以主成份分析探討福山試驗林哈盆溪流域水化學的空間變異性

Principal Component Analysis of the Spatial Variability of Water Chemistry in the Hapen Basin of the Fushan Experimental Forest

劉瓊霦(Chiung-Pin Liu) ； 陳春雄(Chun-Hsiun Chen) ； 金怛鑣(Hen-Bian King)

《台灣林業科學》 19卷4期 (2004/12) Pp. 363-374

https://doi.org/10.7075/TJFS.200412.0363

摘要

本研究從2000年1月到2003年12月，每個月2次，於福山試驗林的哈盆溪流域設置七個水樣取樣點，監測期間電導度、懸浮值、pH、鈉、鉀、鈣、鎂、銨態氮、氟、氯、硝酸根、硫酸根、碳酸氫根、溶解性無機碳、溶解性有機碳、總氮等16項溪流水水化學的變化。以單一的主成份分析計算原來的16項溪流水水化學的變項，歸納其影響因子主要包括：(1)大氣沉降、化學風化作用及海鹽飛沬，約佔全部變異量的47%;(2)植生影響因子，包括養分的吸收、淋洗及淋溶等，約佔全部變異量的14%; (3)集水區的土壤及水文的影響，約佔全部變異量的17%; (4)其他因子，約佔全部變異量的22%，其變異來源應包括有東北季風的吹襲、微氣候或其他生物作用的影響等。

關鍵字

主成分分析 ； 哈盆溪 ； 水化學 ； 福山試驗林

並列摘要

Stream water chemistry was investigated twice a month in the Hapen basin of the Fushan Experimental Forest located in northeastern Taiwan from January 2000 to December 2003 at 7 sampling points. Samples were analyzed for conductivity, solid, pH, Na, K, Ca, Mg, NH4, F, Cl, NO3, SO4, HCO3, DIC, DOC, and total N. Principal component analysis (PCA) was used to identify controls on the development of the water components. Results indicated that factors which affected water chemistry in this basin included (1) precipitation, chemical weathering, and sea salt aerosol influence, together which explained 47% of the variance in the data; (2) a vegetation type factor, including nutrient uptake and leaching, which explained 14% of the variance in the data; (3) soil and hydrology of this watershed, which explained 17% of the variance in the data; and (4) other factors, including the winter monsoon, micro weather patterns, or other biological effects, which explained 22% of the variance in the data.

並列關鍵字

principal component analysis ； Hapen creek ； water chemistry ； Fushan Experimental Forest