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Hydrogeochemical cycle and storm sol...

Wang, Lih-Jih.

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Hydrogeochemical cycle and storm solute transport in the subtropical Fushan Experimental Forest, NE Taiwan.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Hydrogeochemical cycle and storm solute transport in the subtropical Fushan Experimental Forest, NE Taiwan./
作者:	Wang, Lih-Jih.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1994,
面頁冊數:	144 p.
附註:	Source: Dissertation Abstracts International, Volume: 55-09, Section: B, page: 3663.
Contained By:	Dissertation Abstracts International55-09B.
標題:	Forestry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9504698

Hydrogeochemical cycle and storm solute transport in the subtropical Fushan Experimental Forest, NE Taiwan.
Wang, Lih-Jih.

Hydrogeochemical cycle and storm solute transport in the subtropical Fushan Experimental Forest, NE Taiwan. - Ann Arbor : ProQuest Dissertations & Theses, 1994 - 144 p.

Source: Dissertation Abstracts International, Volume: 55-09, Section: B, page: 3663.

Thesis (Ph.D.)--University of Washington, 1994.

A series of solution collectors was set up and instrumented along flow paths to study the hydrogeochemical cycle and storm solute transport in the subtropical Fushan Experimental Forest in NE Taiwan. Results showed that significant changes in chemistry occurred when rainwater passed through forest and soil to become streamwater. Precipitation chemistry was dominated by Na and Cl, indicating an oceanic origin. When rainwater was intercepted by vegetation and moved downward as stemflow, concentrations of K, Ca, Mg, Cl, SO$\sb4$ and HCO$\sb3$ increased and K, Cl and SO$\sb4$ became dominant species indicating their leaching or washout from foliage and stems. Concentrations of NH$\sb4$ and NO$\sb3$ were decreased probably as a result of direct uptake by vegetation. Throughfall showed a significant increase in almost all cations and anions, including Na, K, Ca, Mg, NH$\sb4$, Cl, PO$\sb4$, SO$\sb4$ and HCO$\sb3$ over that of the rainwater indicating a direct input by canopy leaching and washoff by rainfall. The concentration of NO$\sb3$ decreased slightly. As water flowed through the soil matrix, concentrations increased for most ions relative to rainwater, stemflow and throughfall. Concentrations in the lateral flow from the forest floor, compared to other lateral flows, were higher for most ions, especially for NH$\sb4$, PO$\sb4$ and NO$\sb3$. This indicated that the forest floor might have an important role in providing sources for nutrient transport to the stream in this watershed. Because of active uptake by vegetation and soil microbes, ion concentrations in the soil solution from the rooting zone were the lowest in water collected belowground. When water flowed into deeper soil layers, concentrations of SO$\sb4$ increased dramatically, which also enhanced the leaching of cations like Na, Ca and Mg. Streamwater chemistry was dominated by Ca, Na, Mg, SO$\sb4$ and HCO$\sb3$, showing that the origin of streamwater in this watershed mainly consisted of subsurface flows from deeper soil horizons and streamwater chemistry was also partially controlled by in-stream processes.Subjects--Topical Terms:

895157
Forestry.

Hydrogeochemical cycle and storm solute transport in the subtropical Fushan Experimental Forest, NE Taiwan.
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300 $a 144 p.
500 $a Source: Dissertation Abstracts International, Volume: 55-09, Section: B, page: 3663.
500 $a Chairperson: Robert B. Harrison.
502 $a Thesis (Ph.D.)--University of Washington, 1994.
520 $a A series of solution collectors was set up and instrumented along flow paths to study the hydrogeochemical cycle and storm solute transport in the subtropical Fushan Experimental Forest in NE Taiwan. Results showed that significant changes in chemistry occurred when rainwater passed through forest and soil to become streamwater. Precipitation chemistry was dominated by Na and Cl, indicating an oceanic origin. When rainwater was intercepted by vegetation and moved downward as stemflow, concentrations of K, Ca, Mg, Cl, SO$\sb4$ and HCO$\sb3$ increased and K, Cl and SO$\sb4$ became dominant species indicating their leaching or washout from foliage and stems. Concentrations of NH$\sb4$ and NO$\sb3$ were decreased probably as a result of direct uptake by vegetation. Throughfall showed a significant increase in almost all cations and anions, including Na, K, Ca, Mg, NH$\sb4$, Cl, PO$\sb4$, SO$\sb4$ and HCO$\sb3$ over that of the rainwater indicating a direct input by canopy leaching and washoff by rainfall. The concentration of NO$\sb3$ decreased slightly. As water flowed through the soil matrix, concentrations increased for most ions relative to rainwater, stemflow and throughfall. Concentrations in the lateral flow from the forest floor, compared to other lateral flows, were higher for most ions, especially for NH$\sb4$, PO$\sb4$ and NO$\sb3$. This indicated that the forest floor might have an important role in providing sources for nutrient transport to the stream in this watershed. Because of active uptake by vegetation and soil microbes, ion concentrations in the soil solution from the rooting zone were the lowest in water collected belowground. When water flowed into deeper soil layers, concentrations of SO$\sb4$ increased dramatically, which also enhanced the leaching of cations like Na, Ca and Mg. Streamwater chemistry was dominated by Ca, Na, Mg, SO$\sb4$ and HCO$\sb3$, showing that the origin of streamwater in this watershed mainly consisted of subsurface flows from deeper soil horizons and streamwater chemistry was also partially controlled by in-stream processes.
520 $a As for storm solute transport, streamflow responded quickly to summer thunderstorm events. The time lags between peak rainfall and peak flow were generally about 35 minutes during summer thunderstorms, but were more than 10 hours during winter frontal storms. Changes of solute concentration during summer thunderstorms were stronger than those during winter frontal storms indicating relatively larger portions of near-surface water contributed to stormflow during summer thunderstorms. Conductivity, pH, Na, Ca, Mg, Cl, SO$\sb4$ and HCO$\sb3$ in streamflow exhibited decreases in concentrations with increasing flow rate both during summer and winter storms, but decreases were lower during winter frontal storms. Suspended solids, K, NH$\sb4$, NO$\sb3$ and total P showed increases with increasing flow rate, but little or no increases during winter frontal storms. These solute behaviors suggested that storm water chemistry was controlled by the relative mixing of near-surface flows and deep flows during storm events in this watershed. Results of hydrograph separation by using conductivity, HCO$\sb3$, Ca, Mg and SO$\sb4$ as tracers showed that total stormflow increases during storm events were due to increases both in near-surface flow and deep flow. Deep flow dominated the flow paths during moderate summer thunderstorms and winter frontal storms. The use of conductivity as the tracer for hydrograph separation appeared to give better results than HCO$\sb3$, Ca, Mg, and SO$\sb4$ in this watershed. (Abstract shortened by UMI.).
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650 4 $a Ecology. $3 516476
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792 $a 1994
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