土壤粒径分析试验方法之比较Comparisonofthesoilparticlesize.PDF

土壤粒徑分析實驗方法之比較 (1) (2) (3) 林佳燕 蔡義誌 林俐玲 摘 要 粒徑分佈是最常用來判定土壤質地的方法，而農藝及工程上也經常需要使用粒徑分佈來將 土壤質地做分類，而本研究主要是利用兩種最廣泛被使用的方法--吸管法(Pipette sampling)及比 重計法(hydrometer method)來決定粒徑分佈情況，並比較兩者間的差異。結果顯示，二種方法 都將試驗的土樣分類為相同質地，由於兩種方法的程序皆繁瑣費時，但吸管法在事先分離砂粒 時需要許多額外的事前步驟，因此若樣本數目很多時，則相對較費時；而雖然比重計法有少許 人為及儀器誤差，但其與吸管法比較的結果無明顯差異，因此若樣本數較多時，建議使用比重 計法。 關鍵詞( ：粒徑分析、吸管法、比重計法、Stokes Law) Comparison of the soil particle size analysis experiment method Chia-Yen Lin (1) , Yi-Zhih Tsai (2) , Li-Ling Lin (3) Graduate Students (1) (2) and Professor (3) ,Department of Soil and Water Conservation , National Chung Hsing University , Taichung ,Taiwan 402,ROC ABSTRACT The particle-size distribution is one of the most common used methods of soil texture determination. It is used in textural analysis to classify soils for both agronomic and engineering purposes, and this research mainly uses two kinds of widely used methods which are pipette sampling and hydrometer method to decide particle-size distribution, and compares the difference between the two methods. The soil samples determined with these two methods have same texture, and although the (1)國立中興大學水土保持學系研究生 (2)國立中興大學水土保持學系博士研究生 (3)國立中興大學水土保持學系教授 139 水土保持學報 41(2) ：139-152 (2009) Journal of Soil and Water Conservation, 41(2) ：139-152 (2009) procedures of these methods are very time-consuming , but the pipette method, requires the additional step of separating the sand. When analyzing a lot of soil samples, pipette method is more time-consuming. Therefore, the hydrometer method was recommended . (Keywords : The Particle-Size Analysis, Pi