气候变化对黑土有机碳库影响模拟研究

Simulation of climate impact on soil organic carbon pool in black soil

以黑龙江海伦为研究地点,利用CENTURY模型模拟了自然状态下的黑土在1953-2000年实际气象条件及以此为基础的9种气候变化情景下的土壤有机碳(0～20cm)。模拟结果表明,自然状态下的黑土在48年间实际气象条件下,土壤有机碳含量产生了波动;不同气候变化情景的模拟结果表明,温度升高或降水量的减少能够降低土壤有机碳含量,相反则有利于其升高,其中气温是影响黑土有机碳变化的主要气候因素。当气温升高2时,无论降水量不变、减少或增加20%,都能导致土壤有机碳含量下降。温度升高且降水量减少模式下的土壤有机碳含量最低,温度降低且降水量增加模式下的土壤有机碳含量最高。

CENTURY model is used to simulate effect of climate change on soil organic carbon (SOC)(0-20 cm) in Hailun natural grasslands, Heilongjiang province. The result shows that SOC is sensitive to climate change using historical weather records from 1953 to 2000. Under different scenarios of climate, simulation exhibits that SOC would reduce while the temperature increases, which indicates that temperature is the key climatic factor influencing SOC. SOC level is the highest under the pattern of temperature decrease and precipitation increase, while the lowest under the contrary pattern.