期刊名称：Journal of Geoscience and Environment Protection
印刷版ISSN：2327-4336
电子版ISSN：2327-4344
出版年度：2019
卷号：7
期号：7
页码：92-107
DOI：10.4236/gep.2019.77008
语种：English
出版社：Scientific Research Pub
摘要：An investigation into the relationship between temperature and the nutrients (,, and ) in pelagial primary productivity of the middle reaches of Otamiri River in Owerri, Southeastern Nigeria was carried out between October and November, 2018 at ten sampling points (OTP 1-OTP 10). The estimation of productivity was made with the light and dark bottle technique. Maximum yields in Gross Primary Productivity (GPP) (0.8738 mgCL-1d-1), Net Primary Productivity (NPP) (0.8513 mgCL-1d-1), as well as Community Respiration (CR) (0.1613 mgCL-1d-1) were recorded at OTP 3, OTP 3 and OTP 8 respectively that had more vegetation covers than in segments without cover. GPP is correlated withions (r = 0.400),ions (r = 0.418), and water temperature (r = 0.379) (p < 0.05), while CR is correlated with ions (r = 0.500) (p < 0.01). The variability of GPP increased mildly with increasing temperature and the nutrients; with predicted regression model productivities of 0.1388, 0.5621, and 0.6066 mgCL-1d-1, corresponding with mean values of 28.41℃, 0.33 mg/L, 1.04 mg/L and 10.25 mg/L recorded for temperature,,, and ions concentrations. Mean GPP was estimated to result in a comparatively low annual productivity of 188.75 mgCL-1yr-1. Conservation and restoration of riparian vegetation covers in watershed corridors of the river for optimal driver roles were recommended.
关键词：EutrophicationRiparian vegetationPrimary productivityNutrientsOtamiri River
