黑龙江省三江平原湿地土壤碳储量变化

Wetland soils carbon stock in the Sanjiang plain

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。

The variation of the wetland soil carbon stock in the Sanjiang Plain in Heilongjiang province was estimated used data for the soil carbon content, bulk density, depth, and land area in the past 50 years. The results will be used to support policy decisions related to wetland protection and global climate change and to analyze the influence of agricultural development on soil carbon stock. The soil carbon density change model is based on regression analysis of the carbon densities of different soils. The result shows that wetland soils in the Sanjiang plain are an important source of carbon, with a total organic carbon stock of 621 Mt. The wetland soils carbon stock decreases with the increase of cropland area increases. The soil carbon density decreased rapidly in the first 20 years, due to wetland loss and degradation, soil loss, and unreasonable cultivation.