关键词: 碳足迹, 碳承载力, 生态补偿标准

Abstract: Improving plough layer structuring is an effective approach to solve the problems of shallow, compacted and lacked plough layer, which is of great significance to reasonable plough layer construction and soil health development of drylands in north China. To examine the effects of plough layer structuring of rainfed croplands, we designed an experiment with four treatments including up loose and down compaction plough layer (ULDC, as a control), furrow loose and ridge compaction plough layer (FLRC), all loose plough layer (AL) and all compaction plough layer (AC) in a longterm experimental station in Fuxin of Liaoning Province from 2015 to 2016. We measured nine parameters, including yield, water use efficiency, biomass, leaf area index, photosynthetic rate, soil bulk density, soil threephase structure distance, root weight density, root surface area density. According to the comprehensive evaluation function of vectors, comprehensive evaluation values of FLRC, AL, AC and ULDC were 0.8222, 0.7174, 0.6903 and 0.6455, respectively. After comprehensive analyses, FLRC is the best structure of the plough layer in the drylands of northern China. Our results provide a theoretical and technical reference for establishing a scientific soil tillage system and soil sustainable development in the region.

Key words: ecological compensation criterion, carbon footprint, carbon carrying capacity.