| Korla fragrant pear is one of the main pear varieties to Xin jiang,and its play very important role in the development of rural economy.The blind application of excessive chemical fertilizer and inappropriate orchard management in the production process of fragrant pear have effected the sustainable development of fragrant pear industry.so this study selected Korla fragrant pear garden to conduct fertilization experiment,and were designed CK,NPK,NPK+BIO and BIO fertilization treatments.Preliminary investigate on the effects of bio-organic fertilizer on the soil physical and chemical properties,aggregate stability,aggregate active organic carbon fraction and nutrients in Korla pear orchard.The results of the research as follows:(1)Under the treatment of chemical fertilizer(NPK),chemical fertilizer combined with biological organic fertilizer(NPK+BIO)and single application of biological organic fertilizer(BIO),pear orchard in the0～20 cm,20～40 cm and 40～60 cm soil layers were mainly 0.25～2 mm and 0.053～0.25 mm diameter of water-stable aggregates.In addition,the NPK+BIO and BIO fertilization treatments improved the soil water content,total porosity,mean weight diameter(MWD),geometric mean diameter(GMD)and >0.25 mm aggregate content,and the effect of reducing soil bulk density,specific gravity of soil and 0.053～0.25 mm aggregate propertion was better than that of NPK fertilization treatment.(2)Each fertilization treatment increased the contents of organic carbon and active organic carbon components in different soil layers of Korla pear orchard;At the same time,the content of soil organic carbon and active organic carbon decreased with the deepening of soil layer.Compared with the no-fertilized control(CK),the NPK+BIO fertilization treatment significantly rising the SOC and active organic carbon content in the 0～20 cm,20～40 cm and 40～60 cm soil layer,and the proportion of readily oxidized organic carbon(ROOC)and acid-hydrolyzed organic carbon Ⅰ(AHC I)in total organic carbon was the highest,34.87%～43.98% and 27.70%～39.40%;in addition,the total soil organic carbon content has a significant positive correlation with the hot water extractable carbon(HWC),acid-hydrolyzed organic carbon components I,II(AHCI,AHCII)and readily oxidized organic carbon(ROOC).(3)Under the different fertilization treatments,the content of active organic carbon in >2 mm and0.25～2 mm water-stable aggregates in 0～20 cm,20～40 cm and 40～60 cm soil layers of pear orchard was higher,and the content of 0.053～0.25 mm and <0.053 mm size aggregates was lower;At the same time,the active organic carbon content of aggregates at different particle sizes decreased with the increase of soil depth.Compared with the no-fertilized control(CK),fertilization treatment of NPK+BIO significantly increased DOC,HWC,AHC I,AHC II and ROOC contents of >2 mm aggregates in 0～20 cm soil layer of pear orchard.In addition,NPK+BIO and BIO fertilization treatments increased the contribution rates of >2mm water-stable aggregates HWC,AHC I and ROOC in 0～20,20～40 and 40～60 cm soil layer of pear orchard soil,and reduced the contribution rates of 0.053～0.25 mm aggregates HWC,AHC I and AHC II.(4)In the 0～60 cm soil layer of pear orchard,the organic matter and nutrient content of whole soil and water-stable aggregates at each size decreased with the increase of soil depth,and the NPK+BIO fertilization treatment significantly rising the whole soil and >2 mm,0.25～2 mm large aggregates size of organic matter,total nutrient and available nutrient content;in addition,The nutrient contribution rate of0.25～2 mm water-stable agglomerate was the highest,followed by >2 mm and 0.053～0.25 mm size aggregates,and the nutrient contribution rate of <0.053 mm size aggregates is the lowest.At the same time,NPK+BIO and BIO fertilization treatments increased the contribution rates of >2 mm water-stable aggregates OM,TN,TP,TK and AK in 0～20 cm,20～40 cm and 40～60 cm soil layer of pear orchard soil,and reduced the contribution rates of 0.053～0.25 mm aggregates TN,TP,AP and TK. |
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