The Chemistry of Precipitation and Throughfall of Three Forest Stands in Central Taiwan

臺灣中部雨水與三種林分穿落水的化學組成

劉瓊霦(Chiung-Pin Liu) ； 許博行(Bor-Hung Sheu)

《台灣林業科學》 12卷4期 (1997/12) Pp. 379-386

https://doi.org/10.7075/TJFS.199712.0379

摘要

本試驗的目的在臺灣中部關刀溪試驗集水區內選定相鄰的杉木林、次生闊葉樹林及天然闊葉樹林三種不同林分，調查比較雨水流經此三種不同林分，即穿落水中離子濃度的變化及差異（1995年7月到1996年6月），結果顯示此三個林分每次所收集之水樣的無機離子濃度差異甚大。其中天然及次生闊葉樹林穿落水的陽離子除H(上標 +)和Na(上標 +)外，其餘皆高出雨水甚多，杉木林則除Na(上標 +)，NH4(上標 +)，SO4(上標 2-)及HCO3(上標 -)等離子外，其他離子之濃度亦較雨水高，唯其增加量較緩和，其中H(上標 +)的增加係數在杉木林為1.08，高出闊葉樹林之增加係數0.05及0.21甚多。三林分之穿落水的離子濃度在一年當中時，以冬天的濃度最高，尤其是十一月，且以次生林為最明顯。

關鍵字

雨水 ； 穿落水 ； 杉木林 ； 次生林 ； 天然林

並列摘要

The study objectives were to compare changes of ion concentrations and seasonal differences of throughfall for 3 types of forest stands, China-fir (Cunninghamia lanceolata) plantation, secondary hardwood stand, and natural hardwood stand in Guandaushi Forest, in central Taiwan from July 1995 to June 1996. Seasonal changes of concentrations of throughfall were higher in the winter especially in November, and the secondary hardwood stand had the highest concentrations. The standard deviation of enrichment factors of ion concentrations varied greatly among these 3 stands. Most cation concentrations from the natural and secondary hardwood stands were considerably higher than were precipitation concentrations except for H(superscript +) and Na(superscript +) Most ion concentrations from China-fir also showed higher values than the precipitation concentrations except for Na(superscript +), NH4(superscript +), SO4(superscript 2-) and HCO3(superscript -). The enrichment factor of H of China-fir was 1.08 which greatly exceeded the enrichment factors of 0.05 and 0.21 for natural and secondary hardwoods, respectively.

並列關鍵字

precipitation ； throughfall ； China-fir stand ； secondary hardwood stand ； natural hardwood stand