中文摘要：

以往在生态足迹的研究中,囿于简化模型与耕地碳汇计算方法的限制,耕地碳汇功能常常被忽视。该研究尝试基于统计数据和非经济生物量来计算省级尺度的耕地碳汇。以我国国家统计局公布的24种主要作物经济产量统计数据为基础,用作物经济系数、根茬系数计算出非经济生物量。GIS分析显示,我国省域耕地碳汇量与耕地碳汇效率在空间上存在明显差异。其中,耕地碳汇量呈现东西部偏小、中部偏大的空间差异性;耕地固碳效率呈现东西低、中间高,南方大于北方的总体趋势。由于耕地碳汇量巨大,测算时应当考虑耕地的碳汇功能。影响耕地碳汇功能发挥的因素多样,且地区差异较大,应分区域制定差异化引导政策,从而促进耕地碳汇功能的充分发挥。

英文摘要：

In previous studies in terms of ecological footprint models, the carbon sink of arable land was usually neglected in many occasions, for simphfication of model or lack of appropriate calculation method. Thus, this paper proposed an exploratory method to delineate the spatial pattern of arable land carbon sinks, based on statistical data and non-economic biomass. Firstly, based on the corresponding production statistics obtained from state statistics bureau, economic coefficient of crops（The ratio of output of main product to by - product of the crops） and stubble coefficient（ The ratio of stubble yield to economic yield） were used to calculate the yield of straw and stubble of crops, namely, non - economic biomass. Non - economic biomass was the foundation of arable land carbon sink. It was usually used as fertilizer, discard and shuffle, non- collection or indigested animal ex- creta, and finally blended into the soil in the way of national degradation. China is a vast country, and varied on productive forces, cultural customs in different regions. Therefore the arable land carbon sink of each provincial area was calculated in consideration of different ways of utilization, the efficiency of natural degradation and digestibility. Through GIS analysis, significant differences were found among provincial areas in terms of amount and efficiency of arable land carbon sink. The amount was high in east and west, low in middle. The efficiency was high in east and west, low in middle and higher in south than north. Above all, the important role of arable land should be taken into consideration in calculation of the carbon sink due to its huge amount. Besides, considered the multiplicity of influence factor and variations in geography, differentiation intervention strategies should be encouraged to make to promote the role of arable land in carbon sink.