Chen H W, Yen J H, Chung R S, Lai C M, Yang S S, Wang Y S
Department of Agricultural Chemistry, National Taiwan University, Taipei, ROC.
Proc Natl Sci Counc Repub China B. 2001 Oct;25(4):239-47.
The carbon dioxide flux density in a subtropical cultivated rice paddy field were determined over four crop seasons (two consecutive years) at five stages of rice plant development, transplanting, active tillering, booting, flowering and ripening, and an idle period between crops. During 24 h sampling periods at those stages, the CO2 flux densities were measured and found to be -2,000 to 55,000 mg CO2/m2/day in the first year and 600 to 29,000 mg CO2/m2/day in the second year in acrylic chambers covering rice plants. The CO2 flux densities in glass domes without plants but with soil were -700 to 6,000 mg CO2/m2/day in the first year and 147 to 4,500 mg CO2/m2/day in the second year. The data for the CO2 flux density over an entire year are extrapolated. Although our non-controlled environment experiments have inherent drawbacks, the collected data indicate that continuous rice cultivation has a tendency to result in increased CO2 emissions.
在亚热带种植的稻田中，于四个作物季节（连续两年）对水稻生长的五个阶段（移栽、分蘖盛期、孕穗期、开花期和成熟期）以及作物间的休耕期，测定了二氧化碳通量密度。在这些阶段的24小时采样期间，测量了二氧化碳通量密度，发现在覆盖水稻植株的丙烯酸箱中，第一年为-2000至55000毫克二氧化碳/平方米/天，第二年为600至29000毫克二氧化碳/平方米/天。在没有植物但有土壤的玻璃穹顶中，第一年的二氧化碳通量密度为-700至6000毫克二氧化碳/平方米/天，第二年为147至4500毫克二氧化碳/平方米/天。推算出了全年二氧化碳通量密度的数据。尽管我们的非受控环境实验存在固有缺陷，但收集到的数据表明，持续种植水稻有导致二氧化碳排放增加的趋势。
