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为湿地保护和减缓全球气候变化政策的制定提供科学依据,根据对黑龙江省三江平原不同类型和不同开垦年限的湿地土壤有机碳含量、土壤视密度、土层厚度和面积的测量结果,估算土壤碳储量及农业开发50a以来的碳储量变化。对不同土壤类型碳密度随时间的变化,用回归分析的方法,建立土壤碳密度变化模型。结果显示,湿地开发初期20a碳密度降低很快,之后逐渐趋于平稳。三江平原的湿地土壤是一个重要的有机碳库,其有机碳储量为621Mt,该区湿地土壤碳储量随耕地面积的增加而减少。人类活动导致的湿地丧失和退化、水土流失和不合理的耕作措施等是土壤碳储量减少的主要原因。
It provides a scientific basis for wetland protection and slowing down the formulation of global climate change policy. Based on the measurement results of soil organic carbon content, soil apparent density, soil layer thickness and area in wetlands with different types and years of reclamation in Sanjiang Plain of Heilongjiang Province, soil carbon Reserves and Carbon Storage Changes since Agricultural Development 50a. With the change of carbon density of different soil types with time, a regression model was established to establish the model of soil carbon density change. The results showed that the initial carbon dioxide concentration decreased rapidly in the early stage of wetland development, then gradually stabilized. The wetland soil in the Sanjiang Plain is an important organic carbon pool with an organic carbon storage of 621Mt. The soil carbon storage in the wetland decreased with the increase of cultivated land area. Loss and degradation of wetlands caused by human activities, soil erosion and irrational tillage measures are the main reasons for the reduction of soil carbon stocks.