摘要
本文根据我国不同地区沙漠化类型的面积、土壤有机碳的含量及沙漠化的正逆转速率，计算了我国沙漠化土地中有机碳的变动．结果表明，我国沙漠化土地0～50cm土层中有机碳的总贮量为753．143Mt，近40年来因土地沙漠化而释放到大气中的CO2总量达173．286Mt，而逆转过程中固定的CO2量为59．124Mt碳．所以，近40年来我国沙漠化土地净释放到大气中的C02量为124．475Mt，占全球温带和寒带土地每年释放CO2量133Mt碳的93．5％．
The change of organic carbon contents of the desertified land is calculated according to the area of descrtified land, organic carbon contcnt in soil and rate of desthefucation development or adverse processes in China. The results show that the total reserves of organic carbon are 753.143Mt, the carbon dioxide released to atmosphere is 173.286 Mt due to the land desertification, and the carbon dioxide assimilatcd from atmosphere in the adverse processes of desertification is 59.124 Mt in the last 40 ycars. Therefore, the net CO2 released to atmosphere is 124.475 Mt, which occupies 93.5% of the annual released CO2 (133 Mt) from the lands in the temperate zone and frigid zone in the world.
出处
《干旱区地理》
CSCD
北大核心
1995年第4期47-52,共6页
Arid Land Geography
基金
中国科学院沙坡头开放试验站基金
