本研究自2010年9月至2012年5月期間監測七股潟湖與虎頭埤的水質，二氧化碳(CO2)、甲烷(CH4)及氧化亞氮(N2O)的釋放通量、水中藻總初級生產量及底泥有機碳密度，進而判斷該場址為碳儲場或是碳的排放源。七股潟湖主要是陸上魚塭跟七股海域的緩衝水域，波浪與海流較外海穩定，而且可以保存水中的養分，使水質得以淨化，能吸收和儲存洪水、調節水位，阻緩洪水速度，減少災害。而虎頭埤則為一座水庫主要作為灌溉用途，由虎頭埤所分流的灌溉用水，供給了五百多公頃的農地水源。
本研究以漂浮箱採氣及氣體層析法監測湖塘水面與大氣交界面的CO2，CH4， N2O通量變化。結果顯示，七股潟湖CO2釋放通量介於0.03～14.46 mg CO2-C m-2 h-1，估算整年平均CO2釋放通量介於，12.96~107.06 g CO2-C m-2 yr-1；虎頭埤CO2釋放通量介於-4.79～60.57 mg CO2-C m-2 h-1，估算整年平均CO2釋放通量介於30.55~149.86 g CO2-C m-2 yr-1。七股潟湖CH4釋放通量介於-0.22～0.62 mg CH4-C m-2 h-1，估算整年平均CH4釋放通量介於，0.66~2.81 g CH4-C m-2 yr-1；虎頭埤CH4釋放通量介於0.08～3.88 mg CH4-C m-2 h-1，估算整年平均CH4釋放通量介於6.44~22.16g CH4-C m-2 yr-1。七股潟湖N2O釋放通量介於-0.52～27.85 μg N2O m-2 h-1，估算整年平均N2O釋放通量介於，30.28~113.37 mg N2O m-2 yr-1；虎頭埤N2O釋放通量介於1.39～32.31 μg N2O m-2 h-1，估算整年平均N2O釋放通量介於85.86~110.55 mg N2O m-2 yr-1。七股潟湖與虎頭埤溫室氣體通量皆呈現與河口(溪口)距離相關，距離河口越近則釋放通量越高，而比較兩場址CO2、N2O釋放通量並無明顯差異(p>0.05)，CH4則有明顯差異(p= 0.00981<0.05)。
本研究利用水中植物性浮游生物初級生產量測量方法估算水中的總初級生產量(GPP)，結果顯示七股潟湖與虎頭埤的總初級生產量分別為23.29～47.88 mg C m-2 h-1及51.5～110.53 mg C m-2 h-1。而測量底泥碳密度，七股潟湖介於1.28~1.70 kg m-2。虎頭埤之底泥有機碳密度介於2.41~3.57 kg m-2。可推估七股潟湖與虎頭埤底泥有機碳庫量分別為，14,502以及764 ton C。 This research monitored the water quality at Chiku Lagoon and Hu-Tou-Pi Reservoir , the gross primary production of algae and the release flux of CO2、CH4 and N2O, and the density of organic carbon in the soil since September 2010 to May 2012, further determine whether this site is carbon storage field or the emission sources of carbon. Chiku Lagoon is mainly the buffer water zone between onshore fish farms and Chiku water zone. The waves and ocean currents there are more stabilized than open sea, and it can preserve the nutrients in the water and purify the water quality. It can also absorb and store up floodwaters , moderate the water line and retard the velocity of floodwaters to reduce the frequency of disasters. Hu-Tou-Pi Reservoir is mainly used for irrigation, and the irrigation water divided from Hu-Tou-Pi Reservoir supplies the water sources of approximately five hundred hectares farmland.
Floating box and Gas Chromatography are used in this research to collect gases and monitor the flux change of CO2、CH4 and N2O of the interface between lake and atmosphere. The results show that Chiku Lagoon’s CO2 release flux is between 0.03 and 14.46 mg CO2-C m-2 h-1. It is estimated that the average CO2 release flux throughout the year is between 12.96 and 107.06 g CO2-C m-2 yr-1； Hu-Tou-Pi Reservoir’s CO2 release flux is between -4.79 and 60.57 mg CO2-C m-2 h-1. It is estimated that the average CO2 release flux throughout the year is between 30.55 and 149.86 g CO2-C m-2 yr-1. Chiku Lagoon’s CH4 release flux is between -0.22 and 0.62 mg CH4-C m-2 h-1. It is estimated that the average CH4 release flux throughout the year is between 0.66 and 2.81 g CH4-C m-2 yr-1；Hu-Tou-Pi Reservoir’s CH4 release flux is between 0.08 and 3.88 mg CH4-C m-2 h-1. It is estimated that the average release flux throughout the year is between 6.44 and 22.16 g CH4-C m-2 yr-1. Chiku Lagoon’s N2O release flux is between -0.52 and 27.85 μg N2O m-2 h-1. It is estimated that the average N2O release flux throughout the year is between 30.28 and 113.37 mg N2O m-2 yr-1；Hu-Tou-Pi Reservoir’s N2O release flux is between 1.39 and 32.31 μg N2O m-2 h-1. It is estimated that the average N2O release flux throughout the year is between 85.86 and 110.55 mg N2O m-2 yr-1. Greenhouse gases at Chiku Lagoon and Hu-Tou-Pi Reservoir all show the relevance with the distance between the estuary and the two places. The closer is the distance; the higher is the release flux. Comparing the release flux of CO2、N2O at the two places and it shows no apparent differences(p>0.05). However, the release flux of CH4 at the two places shows apparent differences(p= 0.00981<0.05).
Submerged botanical plankton primary production measurement method is used in this research to estimate the underwater gross primary production. The results show that the gross primary production at Chiku Lagoon and Hu-Tou-Pi Reservoir are 23.29～47.88 mg C m-2 h-1 and 51.5～110.53 mg C m-2 h-1, respectively. Measuring the density of carbon in the soil, Chiku Lagoon’s density of carbon in the soil is between 1.28 and 1.70 kg m-2, and Hu-Tou-Pi Reservoir’s density of carbon in the soil is between 2.41 and 3.57 kg m-2. It can be inferred that the amount of carbon pool in the soil at Chiku Lagoon and Hu-Tou-Pi Reservoir are 14,502 and 764 ton C, respectively.
