道路生態工程碳排量較少被量化研究，為了解其環境衝擊量，需要計算其生命週期階段之碳足跡。本研究以台灣某道路案例，分析於生命週期材料生產、施工及維護三階段的碳排量。
本研究蒐集案例工程價目表中生態工程工項材料、施工及機關業主維護階段數量、成本資料，及機具單位成本、生產力數字，估算機具單位油耗，查詢碳排係數，以計算生命週期三階段造成的碳排放量，並計算維護年限與碳足跡之關係及分析生態效率。
研究結果顯示，綜合排水、生態及植生三類工作，施工及維護階段成本分別有61%及40%納入本研究分析，而三類工作納入分析為51%、86%及46%，且材料生產成本佔三類工作金額之54%。
關於碳排放，材料生產以排水工作佔93 %最高，生態工作次之，植生工作佔3 %最低；施工碳排以生態工作佔57 %最高，排水工作次之，植生工作佔3 %；維護碳排以生態工作佔51%最高，植生工作次之，排水工作佔15 %最低。故需降低材料生產碳排最需由排水工作材料減量，施工及維護碳排需由生態工作減量。
案例道路生態工程排碳量，材料生產佔65%為最大，施工階段29%次之 (材料運輸14%、機具施作15%)，維護階段6%最小 (運輸0%、機具6%)。本案例生態工程施工產生之碳量佔94%，維護階段產生碳量為6%。
本案例工程約第4年時，碳排等於固碳量，初期碳排主要為材料生產及施工階段，若能將其碳排減低，則可提早達成碳排平衡。

There is less quantitative research on carbon emission of ecological engineering of roadways. To comprehend ecological engineering’s impact on the environment, it needs to calculate the carbon footprint in its life cycle. This study adopted a case of a roadway in Taiwan to analyze the carbon emissions of its three life cycle stages, including material production, construction, and maintenance.

This research collected the case project’s quantities of ecological engineering’s items including materials and consutrction equipment, the owner’s maintenance cost information, equipment productivity figures, and estimated unit fuel consumption of equipment. It also searched their carbon emission coefficients to calculating carbon emissions for three stages of life cycle.

For the drainage, ecology and vegetation work, the cost of construction and maintenance analyzed in this study is 61% and 40%, respectively. The three categories of work included in the analysis are 51%, 86% and 46%, respectively. Material production is 54% of the cost amount.

Regarding carbon emission, drainage is the highest (93%) in material production, ecology 2nd, and vegataion the lowest (3%). Regarding carbon emission in maintenance, ecology is the highest (51%), vegetation 2nd, and drainage the lowest (15%). Hence, lowering drainage material quantity is most crucial for carbon emission in material production, and lowering ecology work is most crucial for carbon emission in construction and matainenance.

In carbon emission in ecological engineering for roadways, material production is the largest (65%), construction phase 2nd (29%) (material transportation 14%; equipment 15%), maintenance phase the smallest (6%) (transportation 0%; equipment 6%). Carbon emission from ecological engineering construction is 94%, and maintenance phase is 6%.

For the case project in approximately the 4th year, its carbon emission volume would equal the carbon sequestration volume. Its initial carbon emission comes from mainly the material production and construction. If the carbon emission volume can be lowered , carbon balance can be achieved earlier.

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