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研究了1982—2012年长期不同施肥下红壤性水稻土土壤有机碳含量变化、固碳趋势及外源碳输入对土壤固碳的贡献.结果表明:施肥能提高土壤有机碳含量,连续30年不同施肥后,各施肥处理土壤有机碳含量趋于稳定,有机无机配施的土壤有机碳含量为21.02~21.24 g·kg-1,增加速率为0.41~0.59 g·kg-1·a-1,单施化肥的土壤有机碳含量为15.48g·kg-1.各有机无机肥配施处理土壤的平均有机碳储量为43.61~48.43 t C·hm-2,历年平均土壤有机碳储量显著大于单施化肥处理.土壤固碳速率与年均投入碳量呈显著指数正相关.本试验条件下,每年需要增加外源有机碳为0.12 t C·hm-2才能维持土壤有机碳的平衡.
The effects of long-term different fertilization on soil organic carbon content, carbon sequestration and carbon sequestration in red paddy soil from 1982 to 2012 were studied.The results showed that fertilization could increase soil organic carbon content for 30 years After fertilization, the soil organic carbon content of all fertilization treatments stabilized. The content of soil organic carbon was 21.02 ~ 21.24 g · kg-1 with the rate of 0.41 ~ 0.59 g · kg-1 · a-1 The soil organic carbon content of chemical fertilizers was 15.48g · kg-1. The average SOC storage of organic-inorganic fertilizers was 43.61 ~ 48.43 t C · hm-2, and the average soil organic carbon storage over the years was significantly higher than that of single chemical fertilizers The soil carbon sequestration rate was significantly and exponentially correlated with the annual average carbon input.Under this experimental condition, the annual increase of exogenous organic carbon was 0.12 t C · hm-2 to maintain the balance of soil organic carbon.