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碳氮比(以下简称C/N)是土壤的重要化学性质,其比值因当地的水热条件及耕作管理水平而异,我国自然植被下主要土类C/N变幅6.2～20.9,但在一定自然环境和农业生产水平下,平原地区C/N比的变幅较小,一般可视为一个常数。C/N是土壤形成过程中一定生物气候条件的综合反映,具有明显的地带性。它反映有机质的质量和数量,氮素的富瘠和有效程度。反映土壤的耕作、熟化程度,在一定范围内可作为养分肥力的指标。现就碳氮比变化试将上海土壤养分状况分析如下:
C / N ratio is an important chemical property of soil. The ratio of C / N ratio varies with local hydrothermal conditions and tillage management level. The C / N ratio of major soil types in China’s natural vegetation ranged from 6.2 to 20.9. However, Under certain natural environment and agricultural production level, the amplitude of C / N ratio in the plain area is small and generally can be regarded as a constant. C / N is a comprehensive reflection of certain biological and climatic conditions in the process of soil formation, with obvious zonality. It reflects the quality and quantity of organic matter, the fertility and effectiveness of nitrogen. Reflect the soil cultivation, maturity, within a certain range can be used as an indicator of nutrient fertility. Changes in carbon and nitrogen will now test the status of soil nutrients in Shanghai are as follows: