有机物料施用量对土壤CO_2排放速率的影响

Influence of organic material amount on CO_(2) released rate from the soil

本试验选用有机碳含量不同的黑土,研究了有机物料施用量对土壤CO2排放速率的影响.研究表明,施用有机物料以后CO2排放速率明显增加,5%和3%处理CO2排放速率增加幅度显著高于2%和1%处理.有机碳分解初期CO2排放速率增加较快,波动性大,后期趋于稳定,其相对值大小随有机物料施用量及土壤有机碳含量增加而增加,即6号土>5号土>4号土>1号土.3号土性质与其它土壤样品略有不同,CO2排放速率偏高.

In this paper,the incubating experiments were conducted to study the effects of the organic material amount on CO2 released rate from the soil. Tile experimental results showed that when organic material was applied, the CO2 released rate from soil was obviously increased, and for the treatment of 5 % and 3% ,the increasing range was much higher than that of the treatment of 2% and 1%. The increase of CO2 released rate was fast at the beginning period and the fluctuation was significant too. But at later stage it was stable. The relative value was increasing with the amount of organic material and the soil organic carbon content,namely sample 6 〉 sample 5 〉sample 4 〉 sample 3 〉 sample 2 〉 sample 1. But the value of sample 3 was much higher than the others＇ ,because its physieal and chemical properties were different from the others＇.