during the wet season. Residential and urban land use were important predictors for nutrients and organic matter (chemical oxygen demand); and forest land use were important sinks for heavy metals but a significant source of manganese.
摘要：
土地利用在确定柔佛河流域（JRB）的水质空间格局中起着重要作用，马来西亚。近年来,这些河流中发生了几次污染，这引起了人们对JRB水资源长期可持续性的担忧。具体来说,这种水资源是两国共享的商品，即,马来西亚柔佛州和新加坡，与马来西亚相邻的邻国。在这项研究之前，在柔佛州，关于土地利用配置对水质影响的研究很少。此外,还不清楚在存在点源的情况下，水质在不同季节性下如何变化。在这项研究中,我们调查了土地利用和污水处理厂（WWTP）点源对JRB水质的影响。进行了两种统计技术-多元线性回归（MLR）和冗余分析（RA）来分析河流水质与土地利用配置之间的关系，以及不同季节下污水处理厂的点源。2019年3月至12月，从JRB内的49个地点收集了水样。结果表明，污水处理厂对水质的影响在旱季较大，而在雨季则较小。特别是,点源与氨氮（NH3-N）高度正相关。另一方面,雨季土地利用影响大于点源影响。住宅和城市土地利用是养分和有机物（化学需氧量）的重要预测因子；林地是重金属的重要汇，但锰的重要来源。
