土壤碳氮磷化學計量對於維持土壤品質、養分循環以及森林生態系健康都有相當重要的影響，但對於造林過程土壤碳氮磷化學計量討論仍不清楚。本研究中將針對新植闊葉樹與針葉樹造林地，以及不同土壤深度進行土壤碳氮磷化學計量分佈相關性，與其影響土壤碳氮磷化學計量因子進行探討。試驗中選擇臺大實驗林中低海拔新植闊葉樹造林地9處以及鄰近針葉樹造林地6處進行採樣與土壤性質分析。結果發現碳氮磷含量隨土壤深度增加而降低，另一方面，碳氮比則隨著土壤深度的增加而增加。此外，土壤總體密度分別與土壤有機碳、總氮、有效性磷及總磷含量呈顯著負相關。再者，新植闊葉樹造林地表層土壤0-10cm之碳磷與氮磷比較針葉樹造林地高，也反應了造林初期土壤磷對森林生長的限制。本研究結果也顯示表層土壤的碳氮磷含量在造林初期容易因枯落物快速分解，並隨可溶性有機質洗出。研究中也發現，表層土壤碳磷與氮磷比也反應出造林初期土壤中磷對森林生長的限制，而當造林後幼苗生長林相相對鬱閉，土壤中碳氮磷儲量相對能持續累積。

Soil C, N, and P stoichiometry plays an important role in maintaining soil quality, nutrient cycling, and forest ecosystem health. However, the discussion on soil C, N, and P stoichiometry during afforestation remains unclear. In this study, we investigate the correlation between the distribution of soil carbon, nitrogen, and phosphorus stoichiometry and the factors affecting soil carbon, nitrogen, and phosphorus stoichiometry in broad-leaved afforestation and coniferous plantation sites at different soil depths. In the experiment, 9 broad-leaved afforestation sites and 6 coniferous plantation sites were selected for sampling and soil properties analysis. It was found that the soil carbon content, total nitrogen, and phosphorus decreased with increasing soil depth. Conversely, the C/N ratio increased with increasing soil depth. In addition, the overall soil density was significantly correlated with soil organic carbon, total nitrogen, available phosphorus and total phosphorus content, respectively. Furthermore, the C/P and N/P ratios at the 0-10 cm depth of the surface soil in broad-leaved afforestation are higher than those in coniferous plantations. This implies the limitation of soil phosphorus on forest growth in the initial stage of afforestation. The results of this study also showed that the C, N, and P contents of surface soil were susceptible to rapid decomposition of litter during the initial stage of afforestation, leading to leaching with dissolved organic matter. The study also found that the C/P and N/P ratios in the surface soil reflect the limitation of phosphorus in the soil on forest growth in the initial stage of afforestation. As the afforestation time prolongs and the canopy becomes relatively closed, the carbon, nitrogen, and phosphorus stocks in the soil can continue to accumulate relatively.