台灣北部現行耕作制度對農田土壤溫室氣體(CO2、CH4、N2O)釋出之影響

Effects of Current Cropping Systems on Emissions of Greenhouse Gases (CO2, CH4, N2O) from Agricultural Soils in Northern Taiwan

柯光瑞(Guang-Ruei Ke) ； 賴朝明(Chao-Ming Lai)

《臺灣農業化學與食品科學》 44卷1期 (2006/02) Pp. 63-73

https://doi.org/10.6578/TJACFS.2006.008

摘要

本研究目的為探討台灣北部現行耕作制度對農田土壤溫室氣體(CO2、CH4、N2O)釋出之影響，並評估其對農田土壤溫室氣體排放之減量潛力。在台灣北部選取四處相近但不同耕作制度之農田土壤，以密閉罩法進行前述三種溫室氣體釋出量之田間估測。結果顯示：台灣北部四種耕作制度間之溫室氣體排放總量以二氧化碳當量計算之，其在水田－水田、水田－旱田、旱田－水田與旱田－旱田四種耕作制度中分別為：20,707、8,486、13,324與7,399 kg C/ha/y，以「旱田－旱田」為最低，最高則是「水田－水田」。因此，若採用適當之耕作制度，其溫室氣體釋出之減量潛力估計平均約為7,460 kg C/ha/y（範圍在1,087至13,308 kg C/ha/y之間）。本文亦提出於前述四種耕作制度下，分別以逐步迴歸分析探究三種溫室氣體與環境因子關係之結果，期供學術研究及實際應用於溫室氣體減量之參考。

關鍵字

耕作制度 ； 農田土壤 ； 溫室氣體 ； 二氧化碳 ； 甲烷 ； 氧化亞氮

並列摘要

Effects of current four cropping systems, including paddy-paddy, paddy-upland, upland-paddy, and upland-upland on emissions of greenhouse gases (CO2, CH4, N2O) from agricultural soils in northern Taiwan were examined by a closed chamber method. The results showed that the total emissions of the three greenhouse gases (expressed as total CO2 equivalents) for the four cropping systems (paddy-paddy, paddy-upland, upland-paddy, upland-upland) were 20,707, 8,486, 13,324, and 7,399 kg C/ha/y, respectively. The mitigation potential of total greenhouse gases emissions could range from 1,087 to 13,308 kg C/ha/y, with a mean value of 7,460 kg C/ha/y. The results of forward stepwise regression analysis were also presented to examine the relationships among the emissions of the greenhouse gases and the environmental factors. The results obtained in this study could be used for the references of the mitigation of greenhouse gases emissions from agricultural soils.

並列關鍵字

Cropping system ； Agricultural soil ； Greenhouse gas ； Carbon dioxide ； Methane ； Nitrous oxide