亞熱帶山地集水區溶解態無機氮輸出之觀測與模擬(國科會)

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Project title/計畫英文名

Project Number/計畫編號

99R40044(黃誌川)

Translated Name/計畫中文名

亞熱帶山地集水區溶解態無機氮輸出之觀測與模擬(國科會)

Project Principal Investigator/計畫主持人

JR-CHUAN HUANG

Funding Organization

Ministry of Education

Start date/計畫起

03-11-2010

Expected Completion/計畫迄

02-11-2011

摘要：自工業革命以來，人類活動產生了大量的氮在陸域系統，這些氮主要來自人工肥料、人口成長與豆類耕種等。而這些超量的氮輸入也正威脅或改變著原本陸域系統、溪流系統的穩定性與樣貌。更甚者，這些超量的氮（以無機氮為主）經由溪流系統進入海岸地帶將會造成海草棲地、海岸地區生物多樣性的破壞與優養化，這些具體的環境威脅凸顯了河川溶解性無機氮輸出的重要性。然而，目前國際上對亞熱帶地區的無機氮的輸出過程了解卻不夠具體且觀測資料上也非常不足。且目前國內的觀測與國際上的模式推估有不少的落差，因此，本研究擬以三年的時間對淡水河流域進行土壤採樣並對雨水、土壤水、溪流水進行監測，配合颱風期間的採樣，希望能建立一組完整的系統性觀測數據，也希望能基於此觀測數據建立亞熱帶地區的溪流溶解態無機氮的輸出模式。此系統性觀測數據不但能增進對無機氮輸出過程的理解。而溪流溶解態無機氮的輸出模式則可對土地經營提供參考也可應用至其他監測數據不足的流域，以增進區域尺度或全球尺度的估算。
Abstract: Since industrial revolution, human activities had dramatically increased the amount of nitrogen cycling in terrestrial ecosystems. Most of the excess nitrogen was originated from artificial fertilizer, population growth, and cultivation of legumes. In fact, the excess nitrogen caused the substantial risks to terrestrial and river ecosystems. Furthermore, the excess nitrogen transported by rivers to coastal zones would result in serious eutrophication, including the loss of seagrass, decrease of biodiversity and increase of harmful algae blooms. Those specific threats highlight the importance of DIN (dissolved inorganic nitrogen) export from watersheds. However, the nitrogen cycling processes within watersheds in subtropical zones were poorly understood due to the lack of observations. Therefore, we propose a 3-yr proposal aims to sample the DIN in rainfall, soil water, and streamwater with other geochemical parameters and the soil samples to increase the understanding of nitrogen cycling processes. Based on the comprehensive dataset, we attempt to build up a DIN export model for meso-catchment scale. The former is also useful for land management and planning. The later can apply to the watersheds with insufficient data and improve the accuracy of DIN export estimation in region and global scale.

Keyword(s)

氮循環
優養化
溶解態無機氮
山地集水區
nitrogen cycling
eutrophication
dissolved inorganic nitrogen
mountainous catchment

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亞熱帶山地集水區溶解態無機氮輸出之觀測與模擬(國科會)

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