對於台灣西南部稀土元素的含量與來源以及土壤物性與稀土元素關聯性的報導鮮少，且全球對於稀土元素的需求也日益增加，因此探討台灣西南部的稀土元素、稀土礦物以及土壤物性為本研究的重點。
本研究對台灣西南部的土樣進行多項土壤物性試驗獲得各土樣之物理性質，並以X光繞射儀及掃描式電子顯微鏡測定不同土樣中稀土礦物-獨居石的含量以及產狀，同時利用X光螢光分析儀與感應耦合電漿質譜儀精確測量土樣中主量與稀土元素的含量，並比較稀土元素於研究區域中的變化。
X光繞射結果顯示獨居石確實存在於土樣之中，且半定量擬合結果顯示其含量約0.1至0.6 wt%（1000-6000 ppm），以中央山脈茂林板岩含量最高，西部麓山帶及西南海岸次之，西南外海最低。研究區域中、下游之次生獨居石產狀與中央山脈變質砂岩之獨居石外觀相似，且被褐簾石過度生長的獨居石源於變質帶。而土樣中SiO2含量均高於上部大陸地殼平均(UCC)，表明了富含石英，主要長石成分的消耗也表示長石可能在風化過程中損失。各土樣之稀土濃度差異不大，大部分在150-350 ppm之間，僅YH-03樣本之稀土濃度較其他樣本高出許多，約1576 ppm。土壤物性與總稀土濃度無太大的關聯性，然而重稀土會吸附在黏土礦物上，使得土壤粒徑越小其重稀土元素的含量越高。本研究區域之平均稀土濃度為297.63 ppm，高於主要稀土開採國家（98.4-154.6 ppm），表明台灣西南部之土樣具有開採的潛力。

There is a scarcity of reports concerning the content and sources of rare earth elements in the southwestern region of Taiwan, as well as the correlation between soil properties and rare earth elements. Furthermore, the global demand for rare earth elements is steadily increasing. Thus, this study's main focus is on investigating the rare earth elements, rare earth minerals, and soil properties in the southwestern region of Taiwan.
In this research, various soil samples were subjected to soil property tests to determine their physical characteristics. The content and occurrence of monazite, a rare earth mineral, were measured using X-ray diffraction and scanning electron microscopy. Additionally, X-ray fluorescence analysis and inductively coupled plasma mass spectrometry were employed to measure both major and rare earth element content in the soil samples.
X-ray diffraction results indicated that the monazite content ranged from approximately 0.1 to 0.6 wt% (1000-6000 ppm), with the highest content found in Maolin slate and the lowest in the southwestern offshore region. The occurrence of secondary monazite in the study area resembled the appearance of monazite in the metamorphic sandstone of the Central Mountain Range. Most soil samples exhibited rare earth element concentrations between 150 and 350 ppm, with only the YH-03 sample having a higher rare earth element concentration, approximately 1576 ppm. Soil properties showed no correlation with total rare earth element concentrations, while smaller soil particle sizes were associated with higher concentrations of heavy rare earth elements. The average rare earth element concentration in the study area was 297.63 ppm, which is higher than those of major rare earth-producing countries (98.4-154.6 ppm).

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