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通过对川中丘陵区29个乡镇500个土样的有机质和全氮的检测发现,川中丘陵区有机质含量为7.48～43.05 g/kg,平均为18.53 g/kg,主要处于Ⅱ级丰富水平和Ⅲ级中等水平,Ⅱ级和Ⅲ级所占比例分别为63.4%和27.4%。全氮含量为0.55～2.55g/kg,平均为1.27 g/kg,含量主要处于Ⅱ、Ⅲ和Ⅳ级,各级所占比例分别为49.8%、21.6%和22.4%。土壤有机质与全氮显著正相关,相关系数为0.9479,线性回归方程为TN=0.053OM+0.29,换算系数0.046～0.103,平均0.070。
The results showed that the content of organic matter and total nitrogen in 500 samples from 29 towns and townships in central Sichuan hilly region was 7.48 ~ 43.05 g / kg with an average of 18.53 g / kg, which was mainly at Ⅱ level and Ⅲ level The average level, grade Ⅱ and Ⅲ accounted for 63.4% and 27.4% respectively. Total nitrogen content was 0.55 ~ 2.55g / kg, with an average of 1.27g / kg. The content of total nitrogen was in grades Ⅱ, Ⅲ and Ⅳ, with the proportions of 49.8%, 21.6% and 22.4% at all levels. The soil organic matter was positively correlated with total nitrogen, the correlation coefficient was 0.9479, the linear regression equation was TN = 0.053OM + 0.29, and the conversion coefficient was 0.046 ~ 0.103 with an average of 0.070.