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本研究选用ASI法对山西褐土41个、河南潮土73个、辽宁棕壤43个、黑龙江黑土69个土样进行了土壤硝态N(ASI-NO3--N)、铵态N(ASI-NH4+-N)、碱溶有机质(ASI-OM)的测定,同时用常规方法测定了碱解N和有机质。并对测定值进行了相关性分析。同时选取土壤进行盆栽试验以验证ASI法测定值与植物吸N量的相关性。结果表明:四类土壤ASI-NO3--N与碱解N测定结果达到了极显著相关(褐土r=0.89**,潮土r=0.79**,棕壤r=0.90**,r=0.47**),四类土壤ASI-OM与常规方法有机质测定结果均达到了极显著正相关(褐土r=0.92**,潮土r=0.88**,棕壤r=0.93**,黑土r=0.96**),ASI-NH4+-N与碱解N测定结果也均达到了极显著正相关(褐土r=0.76**,潮土r=0.64**,棕壤r=0.97**,黑土r=0.61**)。褐土、棕壤土壤ASI-NO3--N含量与植物吸N量呈极显著正相关(P<0.01),潮土、黑土土壤ASI-NO3--N含量与植物吸N量呈显著正相关(P<0.05)。褐土、棕壤土壤ASI-NH4+-N含量与植物吸N量呈显著正相关(P<0.05),潮土、黑土土壤ASI-NH4+-N含量与植物吸N量相关性不显著(P>0.05)。除褐土土壤ASI-OM含量与植物吸N量呈显著正相关外(P<0.05),潮土、棕壤、黑土土壤ASI-OM含量与植物吸N量相关性不显著(P>0.05)。
In this study, ASI method was used to determine the soil nitrate nitrogen (ASI-NO3 - N), ammonium nitrogen N (ASI-NO3 - N) in 41 soil samples from Shanxi, 73 soil samples from Henan, 43 brown soil samples from Liaoning, 69 soil samples from black soil samples from Heilongjiang Province. -NH4 + -N) and alkali-soluble organic matter (ASI-OM), and the alkaline solution of N and organic matter were determined by the conventional method. And the correlation analysis of the measured value. At the same time, the soil was selected for pot experiment to verify the correlation between the measured value of ASI and N uptake by plants. The results showed that ASI-NO3 - N and alkalinity N in four soils reached a very significant correlation (r = 0.89 **, r = 0.79 **, r = 0.90 **, r = 0.47 **). There was a significant positive correlation between ASI-OM and the results of conventional methods (r = 0.92 ** for cinnamon soil, r = 0.88 ** for rye soil, r = 0.93 ** for rye soil, r = 0.96 **). The results of ASI-NH4 + -N and alkalinity N also reached significant positive correlations (r = 0.76 ** for cinnamon soil, r = 0.64 ** for tide soil and r = 0.97 ** for rye soil) , Black soil r = 0.61 **). Soil ASI-NO3 - N content in brown soil and brown soil had a significant positive correlation (P <0.01) with soil N uptake, while ASI-NO3 - N content in soil and black soil had a significant positive correlation with soil N uptake (P <0.05). The contents of ASI-NH4 + -N in brown soil and brown soil were significantly and positively correlated with N uptake by plants (P <0.05), but the correlation between ASI-NH4 + -N content in soil and black soil was not significant (P> 0.05). Soil ASI-OM content was not significantly correlated with N uptake (P> 0.05) except soil ASI-OM content was positively correlated with plant N uptake (P <0.05) .