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温室气体及全球气候变暖已成为当今人们普遍关注的问题。有关碳循环方面的研究很多 ,但有关浅表层地下水中总有机碳 (TOC)含量及流失方面的研究很少。 1989～ 1998年 10a间美国学者L .Bowens等人利用渗透计测定玉米—大豆轮作区渗透水中TOC含量 ,该值为 0 5～ 6 0mg L。草地泉水中TOC含量一般介于 1～ 3mg L ,变率比农地的小。两种管理措施 (玉米—大豆轮作、草场 )平均每年流失的TOC为 3 7～ 6 0kg hm2 。
Greenhouse gases and global warming have become the common concerns of people today. There are a lot of researches on the carbon cycle, but little research has been done on the total organic carbon (TOC) and the loss of groundwater in shallow groundwater. During the period from 1989 to 1998, the American scholar L.Bowens et al. Used the infiltrometer to determine the TOC content of infiltrating water in maize-soybean rotation zone, which value is 0 5 ~ 60mg. Grassland spring water TOC content is generally between 1 ~ 3mg L, the rate of change is smaller than the farmland. The average annual TOC lost by both management measures (corn-soybean rotation, pasture) is 37 to 60 kg hm2.