Hydrological pathway and source area of nutrient losses identified by a multi-scale monitoring in an agricultural catchment

Tang, Jialiang; Zhang, Bin; Gao, Chao; Zepp, Harald

doi:10.1016/j.catena.2007.07.004

Cited by 73 publications

(52 citation statements)

References 32 publications

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“…For southern Chinese watersheds especially, we also recommend a high frequency of monitoring of flow and nutrients in tributaries during the pronounced wet season (for Kaiping: June to August, Fig. 3) to allow better model calibration and validation of peak events that potentially transport a considerable proportion of the total nutrient export (Tang et al 2008). Moreover, a denser rainfall gauge network should be considered in order to capture spatial heterogeneities in precipitation.…”

Section: Lessons Learnt and The Way Forwardmentioning

confidence: 99%

Assessing ways to combat eutrophication in a Chinese drinking water reservoir using SWAT

Nielsen

Trolle

et al. 2013

Mar. Freshwater Res.

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Abstract. Across China, nutrient losses associated with agricultural production and domestic sewage have triggered eutrophication, and local managers are challenged to comply with drinking water quality requirements. Evidently, the improvement of water quality should be targeted holistically and encompass both point sources and surface activities within the watershed of a reservoir. We expanded the ordinary Soil Water Assessment Tool -(SWAT) with a widely used empirical equation to estimate total phosphorus (TP) concentrations in lakes and reservoirs. Subsequently, we examined the effects of changes in land and livestock management and sewage treatment on nutrient export and derived consequences for water quality in the Chinese subtropical Kaiping (Dashahe) drinking water reservoir (supplying 0.4 million people). The critical load of TP was estimated to 13.5 tonnes yr À1 in order to comply with the minimum drinking water requirements, which corresponds to 87% of the simulated load to the reservoir at present. Both the implementation of buffer zones along rivers and removal of sewage discharges showed marked improvement in reservoir water quality. Future research should focus on both hydrological model performance and nutrient transport pathways, which are challenged by a complex artificially altered water infrastructure in the form of ditches, channels and ponds in monsooninfluenced subtropical watersheds.

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Section: Lessons Learnt and The Way Forwardmentioning

confidence: 99%

Assessing ways to combat eutrophication in a Chinese drinking water reservoir using SWAT

Nielsen

Trolle

et al. 2013

Mar. Freshwater Res.

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“…Potential evaporation exceeds rainfall from late July to November, causing seasonal drought. Stream flow discharges in the catchment consequently exhibit strong seasonality, with high base flow during the irrigation period and ephemeral drying-up periods after irrigation stopped since October in the dry season (Tang et al, 2007(Tang et al, , 2008. The geology in the region consists of weakly weathered Cretaceous sandstone underlying deeply weathered Quaternary red clay, resulting in the formation of lateritic profiles on the hills: surficial clayey, sandy or their mixture deposits, ferruginized caprock and mottled zone, overlying weakly weathered sandstone.…”

Section: Study Site and Catchmentmentioning

confidence: 99%

“…Zhang et al: Subsurface lateral flow from hillslope and its contribution to nitrate loading in streams blamed for the negative impacts on human and ecosystem health (Wu et al, 1999). Since most of nutrient losses occur during rainfall events, especially in subtropical or tropical area (Kwong et al, 2002;Tang et al, 2008), overland flow is generally considered as the most important hydrological pathway from agricultural lands (Edwards and Owens, 1991;Zhu and Chen, 2002). Overland flow during several rainstorms can deliver more than half (Lowrance et al, 1984;Edwards and Owens, 1991) or even 90 % (Nash and Halliwell, 1999) of total annual losses of soils and nutrients in agricultural catchment.…”

Section: Introductionmentioning

confidence: 99%

Subsurface lateral flow from hillslope and its contribution to nitrate loading in streams through an agricultural catchment during subtropical rainstorm events

Zhang

Tang

Gao

et al. 2011

Hydrol. Earth Syst. Sci.

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Abstract. Subsurface lateral flow from agricultural hillslopes is often overlooked compared with overland flow and tile drain flow, partly due to the difficulties in monitoring and quantifying. The objectives of this study were to examine how subsurface lateral flow generated through soil pedons from cropped hillslopes and to quantify its contribution to nitrate loading in the streams through an agricultural catchment in the subtropical region of China. Profiles of soil water potential along hillslopes and stream hydro-chemographs in a trenched stream below a cropped hillslope and at the catchment outlet were simultaneously recorded during two rainstorm events. The dynamics of soil water potential showed positive matrix soil water potential over impermeable soil layer at 0.6 to 1.50 m depths during and after the storms, indicating soil water saturation and drainage processes along the hillslopes irrespective of land uses. The hydro-chemographs in the streams, one trenched below a cropped hillslope and one at the catchment outlet, showed that the concentrations of particulate nitrogen and phosphorus corresponded well to stream flow during the storm, while the nitrate concentration increased on the recession limbs of the hydrographs after the end of the storm. All the synchronous data revealed that nitrate was delivered from the cropped hillslope through subsurface lateral flow to the streams during and after the end of the rainstorms. A chemical mixing model based onCorrespondence to: B. Zhang (bzhang@caas.ac.cn) electricity conductivity (EC) and H + concentration was successfully established, particularly for the trenched stream. The results showed that the subsurface lateral flow accounted for 29 % to 45 % of total stream flow in the trenched stream, responsible for 86 % of total NO − 3 -N loss (or 26 % of total N loss), and for 5.7 % to 7.3 % of total stream flow at the catchment outlet, responsible for about 69 % of total NO − 3 -N loss (or 28 % of total N loss). The results suggest that subsurface lateral flow through hydraulically stratified soil pedons have to be paid more attention for controlling non-point source surface water pollution from intensive agricultural catchment particularly in the subtropical areas with great soil infiltration.

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“…최근 들어 농업생산 환경의 중요성이 부각되면서 토양 미생물의 기능과 집적된 양 분이 환경으로 유출될 수 있는 가능성을 평가하고 2차 오염을 방지하는 것이 중요하게 되었다 Tang et al, 2008). 건전한 토양은 경작지 내 미생물 군집의 다양성과 관련 되어 있으며 미생물의 밀도, 생물량, 효소활성 등과 밀접한 관 계가 있고 (Cheng, 1990;Lee et al, 2011), 토양 내 원활한 물질 순환이 진행되고, 이 과정 모두 토양미생물이 관여하고 있다 (Munnecke et al,.…”

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Effect of Green Manure Crops Incorporation for Reduction of Pythium zingiberum in Ginger Continuous Cultivation

Jung¹,

Nou²,

Kim³

et al. 2015

Korean Journal of Plant Resources

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-This experiment was carried out to evaluate the effects of green manure crops on the changes of chemical properties and microorganisms in soil of continuous ginger cultivation. The biomass and nitrogen absorption of green manure crop were the highest in crimson clover. After cropping, soil phosphate content was the lowest in orchard grass, however, T-N content was the highest of hairy vetch > crimson clover > orchard grass. Also real-time PCR analysis was conducted to measure density of Pythium zingiberum in soil of before and after incorporation of green manure crop. Density of P. zingiberum was the lowest of all the green manures. In this results are summarized that green manure cropping reduced salt accumulation and density of P. zingiberum in continuous ginger cultivation. Key words -

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Hydrological pathway and source area of nutrient losses identified by a multi-scale monitoring in an agricultural catchment

Cited by 73 publications

References 32 publications

Assessing ways to combat eutrophication in a Chinese drinking water reservoir using SWAT

Assessing ways to combat eutrophication in a Chinese drinking water reservoir using SWAT

Subsurface lateral flow from hillslope and its contribution to nitrate loading in streams through an agricultural catchment during subtropical rainstorm events

Effect of Green Manure Crops Incorporation for Reduction of Pythium zingiberum in Ginger Continuous Cultivation

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