Composition Of Organo-mineral Complex In The Northeast Phaeozem And Its Relationship With Soil Properties

On the systemic study of composition of organo-mineral complex in the northeast phaeozem, relationship between composition of organo-mineral complex and soil properties, effect of different tillage and fertilizer application conditions on the composition of organo-mineral and soil properties were studied, using the phaeozem in the middle of Heilongjiang and Jilin province.Results show that, in composition of organo-mineral complex in the northeast phaeozem, GI occupied 55.01% on average, was major part, and then 60,62. The order of organo-mineral complex content in unitary weight soil was Gi>Go>G2. Total weight of complex was more than half of soil weight in unitary weight, reached 542.82g/kg. Among three groups of complex, organic carbon content in 62 was the most, 57.31g/kg on average, that in GI is more than in GO slightly, with the content of 25.47g/kg and 23.86g/kg, respectively. The order of contributive ratio of organic carbon in three groups complex was Gi>Go>G2. The contributive ratio of organic carbon in each group complex to organic carbon in soil was decided by organic carbon content of itself, but was mainly decided by absolute content of complex.With altitude changing, content of organo-mineral of cultivated horizon in northeast phaeozem changed regularly. Analysis showed that content of GI and 62 was inclined to decrease from north to south and positively related to altitude, respectively, which their correlation coefficient was 0.719 and 0.693, respectively; content of 61+62 and 60+61+62 was also inclined to decrease from north to south and was positively related to altitude, respectively, which their correlation coefficient was 0.815 and 0.835, respectively.Composition characteristic of each group organo-mineral complex of each group was by signified and compared means of trigonometric coordinates. Meanwhile, considered relative content of three groups of complex, it reflected actual condition better that ratio of two groups of complex. So it could be regarded as reference on soil geneses and soil classification and soil fertility degeneration.There was obvious dependence relationship between organo-mineral complex content and soil physical and chemical property. Analysis showed that soil pH value was positively related to the content of GI and Go+Gi+Ga significantly; soil buffer capacity was positively related to the content of GI and Go+Gj+Ga; each of organic carbon, total N and available P was significant positively and positively related to the content of G2 and G0+Gi+G2, respectively; available K was positively related to the content of GI and Go+Gi+Gi significantly.Pingboshuanghang and NPK + organic fertilizer could promote formation of organo-mineral complex, increase soil aggregated structure, decrease soil bulk density, relax solum, decrease soil porosity, raise soil permeability, improve soil structure and holding-water capability, create better soil biology condition for growth of crop, andcoordinate water, fertilizer, air and heat etc.