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研究土壤活性有机碳组分和水稳定性团聚体的变化规律,对于评价长期不同施肥处理对绿洲农田土壤环境和区域碳循环具有重要意义。本文选取绿洲农田,设置长期撂荒(20 a)、无施肥、单施全量化肥和2种有机无机配施处理,测定不同处理土壤活性碳组分和水稳定性团聚体含量分布特征。结果表明,在表层(0~20 cm),开垦有利于颗粒碳、可溶性有机碳、可溶性无机碳和水稳定性大团聚体(>0.25 mm)的累积;与不施肥相比,有机无机配施更有利于活性碳组分累积和水稳定性大团聚体形成和稳定。在相同处理中,表层颗粒碳和水稳定性大团聚体对整个剖面层次累积起主导作用,而表层可溶性有机碳和无机碳与之相反。活性碳组分与团聚体稳定性呈显著正相关。
Studying the variation of soil active organic carbon and water-stable aggregates is of great significance for evaluating long-term different fertilization treatments on soil environment and regional carbon cycle in oasis farmland. In this paper, oasis farmland was selected to set up long-term abandoned land (20 a), no fertilization, single chemical fertilizer and two organic-inorganic fertilizers to determine the distribution of soil active carbon and water-stable aggregates. The results showed that reclamation was beneficial to the accumulation of particulate carbon, soluble organic carbon, soluble inorganic carbon and water-stable macroaggregates (> 0.25 mm) in the surface layer (0-20 cm). Compared with non-fertilization, More conducive to the accumulation of activated carbon components and water-stable large aggregates formation and stability. In the same treatment, surface granule carbon and water-stable large aggregates played a dominant role in the accumulation of the entire profile, while the surface dissolved organic carbon and inorganic carbon were the opposite. There was a significant positive correlation between the active carbon components and the stability of aggregates.