Effects of mountain tea plantations on nutrient cycling at upstream watersheds

Lin, Teng Chiu; Shaner, Pei Jen L.; Wang, L.-J.; Shih, Yu-Ting; Wang, C.-P.; Guo, Huiqing; Huang, Jr‐Chuan

doi:10.5194/hess-19-4493-2015

Cited by 20 publications

(12 citation statements)

References 47 publications

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“…et al, Lu et al, 2017). However, our results showed that in many cases such models would not perform well during extreme conditions such as during typhoons.…”

Section: Unpredictability Of Hydrochemical Response To Climate Extremescontrasting

confidence: 54%

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Lin¹

2018

Preprint

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“…et al, Lu et al, 2017). However, our results showed that in many cases such models would not perform well during extreme conditions such as during typhoons.…”

Section: Unpredictability Of Hydrochemical Response To Climate Extremescontrasting

confidence: 54%

Authors' responses to RC2's all comments

Lin¹

2018

Preprint

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“…Many hydrological models are constructed primarily based on non-extreme conditions or on a combination of both extreme and non-extreme conditions (Wade et al, 2006; Lu et al, 2017). However, our results showed that in many cases such models would not perform well during extreme conditions such as during typhoons.…”

Section: Unpredictability Of Hydrochemical Response To Climate Extremesmentioning

confidence: 74%

Shifts in stream hydrochemistry in responses to typhoon and non-typhoon precipitation

Chang¹,

Huang²,

Wang³

et al. 2018

Biogeosciences

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Climate change is projected to increase the intensity and frequency of extreme climatic events such as tropical cyclones. However, few studies have examined the responses of hydrochemical processes to climate extremes. To fill this knowledge gap, we compared the relationship between stream discharge and ion input-output budget during typhoon and non-typhoon periods in four subtropical mountain watersheds with different levels of agricultural land cover in northern Taiwan. The results indicated that the high predictability of ion input-output budgets using stream discharge during the non-typhoon period largely disappeared during the typhoon periods. For ions such as Na + , NH + 4 , and PO 3− 4 , the typhoon period and non-typhoon period exhibited opposite discharge-budget relationships. In other cases, the discharge-budget relationship was driven by the typhoon period, which consisted of only 7 % of the total time period. The striking differences in the discharge-ion budget relationship between the two periods likely resulted from differences in the relative contributions of surface runoff, subsurface runoff and groundwater, which had different chemical compositions, to stream discharge between the two periods. Watersheds with a 17-22 % tea plantation cover showed large increases in NO − 3 export with increases in stream discharge. In contrast, watersheds with 93-99 % forest cover showed very mild or no increases in NO − 3 export with increases in discharge and very low levels of NO − 3 export even during typhoon storms. The results suggest that even mild disruption of the natural vegetation could largely alter hydrochemical processes. Our study clearly illustrates significant shifts in hydrochemical responses between regular and typhoon precipitation. We propose that hydrological models should separate hydrochemical processes into regular and extreme conditions to better capture the whole spectrum of hydrochemical responses to a variety of climate conditions.

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“…Higher SRP flux occurred in typhoon storm events with longer antecedent dry days and lower API 5 values. This may explain the re-mobilization of P-rich bed-sediments that accumulated within the river channel from the upstream to the downstream of main inflow river during the summer low-flow periods [46][47][48][49]. Previous work also suggest that channel fine-grained sediment potentially stores phosphorus, ready to be remobilized during storm events [50][51][52].…”

Section: Discussionmentioning

confidence: 89%

Phosphorus Dynamics along River Continuum during Typhoon Storm Events

Fai

Huang

Shiah

2017

Water

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Information on riverine phosphorus (P) dynamics during typhoon storm events remains scarce in subtropical regions. Thus, this study investigates the spatial and temporal dynamics of riverine phosphorus in a headwater catchment during three typhoon events. Continuous sampling (3 h intervals) of stormwater samples and discharge data were conducted at five locations, which represent the upstream, transitional zone, and downstream areas of the main inflow river. The results revealed that the average event mean concentrations (EMCs) for total dissolved phosphorus (TDP) and particulate phosphorus (PP) in the upstream catchment of Fei-Tsui reservoir were 15.66 µg/L and 11.94 µg/L, respectively. There was at least a 1.3-fold increase in flow-weighted concentrations of TDP and PP from the upper to lower reaches of the main stream. PP and TDP were transported either in clockwise or anticlockwise directions, depending on storm intensity and source. The transport of TDP was primarily regulated by the subsurface flow during the storm event. Soluble reactive phosphorus (SRP) contributes more than 50% of the TDP load in moderate storms, while extreme storms supply a greater dissolved organic phosphorus (DOP) load into the stream. TDP accounted for approximately 50% of TP load during typhoon storms. Mobilization of all P forms was observed from upstream to downstream of the river, except for DOP. A decrease of DOP load on passing downstream may reflect the change in phosphorus form along the river continuum. Peak discharge and antecedent dry days are correlated positively with P fluxes, indicating that river bank erosion and re-suspension of within-channel sediment are the dominant pathways of P during typhoon storm periods.

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Effects of mountain tea plantations on nutrient cycling at upstream watersheds

Cited by 20 publications

References 47 publications

Authors' responses to RC2's all comments

Authors' responses to RC2's all comments

Shifts in stream hydrochemistry in responses to typhoon and non-typhoon precipitation

Phosphorus Dynamics along River Continuum during Typhoon Storm Events

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