scholarly journals Publisher Correction: Catchment landscape components alter relationships between discharge and stream water nutrient ratios in the Xitiao River Basin China

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Changjun Gao ◽  
Wei Li ◽  
Lijuan Cui ◽  
Qiongfang Ma ◽  
Jian Cai
Keyword(s):  
River Basin ◽  
Stream Water ◽  
Nutrient Ratios

scholarly journals Catchment landscape components alter relationships between discharge and stream water nutrient ratios in the Xitiao River Basin China

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Changjun Gao ◽  
Wei Li ◽  
Lijuan Cui ◽  
Qiongfang Ma ◽  
Jian Cai
Keyword(s):  
River Basin ◽  
Urban Areas ◽  
Stream Water ◽  
Hydrological Regime ◽  
Low Flow ◽  
Nutrient Ratios ◽  
Terrestrial Environment ◽  
Discharge Data ◽  
Stream Discharge ◽  
C:P Ratios

AbstractThe terrestrial environment of a watershed is a source of potential carbon (C), nitrogen (N), and phosphorus (P) exports, and the hydrological regime provides the mechanism to turn the potential exports into reality when water is available. However, the extent to which the terrestrial environment alters the strength and nature of streamflow in transporting stream water nutrient ratios remains largely unknown. This study combined monthly stream discharge data with synchronously sampled stream water C:N:P ratios in 14 catchment streams in the Xitiao River Basin (XRB) in Zhejiang Province, China. The transport effect of streamflow on C:N:P ratios varied depending on the nutrient element, flow condition, and terrestrial environment. In the lower reaches of the XRB, there were negative relationships between C:N ratios, C:P ratios and watershed discharge, and positive relationships between N:P ratios and watershed discharge in both high and low flow conditions. In the middle and upper reaches of the XRB, the C:N-discharge relationship changed from negative to positive when the streamflow conditions altered from low to high flow. The C:P- and N:P-discharge relationships were negative regardless of high or low flows, but the regression coefficient significantly decreased with increasing streamflow. The C:N-discharge correlation over the course of the year shifted from negative to positive, as urban areas expanded within the catchment. The C:P-discharge relationship altered from negative to positive with more cropland and wetland but from positive to negative with a greater forest percentage and mean percentage slope. Our results indicate that changes in the terrestrial environment (e.g., the proportion of a particular land cover within a watershed) generally produced a threshold flow above which the coupling relationships between element fluxes from the terrestrial to riverine ecosystem changed sharply.

Using natural strontium isotopic signatures as fish markers: methodology and application

2000 ◽  
Vol 57 (11) ◽  
pp. 2280-2292 ◽  
Author(s):  
Brian P Kennedy ◽  
Joel D Blum ◽  
Carol L Folt ◽  
Keith H Nislow
Keyword(s):  
River Basin ◽  
Stream Water ◽  
Spatial Scales ◽  
Fish Tissue ◽  
Isotopic Signature ◽  
Food Sources ◽  
Sr Isotopes ◽  
Connecticut River ◽  
Isotopic Signatures ◽  
Calcified Tissues

To distinguish Atlantic salmon (Salmo salar) populations in tributaries of the Connecticut River, we studied the incorporation and stability of Sr isotopes in juvenile salmon. We established the geologic basis for unique isotopic signatures in 29 salmon sites. Stream-specific Sr isotopic ratios (87Sr/86Sr) were found in calcified tissues of salmon parr within 3 months of stocking. We found little seasonal variation in the Sr signatures of stream water or fish tissue. There were no significant differences among the Sr signatures of otoliths, scales, and vertebrae. For mature salmon raised under constant conditions, 70% of the Sr isotopic signature in calcified tissues was derived from food sources. We developed a criterion for identifying moving fish based upon the isotopic variability of genetically marked fish. Applying this criterion to our streams, 7% of the fish in our study had incorporated Sr from multiple streams. Strontium isotopes distinguished all 8 regions in the White River basin and 7 of the 10 regions in the West River basin. When watersheds are considered together, Sr isotopes differentiated 11 unique signatures from 18 regions. We conclude that Sr isotopes are an effective marking tool and discuss ways in which they can be combined with other marking techniques over larger spatial scales.

scholarly journals Nitrogen and Oxygen Isotope Composition of Nitrate in Stream Water of Fuji River Basin

2011 ◽  
Vol 41 (3) ◽  
pp. 79-89 ◽  
Author(s):  
Takashi NAKAMURA ◽  
Ken-ichi OSAKA ◽  
Yuki HIRAGA ◽  
Futaba KAZAMA
Keyword(s):  
Oxygen Isotope ◽  
River Basin ◽  
Isotope Composition ◽  
Stream Water ◽  
Oxygen Isotope Composition

scholarly journals Eco-hydrological effects of stream-aquifer water interaction: A case study of the Heihe River Basin, northwestern China

2016 ◽  
Author(s):  
Yujin Zeng ◽  
Zhenghui Xie ◽  
Yan Yu ◽  
Shuang Liu ◽  
Linying Wang ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Water Level ◽  
River Water ◽  
River Basin ◽  
Water Table ◽  
Riparian Vegetation ◽  
Stream Water ◽  
Growing Season ◽  
Heihe River Basin ◽  
Heihe River

Abstract. A scheme describing the process of stream-aquifer interaction was incorporated into the land model CLM4.5 to investigate the effects of stream water conveyance over riparian banks on ecological and hydrological processes. Two groups of simulations for five typical river cross-sections in the middle reaches of the arid zone Heihe River Basin were conducted. The simulated riparian ground water table at a propagation distance of less than 1 km followed the intra-annual flu ctuation of the river water level, and the correlation was excellent (R2 = 0.9) between the river water level and the groundwater table at the distance 60 m from the river. The correlation rapidly decreased as distance increased. In response to the variability of the water table, soil moisture at deep layers also followed the variation of river water level all year, while soil moisture at the surface layer was more sensitive to the river water level in the drought season than in the wet season. With increased soil moisture, the average gross primary productivity and respiration of riparian vegetation within 300 m from the river at a typical section of the river increased by approximately 0.03 mg C m−2 s−1 and 0.02 mg C m −2 s−1, respectively, in the growing season. Consequently, the net ecosystem exchange increased by approximately 0.01 mg C m−2 s−1, and the evapotranspiration increased by approximately 3 mm d−1. Furthermore, the length of the growing season of riparian vegetation also increased by 2–3 months due to the sustaining water recharge from the river.

scholarly journals Differences in Stream Water Nitrate Concentrations between a Nitrogen-Saturated Upland Forest and a Downstream Mixed Land Use River Basin

Hydrology ◽  
2017 ◽  
Vol 4 (3) ◽  
pp. 43 ◽  
Author(s):  
Ken’ichi Shinozuka ◽  
Masaaki Chiwa ◽  
Ichiro Tayasu ◽  
Chikage Yoshimizu ◽  
Kyoichi Otsuki ◽  
...  
Keyword(s):  
Land Use ◽  
River Basin ◽  
Stream Water ◽  
Upland Forest ◽  
Nitrate Concentrations ◽  
Mixed Land Use

scholarly journals Detecting the long-term impacts from climate variability and increasing water consumption on runoff in the Krishna river basin (India)

2006 ◽  
Vol 3 (4) ◽  
pp. 1249-1280 ◽  
Author(s):  
L. M. Bouwer ◽  
J. C. J. H. Aerts ◽  
P. Droogers ◽  
A. J. Dolman
Keyword(s):  
Climate Variability ◽  
River Basin ◽  
Water Consumption ◽  
Stream Water ◽  
Central India ◽  
Annual Runoff ◽  
Balance Model ◽  
Basin Scale ◽  
Runoff Variability ◽  
Increasing Demand

Abstract. Variations in climate, land-use and water consumption can have profound effects on river runoff. There is an increasing demand to study these factors at the regional to river basin-scale since these effects will particularly affect water resources management at this level. This paper presents a method that can help to differentiate between the effects of man-made hydrological developments and climate variability at the basin scale. We show and explain the relation between climate, water consumption and changes in runoff for the Krishna river basin in central India. Runoff under climate variability and increasing water consumption for irrigation and hydropower is simulated for the last 100 years using the STREAM water balance model. Runoff under climate variability is shown to vary only by about 14–34 mm (6–15%). It appears that reservoir construction after 1960 and increasing water consumption has caused a persistent decrease in annual runoff of up to approximately 123 mm (61%). Variation in runoff under natural climate variability only would have decreased over the period under study, but we estimate that increasing water consumption causes about two thirds of the current runoff variability.

Spatial variation of stream water chemistry in the Shimanto River Basin in southwestern Japan: A comparison of results in 1999 and 2020

2021 ◽  
Author(s):  
Yoshiyuki Inagaki ◽  
Masahiro Inagaki ◽  
Koji Shichi ◽  
Shuichiro Yoshinaga ◽  
Tsuyoshi Yamada ◽  
...  
Keyword(s):  
Nutrient Cycling ◽  
Water Chemistry ◽  
River Basin ◽  
Forest Ecosystems ◽  
Stream Water ◽  
Mean Annual Temperature ◽  
Sulfate Concentration ◽  
Stream Water Chemistry ◽  
The Mean ◽  
Mean Concentration

<p>Acidic deposition derived from human activities causes negative effects on nutrient cycling in forest ecosystems.  However, nutrient cycling of forest ecosystems is expected to recover because the emission of pollutants is generally decreasing in recent years.  However, the extent of recovery would be differed between forest ecosystems in different climatic conditions.  The study investigated changes of stream water chemistry of forest ecosystems in Shimanto River Basin in southwestern Japan.  The 92 samples of stream water were collected from forested watersheds in summer of 1999 and 2020 and chemistry of the samples was compared.  The mean pH value of the stream water in 2020 (7.60) was higher than that in 1999 (7.29).  The mean concentration of potassium ion increased by 2.1% whereas that of sodium, calcium, and magnesium ions decreased by 2.5%, 10.3%, and 8.6%, respectively.  The mean concentration of chloride, nitrate and sulfate ions decreased by 24.8%, 9.4% and 22.5%, respectively whereas that of bicarbonate increased by 0.7%. 　The relationship between mean annual temperature and the ratio of ion concentration in 2020 to that in 1999 was analyzed.  The ratio of calcium and manganese concentration was lower at warmer sites.  The ratio of sulfate concentration was lower at warmer sites whereas the ratio of chloride concentration was not related with mean annual temperature.  The results suggest that the runoff of sulfate and chloride from forest ecosystems in the Shimanto River Basin have decreased presumably due to the reduced input of these elements and that the residence time of sulfur in forest ecosystems is shorter in warmer sites as indicated by the greater reduction of sulfate concentration.</p><p> </p>

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