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通过长期施肥定位试验,分析了石灰性潮土连续30年施肥处理下土壤pH、碳酸钙和活性碳酸钙含量以及土壤酸碱缓冲容量的变化.结果表明:连续30年施肥处理导致石灰性潮土0～20cm耕层土壤酸化加速,各施肥处理的耕层土壤pH降低0.41～0.70;各施肥处理的耕层土壤酸碱缓冲容量为15.82～21.96cmol·kg-1,单施氮肥明显降低了土壤酸碱缓冲容量,而增施有机肥可显著提高土壤酸碱缓冲容量.土壤酸碱缓冲容量与土壤碳酸钙和活性碳酸钙含量呈显著正相关,与土壤有机质含量和阳离子交换量的相关性不显著,长期不同施肥处理下石灰性潮土仍处于碳酸钙初级缓冲体系,盐基离子和有机质对土壤酸碱缓冲体系的影响较小.0～40cm土层的土壤碳酸钙和活性碳酸钙含量均高于40～80cm土层.与土壤碳酸钙相比,土壤活性碳酸钙更能敏感反映土壤基本理化性状的变化,碳酸钙缓冲体系还可以进一步细分为土壤活性碳酸钙缓冲体系.
Through long-term fertilization experiment, the changes of soil pH, calcium carbonate and activated calcium carbonate content and acid-base buffering capacity under 30 years fertilization of calcareous alluvial soil were analyzed. The results showed that 30 years of fertilization resulted in calcareous soil Soil acidification of topsoil accelerated at 0 ~ 20cm, and the pH of topsoil decreased by 0.41 ~ 0.70 in each fertilization. The acid-base buffer capacity of topsoil was 15.82 ~ 21.96cmol · kg-1 in all fertilization treatments. Acid-base buffer capacity, while adding organic manure significantly increased soil acid-base buffer capacity.The soil acid-base buffer capacity and soil calcium carbonate and active calcium carbonate content was significantly positively correlated with the soil organic matter content and cation exchange capacity of the correlation is not Significantly, the calcareous alluvial soils under different long-term fertilization treatments were still in the primary calcium carbonate buffer system, and the effects of salt-based ions and organic matter on the soil acid-base buffer system were insignificant. The contents of soil calcium carbonate and activated calcium carbonate in 0 ~ 40cm soil layer Higher than 40 ~ 80cm soil layer.Compared with soil calcium carbonate, soil active calcium carbonate is more sensitive to reflect changes in soil physical and chemical properties, calcium carbonate buffer system can also enter Step by step into the soil active calcium carbonate buffer system.