2023-01-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/672321化石燃料燃燒和氮 (N) 肥料使用等人類活動極大地改變了全球氮循環，並大大加速了活性形式氮的形成和大氣氮沈降。陸地和水生生態系統中氮沉降的增加，對人類具有重要意義，包括生態系統健康、生物地球化學循環、溫室氣體平衡和生物多樣性等。本子項目採集溪頭地區乾、濕氮沉降數據，並進行長期氮沉降對樹木生長和土壤生態系統的潛在影響試驗研究。我們的目的是 (1) 收集溪頭沿海拔梯度的干濕氮沉降，並確定其季節和年際模式； (2) 通過在溪頭人工林中施氮來模擬氮沉降增加，用以觀察長期氮積累後對樹木生長和土壤特性的潛在影響。 Human activities such as the combustion of fossil fuels and nitrogen (N) fertilizer use have drastically altered the global N cycle and greatly accelerated the formation and deposition of reactive forms of N. Such increased N deposition in terrestrial and aquatic ecosystems has significant implications for human and ecosystem health, biogeochemical cycles, greenhouse gas balances, and biological diversity. In this subproject, the dry and wet N deposition were collected in the Xitou areas. We determined the potential impacts of chronic N accumulation on both tree growth and soil ecosystem. We aimed (1) to collect dry and wet N deposition along an elevation gradient in Xitou and identify its seasonal and interannual patterns; and (2) to mimic elevated N deposition through N application on the forest plantations in Xitou and determine the potential impacts on tree growth and soil properties after chronic N accumulation.氮沉降;施肥;土壤溶液;林分生長;Nitrogen deposition; Fertilization; Soil solution; Stand growth