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采用超声波分散、颗粒大小分组法研究不同土地利用方式下黑土有机无机复合体组成及有机碳的分布特征。不同土地利用方式下黑土均以细砂级复合体为主,有机碳含量随粒径增加而减少,C/N比随粒径增加而增加。NP和NPM处理比NF处理土壤<20μm粒级复合体含量减少,>20μm复合体含量增加;草地与裸地相比<20μm粒级复合体含量减少,>20μm复合体含量增加。土地利用方式不同,土壤固碳的机制是不同的,草地生态系统的土壤固碳潜力高于农田土壤。施肥和有机质的输入使土壤各粒级复合体中的有机碳含量增加;使>20μm粒级复合体固持的SOC量比例增加,表明在土壤有机质含量增加的情况下,有机质有向大粒级复合体的积累增加。
Using ultrasonic dispersion, particle size grouping method to study the distribution characteristics of organic-inorganic composite and organic carbon in black soil under different land use patterns. Black soil is dominated by fine sand-gravel under different land use patterns. Organic carbon content decreases with increasing grain size. C / N ratio increases with increasing grain size. NP and NPM decreased the content of <20μm fractional complex and increased the content of> 20μm complex in NF treated soil; the content of <20μm fractional complex decreased and the content of> 20μm complex increased in grassland and bare land. Different land use patterns lead to different mechanisms of soil carbon sequestration. Grassland ecosystem has higher soil carbon sequestration potential than farmland soil. The input of fertilization and organic matter increased the content of organic carbon in each grain-size complex and the proportion of SOC retained in> 20 μm grain-size complex increased, indicating that under the condition of increasing soil organic matter content, The accumulation increased.