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在农田生态系统中,植物通过光合作用固定大气中的CO2,同时土壤微生物活动不断的分解土壤有机质,使其一部分成为土壤腐殖质,另一部分则以CO2形式被释放到大气中,因此,土壤中有机碳储量是进入土壤的植物残体量以及在土壤微生物作用下分解损失量相互作用的结果。这个过程受到气候条件、土壤性质、土地利用方式、耕作制度等人为和自然因素的综合影响。而黑土作为重要的农田土壤,无论是农业生产,还是碳素平衡都起着重要的作用,为了有效管理土壤有机碳库的储量,使土壤有机碳成为大气CO2积累的库而不是排放的源,本试验通过培育东北黑土,设置不同有机质含量和温度条件,测定CO2排放速率的变化,明确单一因素温度对不同有机质含量土壤CO2排放速率的影响。
In farmland ecosystems, photosynthesis plants in the atmosphere fixed CO2, while soil microbial activities continue to decompose the soil organic matter, make it part of the soil humus, the other part of the release of CO2 into the atmosphere, therefore, the organic Carbon stocks are the result of the amount of plant debris that enters the soil and the amount of decomposition that breaks down under the action of soil microorganisms. This process is influenced by a combination of human and natural factors, such as climatic conditions, soil properties, land-use patterns and farming systems. As an important farmland soil, black soil plays an important role in both agricultural production and carbon balance. In order to effectively manage the reserves of soil organic carbon pool and make soil organic carbon a reservoir of atmospheric CO2 rather than a source of emissions, In this experiment, the change of CO2 emission rate was determined by cultivating black soil in northeast China and setting different organic matter content and temperature conditions. The effect of single factor temperature on CO2 emission rate of soil with different organic matter content was clarified.