Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/88083
標題: 森林集水區對酸性與非酸性沈降之水化學變化-以台灣北部文山林場為例
Changes of Water Chemistry for Acid and Non-Acid Precipitation at a Forested Watershed-A Case Study of the Wenshan Forest Station in Northern Taiwan
作者: 王秋嫻
劉瓊霦
陸象豫
林介龍
蔡真珍
Chiu-Hsien Wang
Chiung-Pin Liu
Shiang-Yue Lu
Chieh-Lung Lin
Chen-Chen Tsai
關鍵字: Acid precipitation
Throughtfall
Soil solution
Streamwater
Water chemistry
酸性沈降
穿落水
土壤水
溪流水
水化學
摘要: This study grouped rainfall and water samples which were collected from March 2009 to February 2012 at Wenshan Forest Station into acid precipitation (pH≤5.0) and non-acid precipitation (pH>5.0) two categories for investigating changes of water chemistry after it passing through canopy (throughfall), soil layers (soil solution) and draining into stream. Results from 47 valid events indicated that samples from non-acidic precipitation category contained a higher concentration of Na^+, Ca^(2+), Mg^(2+), HCO3^- and other alkaline ions. Except for concentration of F, there was no significant differences of ions concentrations between these two categories in throughfall, soil solution of 15, 30 cm depths and this phenomenon illustrated that this forest ecosystem had great buffering capacity for acid precipitation. However, soil solution at 60cm depth had higher concentrations of Ca^(2+), HCO3^-, anions and cations for non-acid precipitation. Samples of streamwater of non-acid precipitation category contained higher Mg^(2+) concentration but lower Cl^- and NO3^- concentrations in comparison with those of acid precipitation category. We speculated that differences in ions of streamwater may be affected by discharge of streamflow and characteristics of atmospheric precipitation. Results from above indicated that water chemical properties of soil solution at 60cm depth and streamwater have close relationship with those of gross rainfall in this area.
This study grouped rainfall and water samples which were collected from March 2009 to February 2012 at Wenshan Forest Station into acid precipitation (pH≤5.0) and non-acid precipitation (pH>5.0) two categories for investigating changes of water chemistry after it passing through canopy (throughfall), soil layers (soil solution) and draining into stream. Results from 47 valid events indicated that samples from non-acidic precipitation category contained a higher concentration of Na^+, Ca^(2+), Mg^(2+), HCO3^- and other alkaline ions. Except for concentration of F, there was no significant differences of ions concentrations between these two categories in throughfall, soil solution of 15, 30 cm depths and this phenomenon illustrated that this forest ecosystem had great buffering capacity for acid precipitation. However, soil solution at 60cm depth had higher concentrations of Ca^(2+), HCO3^-, anions and cations for non-acid precipitation. Samples of streamwater of non-acid precipitation category contained higher Mg^(2+) concentration but lower Cl^- and NO3^- concentrations in comparison with those of acid precipitation category. We speculated that differences in ions of streamwater may be affected by discharge of streamflow and characteristics of atmospheric precipitation. Results from above indicated that water chemical properties of soil solution at 60cm depth and streamwater have close relationship with those of gross rainfall in this area.
URI: http://hdl.handle.net/11455/88083
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