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氣候變化研究進(jìn)展 ?? 2009, Vol. 5 ?? Issue (05): 291-297.
王平1,黃耀2,張穩2
Wang Ping,HUANG Yao,Wen ZHANG
摘要: 將稻田甲烷排放模型CH4MOD和GIS空間化數據庫結合,模擬估計了中國大陸1955-2005年水稻生長(cháng)季稻田甲烷排放量。結果表明:中國稻田甲烷排放總體呈增加趨勢,1960年代、1970年代、1980年代和1990年代年均排放量分別為(3.18±0.53)、(4.71±0.27)、(5.22±0.24)和(5.79±0.34)Tg,2000-2005年平均排放量為(6.25±0.36) Tg。1960-1975年增加最快,速率為0.167 Tg/a;自1970年代中期開(kāi)始增加速率減緩,為0.054 Tg/a。中國稻田甲烷排放高值區主要分布在湖南、湖北、江西、廣東、廣西、江蘇和安徽省,約占全國稻田甲烷排放總量的73.2%。自1980年代初以來(lái),東北三省稻田甲烷排放增加顯著(zhù),這主要歸因于該區水稻種植面積的迅速擴大。
關(guān)鍵詞: CH4MOD, 稻田, 甲烷排放, 時(shí)空變化
Abstract: Methane emission during rice-growing season in China's paddies was estimated over the period 1955-2005 by linking the CH4MOD, a model for simulating rice paddy CH4 emission, to a GIS database. Model estimates indicate that the CH4 emission from China's rice paddies increased generally over the fifty years. The quantities of annual CH4 emission were estimated to be (3.18±0.53), (4.71±0.27), (5.22±0.24) and (5.79±0.34) Tg in the 1960s, 1970s, 1980s and 1990s, respectively; and the mean amount of annual CH4 emission from 2000 to 2005 was estimated to be (6.25±0.36)Tg. A rapid increase in CH4 emission occurred in the period 1960-1975, with a mean growth rate of 0.167 Tg/a, while the growth rate decreased to 0.054 Tg/a from 1976 to 2005. Higher CH4 emission occurred in Hunan, Hubei, Jiangxi, Guangdong, Guangxi, Jiangsu and Anhui provinces, accounting for approximately 73.2% of the national total CH4 emission from rice fields. Methane emission in Northeast China was estimated to have increased significantly since the early 1980s, which is mainly attributed to an expansion of rice cultivation.
Key words: CH4MOD, rice fields, methane emission, spatio-temporal change, China
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