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首页> 外文期刊>Polish Journal of Environmental Studies >Conversion of Cropland to Grassland and Forest Mitigates Global Warming Potential in Northeast China
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Conversion of Cropland to Grassland and Forest Mitigates Global Warming Potential in Northeast China

机译：退耕还草还林减轻了东北地区的全球变暖潜力

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In converting cropland to grassland and forest, more carbon is sequestered in grassland soil and forest biomass, but the mitigation of global warming potential (GWP) is not clear. In this study, we use the lon-gterm conversion from cropland to grassland (28 y) and forest (14 y) to comprehensively assess the impact on GWP of soil carbon (C), nitrogen (N), CO2 and N2O emissions. The results showed that compared to the original cropland, conversion to grassland increased soil C content by 51.1%, soil N content by 28.4%, soil C stock (SCS) by four times, CO2 emission by 17%, and N2O emission by 40%; soil N stock (SNS) decreased by half. The corresponding values after afforestation were 7.2%, 5.2%, three times, 3%, -80%, and half, respectively. Overall GWP in the cropland system was calculated using the fuel used for farming production, the change in soil C, and N2O emissions. Due to large C sequestration, the GWP of conversion to grassland (-1667 kg CO2-C equivalent ha(-1).y(-1)) and forest (-324 kg CO2-C equivalent ha(-1).y(-1)) were significantly lower than the cropland system (755 kg CO2-C equivalent ha(-1).y(-1)). The relationship between GWP and greenhouse gas, between GWP and the change of total C and N, suggest that in rain-fed agricultural systems in northeast China, the conversion from cropland to grassland and forest can mitigate GWP through changing CO2 and N2O emissions.
机译：在将农田转化为草地和森林时，更多的碳被固存在草地土壤和森林生物量中，但是减轻全球变暖潜能值（GWP）尚不清楚。在这项研究中，我们使用从耕地到草地（28年）和森林（14年）的长期转换来全面评估土壤碳（C），氮（N），CO2和N2O排放对GWP的影响。结果表明，与原始农田相比，改种草地可使土壤碳含量增加51.1％，土壤氮含量增加28.4％，土壤碳储量（SCS）增加四倍，CO2排放量增加17％，N2O排放量增加40％ ;土壤氮素存量下降了一半。绿化后的相应值分别为7.2％，5.2％，三倍，3％，-80％和一半。农田系统中的总全球升温潜能值是使用用于农业生产的燃料，土壤碳的变化和一氧化二氮的排放量来计算的。由于大量的C固存，转化为草地（-1667 kg CO2-C当量ha（-1）.y（-1））和森林（-324 kg CO2-C当量ha（-1）.y（ -1））显着低于农田系统（755 kg CO2-C当量ha（-1）.y（-1））。全球升温潜能值与温室气体之间的关系，全球升温潜能值与总碳和氮的变化之间的关系表明，在东北雨水农业系统中，从农田向草地和森林的转化可以通过改变二氧化碳和一氧化二氮的排放来缓解全球升温潜能值。

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